... types of varieties that grow well in the different soil types. Submitted by: Kenya Forestry R... more ... types of varieties that grow well in the different soil types. Submitted by: Kenya Forestry Research Institute (GFIS Institution) (Kenya). PO Box 20412-00200. Nairobi. Contact: Ms Sheila MBIRU. Tel: +254 020 3764726 / 3750497. ...
... HEATWOLE, H., N. MERCADO, AND E. ORTIZ. ... Behavioral Response of the American Alligator to ... more ... HEATWOLE, H., N. MERCADO, AND E. ORTIZ. ... Behavioral Response of the American Alligator to Freezing Weather JOHN M. HAGAN, PAUL C. SMITHSON, AND PHILLIP D. DOERR, Box 5577, Department of Zoology, North Carolina State University, Raleigh, North Carolina ...
Communications in Soil Science and Plant Analysis, Apr 1, 1999
... Comparison of Phosphate Rock and Triple Superphosphate on a Phosphorus-Deficient Kenyan Soil ... more ... Comparison of Phosphate Rock and Triple Superphosphate on a Phosphorus-Deficient Kenyan Soil Patrick K. Mutuo,a,1 Paul C. Smithson,b Roland J. Buresh,b,2 and Robert J. Okaleboa ... Fert. Res. 41:227-234. Cox, FR, EJ Kamprath, and RE McCollum. 1981. ...
A 16-week laboratory incubation experiment was conducted to evaluate the effect of Tithonia diver... more A 16-week laboratory incubation experiment was conducted to evaluate the effect of Tithonia diversifolia leaves on the dissolution of Minjingu (MPR) and Busumbu (BRP) rock phosphates in a Kenyan Oxisol. Triple superphosphate (TSP) fertilizer was included as a positive control. Soil samples were extracted with anion exchange resin (AER) and mixed anion-cation exchange resin (ACER) after 1, 7, 14, 28, 56 and 112 days to estimate plant available P. Soil P fractionation was carried out using solutions of 0.5M NaHCO3, 0.1M NaOH and 1M HCl. The highest mean AER-extractable P concentrations for BRP and MPR treatments were 6.0 and 20 mg kg-1 respectively; while that of the TSP treatments was 24 mg kg-1. The AERextractable P concentrations were in the order TSP > MRP > BRP. The ACER-extractable P concentrations were higher than those of AER. Application of tithonia at 10 tons ha-1 in combination with MPR caused a significant (P
Many soils of southern Africa are severely N deficient, but inorganic fertilizers are unaffordabl... more Many soils of southern Africa are severely N deficient, but inorganic fertilizers are unaffordable for most subsistence farmers. Rotations and intercrops of legumes with crops may alleviate N deficiency through biological N2 fixation and redistribution of subsoil N to the surface. We monitored soil inorganic N dynamics for two seasons in a gliricidia [Gliricidia sepium (Jacq.) Walp.] – maize (Zea mays L.) intercrop in the unimodal rainfall area of southern Malawi. One maize crop per year was grown with or without interplanted gliricidia, in factorial combination with three rates of N (0, 24 or 48 kg N ha-1). Application of gliricidia prunings increased (p < 0.001) topsoil (0 to 20 cm) inorganic N at the end of the dry season and during the early rains. Differences between plus and minus gliricidia treatments were less when total inorganic N to 1-m depth was summed. A greater proportion of the total inorganic N to 1-m depth occurred in the topsoil (0 to 20 cm) when gliricidia was ...
... fraction has been related to the active N pool (Paul, 1984; Bonde et al., 1988), and light-fr... more ... fraction has been related to the active N pool (Paul, 1984; Bonde et al., 1988), and light-fraction N or the particulate organic matter N fraction has been described as being part of the more stabilized N pool (Cambardella and Elliott, 1992 ... Heilman et al., 1965 Brunauer et al., 1938 ...
Page 1. DIVISION S-4—SOIL FERTILITY &amp; PLANT NUTRITION Soil Phosphorus Fractions in Unfert... more Page 1. DIVISION S-4—SOIL FERTILITY &amp; PLANT NUTRITION Soil Phosphorus Fractions in Unfertilized Fallow-Maize Systems on Two Tropical Soils Jeremiah B. Maroko, Roland J. Buresh,* and Paul C. Smithson ABSTRACT ...
A better understanding of soil microbial processes is required to improve the synchrony between n... more A better understanding of soil microbial processes is required to improve the synchrony between nutrient release from plant residues and crop demand. Phospholipid fatty acid analysis was used to investigate the effect of two crop rotations (continuous maize and maize–crotalaria rotation) and P fertilization (0 and 50 kg Pha−1yr−1, applied as triple superphosphate) on microbial community composition in a highly
... types of varieties that grow well in the different soil types. Submitted by: Kenya Forestry R... more ... types of varieties that grow well in the different soil types. Submitted by: Kenya Forestry Research Institute (GFIS Institution) (Kenya). PO Box 20412-00200. Nairobi. Contact: Ms Sheila MBIRU. Tel: +254 020 3764726 / 3750497. ...
