Polygonum aviculare was observed to spread rapidly into heavy stands ofCynodon dactylon (L.) Pers... more Polygonum aviculare was observed to spread rapidly into heavy stands ofCynodon dactylon (L.) Pers. resulting in death of the latter. This indicated a strong interference againstCynodon dactylon. Measurements of selected soil minerals and physical factors indicated that competition was probably not the chief cause of that interference. Soil collected under deadPolygonum was very inhibitory to all test species exceptSporobolus pyramidatus (Lam.) Hitchc., suggesting the presence of inhibitory compounds. Tops and roots ofPolygonum, root exudates, and leachate of the tops inhibited seed germination and seedling growth of most test species. Therefore, allelopathy apeared to be the dominant component of the interference, with competition probably accentuating its effects.Polygonum aviculare was inhibitory toGossypium barbadense L. andSorghum bicolor (L.) Moench, indicating that allelopathy is an important component of the interference byPolygonum against crop yields.
Polygonum aviculare was observed to spread rapidly into heavy stands ofCynodon dactylon (L.) Pers... more Polygonum aviculare was observed to spread rapidly into heavy stands ofCynodon dactylon (L.) Pers. resulting in death of the latter. This indicated a strong interference againstCynodon dactylon. Measurements of selected soil minerals and physical factors indicated that competition was probably not the chief cause of that interference. Soil collected under deadPolygonum was very inhibitory to all test species exceptSporobolus pyramidatus (Lam.) Hitchc., suggesting the presence of inhibitory compounds. Tops and roots ofPolygonum, root exudates, and leachate of the tops inhibited seed germination and seedling growth of most test species. Therefore, allelopathy apeared to be the dominant component of the interference, with competition probably accentuating its effects.Polygonum aviculare was inhibitory toGossypium barbadense L. andSorghum bicolor (L.) Moench, indicating that allelopathy is an important component of the interference byPolygonum against crop yields.
The effect of root exudates of fifty Sorghum genotypes on seed germination and seedling growth of... more The effect of root exudates of fifty Sorghum genotypes on seed germination and seedling growth of millet were studied in vitro. The fifty genotypes were divided into four groups according to their effect on percentage reduction in root and shoot and whole plant average lengths of millet seedling growth. The first group caused slight stimulation, the second slight inhibition, the third gave limited inhibition and the fourth caused high inhibition. In seedling growth. Five genotypes of sorghum were selected, one from group two and four from group four. These five genotypes were cultured in the field in Autumn 2007 and at the end of the season plants were removed, dried and grind. Three concentrations of each of these genotypes powder were prepared, in addition to the control treatment, (0.0, 3.0, 6.0 and 9.0) g/kg soil to study their effects on the growth of Amaranthus retroflexus which cultured in pots and kept in experimental field. Data on number of leaves, lengths of shoot and roo...
During the past three decades, extensive work in the field of allelopathy has been done. Rice (19... more During the past three decades, extensive work in the field of allelopathy has been done. Rice (1984) reviewed most of the research works associated with the role of allelopathy in agricultural and Ecol.ogical ecosystems. This field of research has drawn the attention of several scientists since there is a strong feeling that allelopathic research can be applied to so many current problems such as weed control (Putnam et al., 1983; Putnam and Duke, 1974) and regulation of nitrogen cycle in soil (Alsaadawi, 1987; Alsaadawi and Rice, 1982a, Alsaadawi and Rice, 1982b; Alsaadawi et al., 1983; Putnam and Duke, 1974). Accordingly a large volume of research work has been done and published in various approaches of allelopathy.
... Ibrahim S. Alsaadawi 1 , Majid HS Al-Ekelle 2 and Mageed K. Al-Hamzawi 2. ... For control, si... more ... Ibrahim S. Alsaadawi 1 , Majid HS Al-Ekelle 2 and Mageed K. Al-Hamzawi 2. ... For control, similar rates of peat moss were added to maintain consistency of soil organic matter (Alsaadawi and Rice 1982 ).Twenty-five seeds of Lolium tenulintum weed were planted in each pot. ...
The interactive effects of citrus root residues and soil fungi on citrus replant problems were in... more The interactive effects of citrus root residues and soil fungi on citrus replant problems were investigated. The results indicated that incorporation of citrus root residues in combination with the pathogenic fungiPhytophthora citrophthora, Pythium aphanidermatum andFusarium solani in soil caused more reduction to sour orange growth than did the root residues alone. Subsequent experiments showed that extracts of different parts of sour orange and leachates of some soil fungi increased the disease index of citrus roots grownin vitro. The citrus extracts did not affect growth of the test fungi.Thus, it appears that allelopathic compounds of plant and microbial origins build up in old citrus soil and may act as predisposal agents for the infection of citrus roots by soil pathogens.
