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Dar S.R.,International Rice Research Institute | Thomas T.,Allahabad University | Dagar J.C.,Indian Council of Agricultural Research | Lal K.,Indian Agricultural Research Institute | And 6 more authors.
Journal of Food, Agriculture and Environment | Year: 2012

Field experiment was conducted to evaluate effect of spent mushroom composts of varied C:N ratio with and without fertilizer nitrogen on yield, nitrogen uptake and nitrogen forms in rice grown on the Inceptisol of Allahabad. Nitrogen mineralization from oyster spent mushroom compost (OYSMC) was slower than from white button spent mushroom compost (WBSMC) when used alone or with mineral fertilizer nitrogen. Ammonia nitrogen dominated over nitrate nitrogen among mineral nitrogen forms. The highest accumulation of nitrate and ammonia nitrogen occurred under conjunctive use of narrow C:N ratio WBSMC with mineral fertilizer nitrogen. Hydrolysable nitrogen content generally decreased with use of mineral fertilizer nitrogen, compared to varied C:N ratio composts. An increase in the organic nitrogen forms, i.e. nitrogen contained in amino sugars, amino acids and ammonia nitrogen was conditioned primarily on the application of composts. Crop yield was even lower than control when wider C:N ratio OYSMC was used but highest yield was obtained by supplying nitrogen through WBSMC and mineral fertilizer nitrogen. Application of WBSMC 5 t ha-1 can produce a rice yield comparable with that produced from application of fertilizer nitrogen 90 kg ha-1.

Narayan S.,Sher-e-Kashmir University of Agricultural Sciences and Technology | Narayan S.,Central Institute for Temperate Horticulture | Kanth R.H.,Sher-e-Kashmir University of Agricultural Sciences and Technology | Kanth R.H.,Central Institute for Temperate Horticulture | And 8 more authors.
Indian Journal of Agronomy | Year: 2014

A field experiment was conducted during the rainy (kharif) seasons of 2008 and 2009 at Shalimar, Srinagar in a split plot design having 3 dates in the main plots and 6 sources of nutrients through the combinations of organic and inorganic fertilizers in the sub-plots with 3 replications, to find out their effect on productivity and profitability of potato (Solanum tuberosum L.). Among the dates, planting on 25 March recorded significantly higher tuber yield (35.7t/ha) and benefit: cost ratio (1.89) than that sown on 10 March and 11 April during both the years. Plant height, number of shoots, shoot dry matter, leaf-area index (LAI) and number of tubers/hill (11.48) were also the highest in 25 March planting as compared to the other planting dates. Application of 75% of full recommended dose of fertilizers (RDF) (120:75:75 NPK/ha) + 8 t/ha vermicompost + pre-sowing tuber treatment with Azotobacter and phosphorus-solubilizing bacteria proved significantly superior in terms of number of tubers hill, harvest index, tuber yield (32.7 t/ha) and benefit: cost ratio (1.75) of potato over rest of the treatments during both years. © 2014, Indian Journal of Agronomy. All rights reserved.

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