... HEATWOLE, H., N. MERCADO, AND E. ORTIZ. ... Behavioral Response of the American Alligator to ... more ... HEATWOLE, H., N. MERCADO, AND E. ORTIZ. ... Behavioral Response of the American Alligator to Freezing Weather JOHN M. HAGAN, PAUL C. SMITHSON, AND PHILLIP D. DOERR, Box 5577, Department of Zoology, North Carolina State University, Raleigh, North Carolina ...
Communications in Soil Science and Plant Analysis, Apr 1, 1999
... Comparison of Phosphate Rock and Triple Superphosphate on a Phosphorus-Deficient Kenyan Soil ... more ... Comparison of Phosphate Rock and Triple Superphosphate on a Phosphorus-Deficient Kenyan Soil Patrick K. Mutuo,a,1 Paul C. Smithson,b Roland J. Buresh,b,2 and Robert J. Okaleboa ... Fert. Res. 41:227-234. Cox, FR, EJ Kamprath, and RE McCollum. 1981. ...
A 16-week laboratory incubation experiment was conducted to evaluate the effect of Tithonia diver... more A 16-week laboratory incubation experiment was conducted to evaluate the effect of Tithonia diversifolia leaves on the dissolution of Minjingu (MPR) and Busumbu (BRP) rock phosphates in a Kenyan Oxisol. Triple superphosphate (TSP) fertilizer was included as a positive control. Soil samples were extracted with anion exchange resin (AER) and mixed anion-cation exchange resin (ACER) after 1, 7, 14, 28, 56 and 112 days to estimate plant available P. Soil P fractionation was carried out using solutions of 0.5M NaHCO3, 0.1M NaOH and 1M HCl. The highest mean AER-extractable P concentrations for BRP and MPR treatments were 6.0 and 20 mg kg-1 respectively; while that of the TSP treatments was 24 mg kg-1. The AERextractable P concentrations were in the order TSP > MRP > BRP. The ACER-extractable P concentrations were higher than those of AER. Application of tithonia at 10 tons ha-1 in combination with MPR caused a significant (P
Many soils of southern Africa are severely N deficient, but inorganic fertilizers are unaffordabl... more Many soils of southern Africa are severely N deficient, but inorganic fertilizers are unaffordable for most subsistence farmers. Rotations and intercrops of legumes with crops may alleviate N deficiency through biological N2 fixation and redistribution of subsoil N to the surface. We monitored soil inorganic N dynamics for two seasons in a gliricidia [Gliricidia sepium (Jacq.) Walp.] – maize (Zea mays L.) intercrop in the unimodal rainfall area of southern Malawi. One maize crop per year was grown with or without interplanted gliricidia, in factorial combination with three rates of N (0, 24 or 48 kg N ha-1). Application of gliricidia prunings increased (p < 0.001) topsoil (0 to 20 cm) inorganic N at the end of the dry season and during the early rains. Differences between plus and minus gliricidia treatments were less when total inorganic N to 1-m depth was summed. A greater proportion of the total inorganic N to 1-m depth occurred in the topsoil (0 to 20 cm) when gliricidia was ...
... fraction has been related to the active N pool (Paul, 1984; Bonde et al., 1988), and light-fr... more ... fraction has been related to the active N pool (Paul, 1984; Bonde et al., 1988), and light-fraction N or the particulate organic matter N fraction has been described as being part of the more stabilized N pool (Cambardella and Elliott, 1992 ... Heilman et al., 1965 Brunauer et al., 1938 ...
Page 1. DIVISION S-4—SOIL FERTILITY &amp; PLANT NUTRITION Soil Phosphorus Fractions in Unfert... more Page 1. DIVISION S-4—SOIL FERTILITY &amp; PLANT NUTRITION Soil Phosphorus Fractions in Unfertilized Fallow-Maize Systems on Two Tropical Soils Jeremiah B. Maroko, Roland J. Buresh,* and Paul C. Smithson ABSTRACT ...
A better understanding of soil microbial processes is required to improve the synchrony between n... more A better understanding of soil microbial processes is required to improve the synchrony between nutrient release from plant residues and crop demand. Phospholipid fatty acid analysis was used to investigate the effect of two crop rotations (continuous maize and maize–crotalaria rotation) and P fertilization (0 and 50 kg Pha−1yr−1, applied as triple superphosphate) on microbial community composition in a highly
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