Field experiment was conducted during the growing season of 2015/16 to test the allelopathic effe... more Field experiment was conducted during the growing season of 2015/16 to test the allelopathic effect of sorghum mulch on yield of faba bean and companion weeds. Plots (1.5 m × 2 m) were covered by dry plant material of sorghum at 5 and 10 t/ha. Plots without sorghum mulch were used as control. Seeds of faba bean were sown in rows at the beginning of October keeping space 40 cm between rows and 20 cm between plants. Weed density and weed dry biomass were recorded at two months after sowing. Yield components of faba bean were measured at the end of the growing season using standard procedures. The experiment was conducted in randomized complete block design with four replications. Sorghum mulch at 5 and 10 t/ha had significantly inhibited weed density by 62 and 78% relative to control and weed biomass by 64 and 90% compared to control, respectively. Plots with sorghum mulch at 5 and 10 t/ha provided higher broad bean above ground biomass (2.71 and 3.05 t/ha, respectively) which were 43...
Laboratory tests were conducted to detect the differential allelopathic potential of two sorghum ... more Laboratory tests were conducted to detect the differential allelopathic potential of two sorghum (Sorghum bicolor) cultivars (Enqath and Rabeh) residues. Chemical analysis of residues indicated that total phenolics were found to be higher in Enqath than in Rabeh plants suggesting the superiority of the allelopathic potential of the first cultivar over the second one against weeds. Results indicated that total phenolics were two folds in shoot than in root of both cultivars. These compounds appeared to be higher in Enqath shoot and root (1.60 and 0.80 mg/g, respectively) than in Rabeh shoot and root (1.2 and 0.50 mg/g, respectively). The increments in total phenolics in root and shoot of Enqath were clearly reflected on the increase of total phenolics in the whole plant reaching about 2.40 mg/g compared to Rabeh (1.70 mg/g). Chemical analysis by high performance liquid chromatography (HPLC) revealed the presence of seven allelochemicals namely ferulic, p-coumaric, gallic, vanillic, s...
Field trial was conducted with the aim of utilizing allelopathic crop residues to reduce the use ... more Field trial was conducted with the aim of utilizing allelopathic crop residues to reduce the use of synthetic herbicides in broad bean (Vicia faba) fields. Sunflower residue at 600 and 1,400 g m-2 and Treflan (trifluralin) at 50, 75 and 100% of recommended dose were incorporated into the soil alone or in combination with each other. Untreated plots were maintained as a control. Herbicide application in plots amended with sunflower residue had the least total weed count and biomass, which was even better than herbicide used alone. Integration of recommended dose of Treflan with sunflower residue at 1,400 g m-² produced maximum (987.5 g m-2) aboveground biomass of broad bean, which was 74 and 36% higher than control and recommended herbicide dose applied alone, respectively. Combination of herbicide and sunflower residue appeared to better enhance pod number and yield per unit area than herbicide alone. Application of 50% dose of Treflan in plots amended with sunflower residue resulte...
A field experiment was conducted at two sites (Baghdad and Wasit Governorates) to evaluate ... more A field experiment was conducted at two sites (Baghdad and Wasit Governorates) to evaluate the effects of allelopathic corn residues applied as soil incorporation or mulch, alone and in combination with reduced (50% of recommended dose) rate of trifluralin herbicide on weeds growth and mung bean yield. Conventional soil tillage and zero soil tillage treatments with corn residues were performed, while 50% dose and full dose of trifluralin only (without residues) treatments were included for comparison. Soil incorporation and mulch of corn residues reduced weed density and dry weight biomass and improved yield and yield components of mung bean in both sites. Mulch application was more effective than soil incorporation for weed control. However, the reduction in weed growth and the increase in mung bean yield were below the levels achieved by the label dose of herbicide. Application of 50% dose of trifluralin in plots incorporated or mulched with corn residues reduced weeds and...
