Shantappa Duttarganvi

A field experiment was conducted at Raichur during kharif-2009 to validate the effect of Leaf Colour Chart (LCC) and Soil and Plant Analysis Development meter (SPAD) based nitrogen (N) management on growth and yield of lowland rice (Oryza sativa L.). Treatments consists of N application based on LCC thresholds (3.5 to 5.0) and SPAD values (30 to 40) compared with state recommendation and farmers’ practice (220 kg ha -1 ), were imposed through RCBD replicating thrice. The results revealed that N application based on LCC values @ 5 (120 kg ha -1 ) and SPAD @ 37.5 (120 kg ha-1) were more beneficial in enhancing the growth and yield of the low land rice. The split application of N at higher doses enhances its uptake over basal application. Significantly better growth parameters were recorded when N requirement for rice was applied based on LCC @ 5 (120 kg ha-1)) and SPAD @ 37.5 (120 kg ha -1 ). These were also recorded better yield parameters over farmers’ method and low N rates treatme...

A field experiment was conducted during rainy (kharif) and winter (rabi) seasons of of 2012–13 and 2013–14 at the Indian Institute of Rice Research (IIRR), Hyderabad, Telangana, in clay loam soils, to evaluate the influence of different establishment techniques, irrigation water levels and weed-management practices on productivity, growth and yield of rice (Oryza sativa L.). System of rice intensification (SRI) was significantly superior to conventional and mechanized transplanting for grain yield (6.10 and 6.47 t/ha), yield attributes like panicles/m2 (376 and 405), panicle weight (4.6 and 4.9 g), 1, 000-grains weight (17 and 18 g) and growth parameters like leaf area (2, 743.6 and 2, 820.5 cm2/hill) and effective tillers/m2 (470 and 482) during kharif and rabi respectively, in both the years. Alternate wetting and drying (AWD) and cono-weeding recorded significantly higher growth and yield parameters over the other irrigation and weed-management practices, respectively, due to pro...

Both 150 per cent RDF and 125 per cent RDF were significantly superior over 100 per cent RDF.Among nutrient management practices soil application of MgSO4 + three foliar sprays of MgSO4 (1%) + KNO3 (2%) recorded maximum seed cotton yield as compared to control. However, the combination resulted in at par seed cotton yield with soil application of MgSO4, with three foliar sprays of MgSO4 (1%) + 19:19:19(1%) and soil application of MgSO4 + three sprays of MgSO4 treatments.

Pulses have distinct morpho-physiological response under reduced sunlight. But little is known for their capacity to adapt to the level of shading encountered in crop mixtures. Field experiment was conducted to evaluate the pulses under artificial shade during rainy season at Raichur, Karnataka. Objectives were to select potential pulse crop tolerant to shade based on productivity and radiation use efficiency (RUE). Experiment was laid out in split-plot design, wherein light intensity (unshade, 50 and 75% shade) in main plots and pigeon-pea, cowpea, lablab and black-gram were in sub plots. Shade levels were created by the erection of white shade nets at 25 DAS continued upto harvest. Results indicated that irrespective of the crop more pods, grain, stover and protein yield were recorded under unshade. While, pigeon-pea and lablab were produced significantly higher yield under unshade, however, these were also well performed under 50 per cent shade over black-gram and cowpea. However...

An investigation on real-time nitrogen management in rice through LCC (Leaf Colour Chart) and SPAD (Soil and Plant Analysis Development Meter) was carried out at the new area Farm, College of Agriculture, Raichur, Karnataka. Treatment consists of five levels of LCC and five levels of SPAD meter compared with farmers and recommended method of nitrogen application. Significantly higher grain yield per hectare was noticed with farmers (44.53 q ha -1) method of nitrogen application and it was on par with LCC 5 (42.40q ha -1), LCC 5.5 (43.33 q ha -1), SPAD 37.5 (42.50 q ha -1) SPAD 40 (43.80q ha -1) and recommended method (43.07 q ha -1) when compared to other methods of N application. The higher grain yield in rice was mainly attributed to higher yield attributes like number of panicles per hill, grains per panicle and test weight. Results show that plant need-based N management through LCC and SPAD meter reduces N requirement of rice by 20 and 45.5 per cent over recommended and farmers...

A field experiment was conducted at Raichur during kharif-2009 to validate the effect of Leaf Colour Chart (LCC) and Soil and Plant Analysis Development meter (SPAD) based nitrogen (N) management on growth and yield of lowland rice (Oryza sativa L.). Treatments consists of N application based on LCC thresholds (3.5 to 5.0) and SPAD values (30 to 40) compared with state recommendation and farmers’ practice (220 kg ha-1), were imposed through RCBD replicating thrice. The results revealed that N application based on LCC values @ 5 (120 kg ha-1) and SPAD @ 37.5 (120 kg ha-1) were more beneficial in enhancing the growth and yield of the low land rice. The split application of N at higher doses enhances its uptake over basal application. Significantly better growth parameters were recorded when N requirement for rice was applied based on LCC @ 5 (120 kg ha-1)) and SPAD @ 37.5 (120 kg ha-1). These were also recorded better yield parameters over farmers’ method and low N rates treatments. T...

Leaf reddening significantly reduced with higher dose of NPK fertilizers and also with foliar sprays of MgSO +KNO , MgSO +19:19:19 and MgSO thrice 4 3 4 4 -1 combined with initial soil application of MgSO @ 25 kg ha . The extent of 4 reduction with 125 and 150 per cent RDF was 15.4 and 30.1 per centre spectively. It was 2.52 per cent with100 per cent RDF,while18.7 and 16.2 per cent with three foliar sprays of MgSO +KNO and MgSO +19:19:19 4 3 4 respectively, along with soil application of MgSO as compared to control 4 (2.40per cent).Sucking pests populations like aphids, thrips and leaf hoppers populations also increased with soil and foliar application of fertilizers, but higher nutrient sources can develop resistance against populations of sucking pests which interm will not cause any yield reduction in irrigated Bt cotton. L e a f r e d d e n i n g i s a m a j o r physiological concern in the cultivation of Bt cotton. Usually reddening occurs after boll formation resulting in15-25...

A field experiment was conducted at Raichur during  kharif-
2009 to validate the effect of Leaf Colour Chart (LCC) and Soil and Plant Analysis Development meter (SPAD) based nitrogen (N) management on growth and yield of lowland rice (Oryza sativa L.). Treatments consists of N application based on LCC thresholds (3.5 to 5.0) and SPAD values (30 to 40) compared with state recommendation and farmers’ practice (220 kg ha -1
), were imposed through RCBD replicating thrice. The results revealed that N application based on LCC values @ 5 (120 kg ha
-1)and SPAD @ 37.5 (120 kg ha-1) were more beneficial in enhancing the growth and yield of the low land rice. The split application of N at higher doses enhances its uptake over basal application. Significantly better growth parameters were recorded when N requirement for rice was applied based on LCC @ 5 (120 kg ha-1) and SPAD @ 37.5 (120 kg ha-1). These were also recorded better yield parameters over farmers’ method and low N rates treatments. The results of the study implied that LCC threshold @ 5.0 or SPAD @ 37.5 are found to be effective as a decision tool for optimum N application in rice.