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Subehia S.K.,Forages and Grassland Management | Swapana Sepehya,Forages and Grassland Management
Journal of the Indian Society of Soil Science | Year: 2012

Effect of nitrogen substitution through different organics on yield, uptake and available nutrients in a rice- wheat system was studied after 17 and 18th cropping cycles. Nitrogen substitution through different organics increased significantly the productivity and NPK uptake by rice and wheat. Grain yield of rice, wheat and that of the system increased significantly with the increasing levels of NPK. The maximum yield of rice (3.62 t ha-1) and that of the system (7.04 t ha-1 in terms of rice grain equivalent) was recorded under T5 (50% NPK along with 50% N through FYM during kharif followed by 100% NPK during rabi), while wheat grain yield was maximum (3.20 t ha-1) in T4(100% NPK to both the crops). The total uptake of N, P and K by rice-wheat system was also highest in T5. Though the chemical sources of nutrients increased crop yields over control, these failed to improve the soil properties vis-a-vis combined use of the organics and inorganics. The improvement of soil fertility with respect to available macronutrients and micronutrient cations was also prominent with the application of 50% NPK + 50% N through FYM in kharif followed by 100% NPK in rabi. Source


Sharma S.K.,Forages and Grassland Management | Rana S.S.,Forages and Grassland Management | Subehia S.K.,Forages and Grassland Management | Negi S.C.,Forages and Grassland Management
Indian Journal of Ecology | Year: 2015

On-farm experiment was conducted in sub-montane and low hills sub-tropical zone of Himachal Pradesh to study the impact of application of recommended dose of nutrients and full package of practices with and without farm yard manure (FYM) along with farmers' practice in rice-wheat cropping sequence under irrigated conditions for four consecutive cropping seasons during 2007-08 to 2010-11. The single intervention of applying recommended fertilizer nutrients over the existing farmer's practice increased the overall grain yields of rice and wheat by about 18.1 and 21.9%, respectively. The application of recommended package of practices further increased rice and wheat yields by about 8.1 and 10.2%, respectively and rice grain equivalent yield and net returns by about 30.4 & 40% over the fanner's practice. Both crops also responded to the application of FYM which significantly increased rice and wheat grain and straw yields, rice grain equivalent yield and gross and net returns over the other treatments. Source


Ramesh,Forages and Grassland Management | Rana S.S.,Forages and Grassland Management | Negi S.C.,Forages and Grassland Management | Kumar S.,Forages and Grassland Management | Subehia S.K.,Forages and Grassland Management
Indian Journal of Agronomy | Year: 2014

A field experiment was conducted on a silty clay loam soil of Palampur during 2009–2011, to study effect of tillage and planting-management techniques in maize (Zea mays L.)–wheat {Triticum aestivum (L.) emend. Fiori & Paol.} cropping system. Zero tillage in rainy (kharif) and winter (rabi) seasons resulted comparable yield as with multi-crop planter, manual seed drill and conventional tillage methods. However, multi-crop planter and manual seed drill in the rainy season produced significantly higher effective plants/m2 of maize (8.0 and 7.8, respectively). In case of wheat, conventional tillage in the rainy season produced significantly the highest effective spikes/m2 (322.6) over the other treatments. However, multi-crop planter in the winter season produced significantly the highest effective spikes/m2 (337.6). Water productivity in the rainy season was minimum under zero tillage {41.3 kg maize grain equivalent yield (MEY)/ha-mm} and maximum under manual seed drill {48.5 kg (MEY)/ha-mm}, while water use was the lowest under manual seed drill and the maximum under zero tillage. System’s total energy output was the highest with conventional tillage in the rainy season and multi-crop planter in the winter season. In maize crop, manual seed drill and multi-crop planter in the rainy season produced significantly lower total weed count at 60 days after sowing (DAS). Similarly, the total weed dry weight at 90 DAS was lowest under manual seed drill. In wheat crop, multi-crop planter, manual seed drill and conventional tillage in the winter season produced significantly lower weed count (at 30 and 60 DAS, respectively) compared to zero tillage. Seeding with zero tillage, multi-crop planter and manual seed drill in the rainy season and the winter season could save 9, 11.5 and 6 mandays and 22, 16 and 9 man-days, respectively, over the conventional tillage. © 2014, Indian Society of Agronomy. All rights reserved. Source


Sharma U.,Forages and Grassland Management | Subehia S.K.,Forages and Grassland Management | Rana S.S.,Forages and Grassland Management | Sharma S.K.,Forages and Grassland Management | Negi S.C.,Forages and Grassland Management
Research on Crops | Year: 2014

The present investigation was carried out to study the effect of integrated nutrient management on rice yield and sulphur transformation in soil into its various chemical pools in an on-going long-term fertilizer experiment initiated during kharif 1991 at research farm of CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur. Nine treatments comprising control, inorganics viz., 50 and 100% NPK and conjoint use of 50 and 75% NPK with 50 and 25% N substitution either through FYM, wheat straw or green manure, Sesbania aculeata (Dhaincha) to rice (June-October) followed by 100 and 75% NPK through inorganics to wheat (November-May), respectively, were imposed since the inception of the experiment. Different S fractions were estimated in surface soil samples after the harvest of wheat (June, 2011). Data in respect of grain and straw yield of rice and different soil properties were also recorded for two years (2010 and 2011). The results of surface soil samples (0-0.15 m) collected after the harvest of wheat showed that zero fertilization led to decline in the levels of all the S forms, while application of sulphur containing fertilizer and organics increased it over control. Organic sulphur was found to be the most dominant fraction (about 96%) followed by heat soluble sulphur. Integration of chemical fertilizers with organics proved better as compared to application of chemical fertilizers alone. Integrated use of inorganic fertilizers in conjunction with organics increased pH, organic carbon, CEC, rice grain and straw yields over inorganically treated plots. Highest grain and straw yield of rice was recorded when 50% N was substituted through FYM. Pre-transplant incorporation of 50% N through FYM produced 76.7 q/ha rice grain yield which was statistically at par with yield obtained under its 25% N substitution. Source

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