Field trial was conducted in Research Field equipped with rainfall transparent shade, Biology Dep... more Field trial was conducted in Research Field equipped with rainfall transparent shade, Biology Department, College of Science, Baghdad University during the growing season of 2012 to test the potential of sorghum water extract in improving yield and yield components of local cultivar of mung bean crop grown under different moisture deficit stresses. The water stresses were applied by irrigated the plots to field capacity and withheld the next irrigation until the soil water deficit reaches 80, 50 and 30% of field capacity for control, mild water stress and higher water stress, respectively. Foliar application of sorghum water extract at 0 ( control), 2.5 and 5% (W/V) was made at preflowering, flowering and fruiting stages. The experiment was conducted in split plot design with four replications for each treatment. The sorghum water extract rates were kept in the sub plot while moisture deficits were assigned as main plot. Results showed that drought stress significantly reduced the a...
A Field experiments were conducted to test the allelopathic potential of sorghum residues alone a... more A Field experiments were conducted to test the allelopathic potential of sorghum residues alone and in combination with half (1.2 L ha-1) of recommended rate of trifluralin herbicide in controlling weeds in cowpea field. For preparation of sorghum residues, grains of sorghum cv. Enkath were grown in lines in plots of 4 × 3.5 m2 keeping 10 cm between grains and 75 cm between lines. Plots of the same area were left without cultivation to be used in the next experiment as a control. At physiological maturity of sorghum crop, the grains were harvested and the plants were left on the plots to dry under sun for 2 weeks. After that, the sorghum residues were incorporated in to the plot soil at 5 T ha-1 and 10 T ha-1. Plots without residues, plots with half dose of trifluralin herbicide, plots with label rate of herbicide and weed free plots (removing weeds weekly). Incorporation of sorghum residues at 5 T ha-1 reduced weed density by 6% of control at 75 days after sowing (DAS), while incor...
Field trial was conducted during the growing season of 2011-2012 at the Research Field, Departmen... more Field trial was conducted during the growing season of 2011-2012 at the Research Field, Department of Biology, College of Science, Baghdad University to test the performance of wheat cv Rabyaa, Latifiya, Al-Iraq, Tummose 2, Abu-Graib 3, IPA 99 and Sham 6 grown under different soil water deficit stresses. Several agronomic and physiological traits and yield and yield components of the test cultivars were determined. The experiment was conducted in split plot design with five replications for each treatment. The cultivars were kept in the sub plot while water stress treatment was assigned as main plot. Water stress was applied by irrigated the plots to the soil field capacity (FC) then withheld next irrigation until the soil moisture of the respective plots depleted to 50 (control), 25 and 15% of FC. Results indicated that the water deficit stress significantly reduced biological yield, grain yield and yield components, plant height and number of tillers. Also, drought significantly r...
Lipase enzyme has attracted a lot of attention in recent years because of its diverse biotechnolo... more Lipase enzyme has attracted a lot of attention in recent years because of its diverse biotechnological applications. The present study was conducted to screen germinated seeds of four crops, namely sunflower (Helianthus annuus), flaxor linseed (Linum usitatissimum ), peanut (Arachis hypogaea ) and castor bean (Ricinus communis), for the activity of their lipases. to the study also included the extraction and purification of lipase from the seeds of the most promising crop using different solvents. The results indicated that the maximum enzymatic activity (0.669 U/ml) was obtained when 0.1 M Tris-HCl buffer extract was used after 3 days of seed germination of all the tested species, as compared to the other test solvents (acetone and water). Sunflower germinated seeds showed the highest lipase activity, which was higher by 159.67, 185.32, and 285.90 % over the activities of castor bean, flax, and peanut seeds, respectively. Among the used ranges of saturation of ammonium sulfate, the...
The promising allelopathic potential of sorghum ( Sorghum bicolor L. (Moench)) opens a fruitful a... more The promising allelopathic potential of sorghum ( Sorghum bicolor L. (Moench)) opens a fruitful area of research to exploit this phenomenon in weed control and regulation of nutrients cycle. The data suggests that sorghum allelopathy can be exploited in different cropping practices (cover crop, smother crop, companion crop, mixing crop and smother crop to control weeds and inhibition of nitrification) and application of its water extracts in fields controls the weeds and enhances the crops productivity. The herbicidal and allelopathic properties of sorgoleone, a compound isolated from root exudates of sorghum and other allelochemicals in sorghum deserve further work to identify the enzymes responsible for the biosynthesis of these compounds and the genes encoding them. Besides there is need to use genetic engineering to manipulate the identified genes in sorghum or in other crops to enhance their ability to suppress the weeds. This review addresses the research on the role of allelo...
Polygonum aviculare was observed to spread rapidly into heavy stands ofCynodon dactylon (L.) Pers... more Polygonum aviculare was observed to spread rapidly into heavy stands ofCynodon dactylon (L.) Pers. resulting in death of the latter. This indicated a strong interference againstCynodon dactylon. Measurements of selected soil minerals and physical factors indicated that competition was probably not the chief cause of that interference. Soil collected under deadPolygonum was very inhibitory to all test species exceptSporobolus pyramidatus (Lam.) Hitchc., suggesting the presence of inhibitory compounds. Tops and roots ofPolygonum, root exudates, and leachate of the tops inhibited seed germination and seedling growth of most test species. Therefore, allelopathy apeared to be the dominant component of the interference, with competition probably accentuating its effects.Polygonum aviculare was inhibitory toGossypium barbadense L. andSorghum bicolor (L.) Moench, indicating that allelopathy is an important component of the interference byPolygonum against crop yields.
Polygonum aviculare was observed to spread rapidly into heavy stands ofCynodon dactylon (L.) Pers... more Polygonum aviculare was observed to spread rapidly into heavy stands ofCynodon dactylon (L.) Pers. resulting in death of the latter. This indicated a strong interference againstCynodon dactylon. Measurements of selected soil minerals and physical factors indicated that competition was probably not the chief cause of that interference. Soil collected under deadPolygonum was very inhibitory to all test species exceptSporobolus pyramidatus (Lam.) Hitchc., suggesting the presence of inhibitory compounds. Tops and roots ofPolygonum, root exudates, and leachate of the tops inhibited seed germination and seedling growth of most test species. Therefore, allelopathy apeared to be the dominant component of the interference, with competition probably accentuating its effects.Polygonum aviculare was inhibitory toGossypium barbadense L. andSorghum bicolor (L.) Moench, indicating that allelopathy is an important component of the interference byPolygonum against crop yields.
The effect of root exudates of fifty Sorghum genotypes on seed germination and seedling growth of... more The effect of root exudates of fifty Sorghum genotypes on seed germination and seedling growth of millet were studied in vitro. The fifty genotypes were divided into four groups according to their effect on percentage reduction in root and shoot and whole plant average lengths of millet seedling growth. The first group caused slight stimulation, the second slight inhibition, the third gave limited inhibition and the fourth caused high inhibition. In seedling growth. Five genotypes of sorghum were selected, one from group two and four from group four. These five genotypes were cultured in the field in Autumn 2007 and at the end of the season plants were removed, dried and grind. Three concentrations of each of these genotypes powder were prepared, in addition to the control treatment, (0.0, 3.0, 6.0 and 9.0) g/kg soil to study their effects on the growth of Amaranthus retroflexus which cultured in pots and kept in experimental field. Data on number of leaves, lengths of shoot and roo...
During the past three decades, extensive work in the field of allelopathy has been done. Rice (19... more During the past three decades, extensive work in the field of allelopathy has been done. Rice (1984) reviewed most of the research works associated with the role of allelopathy in agricultural and Ecol.ogical ecosystems. This field of research has drawn the attention of several scientists since there is a strong feeling that allelopathic research can be applied to so many current problems such as weed control (Putnam et al., 1983; Putnam and Duke, 1974) and regulation of nitrogen cycle in soil (Alsaadawi, 1987; Alsaadawi and Rice, 1982a, Alsaadawi and Rice, 1982b; Alsaadawi et al., 1983; Putnam and Duke, 1974). Accordingly a large volume of research work has been done and published in various approaches of allelopathy.
... Ibrahim S. Alsaadawi 1 , Majid HS Al-Ekelle 2 and Mageed K. Al-Hamzawi 2. ... For control, si... more ... Ibrahim S. Alsaadawi 1 , Majid HS Al-Ekelle 2 and Mageed K. Al-Hamzawi 2. ... For control, similar rates of peat moss were added to maintain consistency of soil organic matter (Alsaadawi and Rice 1982 ).Twenty-five seeds of Lolium tenulintum weed were planted in each pot. ...
The interactive effects of citrus root residues and soil fungi on citrus replant problems were in... more The interactive effects of citrus root residues and soil fungi on citrus replant problems were investigated. The results indicated that incorporation of citrus root residues in combination with the pathogenic fungiPhytophthora citrophthora, Pythium aphanidermatum andFusarium solani in soil caused more reduction to sour orange growth than did the root residues alone. Subsequent experiments showed that extracts of different parts of sour orange and leachates of some soil fungi increased the disease index of citrus roots grownin vitro. The citrus extracts did not affect growth of the test fungi.Thus, it appears that allelopathic compounds of plant and microbial origins build up in old citrus soil and may act as predisposal agents for the infection of citrus roots by soil pathogens.
Field experiment was conducted during the growing season of 2015/16 to test the allelopathic effe... more Field experiment was conducted during the growing season of 2015/16 to test the allelopathic effect of sorghum mulch on yield of faba bean and companion weeds. Plots (1.5 m × 2 m) were covered by dry plant material of sorghum at 5 and 10 t/ha. Plots without sorghum mulch were used as control. Seeds of faba bean were sown in rows at the beginning of October keeping space 40 cm between rows and 20 cm between plants. Weed density and weed dry biomass were recorded at two months after sowing. Yield components of faba bean were measured at the end of the growing season using standard procedures. The experiment was conducted in randomized complete block design with four replications. Sorghum mulch at 5 and 10 t/ha had significantly inhibited weed density by 62 and 78% relative to control and weed biomass by 64 and 90% compared to control, respectively. Plots with sorghum mulch at 5 and 10 t/ha provided higher broad bean above ground biomass (2.71 and 3.05 t/ha, respectively) which were 43...
Laboratory tests were conducted to detect the differential allelopathic potential of two sorghum ... more Laboratory tests were conducted to detect the differential allelopathic potential of two sorghum (Sorghum bicolor) cultivars (Enqath and Rabeh) residues. Chemical analysis of residues indicated that total phenolics were found to be higher in Enqath than in Rabeh plants suggesting the superiority of the allelopathic potential of the first cultivar over the second one against weeds. Results indicated that total phenolics were two folds in shoot than in root of both cultivars. These compounds appeared to be higher in Enqath shoot and root (1.60 and 0.80 mg/g, respectively) than in Rabeh shoot and root (1.2 and 0.50 mg/g, respectively). The increments in total phenolics in root and shoot of Enqath were clearly reflected on the increase of total phenolics in the whole plant reaching about 2.40 mg/g compared to Rabeh (1.70 mg/g). Chemical analysis by high performance liquid chromatography (HPLC) revealed the presence of seven allelochemicals namely ferulic, p-coumaric, gallic, vanillic, s...
Field trial was conducted with the aim of utilizing allelopathic crop residues to reduce the use ... more Field trial was conducted with the aim of utilizing allelopathic crop residues to reduce the use of synthetic herbicides in broad bean (Vicia faba) fields. Sunflower residue at 600 and 1,400 g m-2 and Treflan (trifluralin) at 50, 75 and 100% of recommended dose were incorporated into the soil alone or in combination with each other. Untreated plots were maintained as a control. Herbicide application in plots amended with sunflower residue had the least total weed count and biomass, which was even better than herbicide used alone. Integration of recommended dose of Treflan with sunflower residue at 1,400 g m-² produced maximum (987.5 g m-2) aboveground biomass of broad bean, which was 74 and 36% higher than control and recommended herbicide dose applied alone, respectively. Combination of herbicide and sunflower residue appeared to better enhance pod number and yield per unit area than herbicide alone. Application of 50% dose of Treflan in plots amended with sunflower residue resulte...
A field experiment was conducted at two sites (Baghdad and Wasit Governorates) to evaluate ... more A field experiment was conducted at two sites (Baghdad and Wasit Governorates) to evaluate the effects of allelopathic corn residues applied as soil incorporation or mulch, alone and in combination with reduced (50% of recommended dose) rate of trifluralin herbicide on weeds growth and mung bean yield. Conventional soil tillage and zero soil tillage treatments with corn residues were performed, while 50% dose and full dose of trifluralin only (without residues) treatments were included for comparison. Soil incorporation and mulch of corn residues reduced weed density and dry weight biomass and improved yield and yield components of mung bean in both sites. Mulch application was more effective than soil incorporation for weed control. However, the reduction in weed growth and the increase in mung bean yield were below the levels achieved by the label dose of herbicide. Application of 50% dose of trifluralin in plots incorporated or mulched with corn residues reduced weeds and...
Field trial was conducted in Research Field equipped with rainfall transparent shade, Biology Dep... more Field trial was conducted in Research Field equipped with rainfall transparent shade, Biology Department, College of Science, Baghdad University during the growing season of 2012 to test the potential of sorghum water extract in improving yield and yield components of local cultivar of mung bean crop grown under different moisture deficit stresses. The water stresses were applied by irrigated the plots to field capacity and withheld the next irrigation until the soil water deficit reaches 80, 50 and 30% of field capacity for control, mild water stress and higher water stress, respectively. Foliar application of sorghum water extract at 0 ( control), 2.5 and 5% (W/V) was made at preflowering, flowering and fruiting stages. The experiment was conducted in split plot design with four replications for each treatment. The sorghum water extract rates were kept in the sub plot while moisture deficits were assigned as main plot. Results showed that drought stress significantly reduced the a...
A Field experiments were conducted to test the allelopathic potential of sorghum residues alone a... more A Field experiments were conducted to test the allelopathic potential of sorghum residues alone and in combination with half (1.2 L ha-1) of recommended rate of trifluralin herbicide in controlling weeds in cowpea field. For preparation of sorghum residues, grains of sorghum cv. Enkath were grown in lines in plots of 4 × 3.5 m2 keeping 10 cm between grains and 75 cm between lines. Plots of the same area were left without cultivation to be used in the next experiment as a control. At physiological maturity of sorghum crop, the grains were harvested and the plants were left on the plots to dry under sun for 2 weeks. After that, the sorghum residues were incorporated in to the plot soil at 5 T ha-1 and 10 T ha-1. Plots without residues, plots with half dose of trifluralin herbicide, plots with label rate of herbicide and weed free plots (removing weeds weekly). Incorporation of sorghum residues at 5 T ha-1 reduced weed density by 6% of control at 75 days after sowing (DAS), while incor...
Field trial was conducted during the growing season of 2011-2012 at the Research Field, Departmen... more Field trial was conducted during the growing season of 2011-2012 at the Research Field, Department of Biology, College of Science, Baghdad University to test the performance of wheat cv Rabyaa, Latifiya, Al-Iraq, Tummose 2, Abu-Graib 3, IPA 99 and Sham 6 grown under different soil water deficit stresses. Several agronomic and physiological traits and yield and yield components of the test cultivars were determined. The experiment was conducted in split plot design with five replications for each treatment. The cultivars were kept in the sub plot while water stress treatment was assigned as main plot. Water stress was applied by irrigated the plots to the soil field capacity (FC) then withheld next irrigation until the soil moisture of the respective plots depleted to 50 (control), 25 and 15% of FC. Results indicated that the water deficit stress significantly reduced biological yield, grain yield and yield components, plant height and number of tillers. Also, drought significantly r...
Lipase enzyme has attracted a lot of attention in recent years because of its diverse biotechnolo... more Lipase enzyme has attracted a lot of attention in recent years because of its diverse biotechnological applications. The present study was conducted to screen germinated seeds of four crops, namely sunflower (Helianthus annuus), flaxor linseed (Linum usitatissimum ), peanut (Arachis hypogaea ) and castor bean (Ricinus communis), for the activity of their lipases. to the study also included the extraction and purification of lipase from the seeds of the most promising crop using different solvents. The results indicated that the maximum enzymatic activity (0.669 U/ml) was obtained when 0.1 M Tris-HCl buffer extract was used after 3 days of seed germination of all the tested species, as compared to the other test solvents (acetone and water). Sunflower germinated seeds showed the highest lipase activity, which was higher by 159.67, 185.32, and 285.90 % over the activities of castor bean, flax, and peanut seeds, respectively. Among the used ranges of saturation of ammonium sulfate, the...
The promising allelopathic potential of sorghum ( Sorghum bicolor L. (Moench)) opens a fruitful a... more The promising allelopathic potential of sorghum ( Sorghum bicolor L. (Moench)) opens a fruitful area of research to exploit this phenomenon in weed control and regulation of nutrients cycle. The data suggests that sorghum allelopathy can be exploited in different cropping practices (cover crop, smother crop, companion crop, mixing crop and smother crop to control weeds and inhibition of nitrification) and application of its water extracts in fields controls the weeds and enhances the crops productivity. The herbicidal and allelopathic properties of sorgoleone, a compound isolated from root exudates of sorghum and other allelochemicals in sorghum deserve further work to identify the enzymes responsible for the biosynthesis of these compounds and the genes encoding them. Besides there is need to use genetic engineering to manipulate the identified genes in sorghum or in other crops to enhance their ability to suppress the weeds. This review addresses the research on the role of allelo...
Uploads
Papers by Ibrahim Alsaadawi