Posts Tagged ‘Rice’

Economics of nitrogen fertiliser application in rice, wheat and maize grown in the indo-gangetic plains

Posted by Carelia Juarez on , in Journal Articles

Published in Indian Journal of Fertilisers 8 (8) : 62-71, 2012

T. Satyanarayana, Kaushik Majumdar, Vishal Shahi, Anil Kumar, Mirasol Pampolino, M. L. Jat, V. K. Singh, Naveen Gupta, Vinay Singh, B. S. Dwivedi, Dalip Kumar, R. K. Malik, Vicky Singh, H. S. Sidhu and Adrian Johnston

Nitrogen (N) is a key factor for cereal production in India. N is predominantly supplied to the plants through fertiliser application. The average response to applied fertiliser N has been declining steadily over the past decades. As a result, farmers are compelled to apply higher doses of fertiliser N to maintain the yields of the preceding years. Considering the increasing demand of N fertiliser in the coming years, wide variability in soil N supplying capacity and wide production gaps in the predominant cereals, the present on-farm study was undertaken in the Indo-Gangetic Plains (IGP). The objective was to estimate response of cereals (rice, wheat and maize) to N application, the economics and profitability of N application with changing fertiliser price scenario. On-farm results indicated yield loss due to N omission to the tune of 667-3337 kg ha-1in rice, 500-4750 kg ha-1 in wheat and 400- 5160 kg ha-1 in maize. On the other hand, optimum use of N at observed N response levels, current and projected prices of N fertiliser and minimum support price of rice, wheat and maize had return on investment e” 3 indicating increasing significance of precise N management in cereals in the IGP. Results also suggest that advanced strategies of N management considering the indigenous N supplying capacity of soil, yield response, and agronomic efficiency of N at a given environment may become an important tool for improving farm profitability from N use in IGP.



Crop response and economics of phosphorus fertiliser application in rice, wheat and maize in the Indo-gangetic plains

Posted by Carelia Juarez on , in Journal Articles

Published in Indian Journal of Fertilisers 8 (6): 62-72, 2012

M. L. Jat, Dalip Kumar,  Kaushik Majumdar, Anil Kumar, Vishal Shahi, T. Satyanarayana, Mirasol Pampolino, Naveen Gupta, Vinay Singh, B.S. Dwivedi, V.K. Singh, Vicky Singh, B.R. Kamboj, H.S. Sidhu and Adrian Johns

 Phosphorus (P) is one of the major essential plant nutrients. Physiological processes and yield of cereals are adversely affected in soils deficient in phosphorus. Phosphorus deficiency is widespread in Indian soils and response of cereals to applied P is often spectacular. P use has increased significantly with increasing food grain production in India. Recent increase in P fertiliser cost, however, has raised concerns about the profitability of P application in cereals. Results of on-farm P omission plot experiments conducted across the Indo-Gangetic Plain indicated an average P response of 712, 969 and 853 kg/ha in rice, wheat and maize, respectively. This suggests that skipping P application or blanket reduction in P application rates across a region or the country would adversely affect cereal production in India. Economic assessment based on application rates, nutrient response, cost of phosphate and minimum support price ofthe cereals showed return on investment (Rs/Re) of 2 in all scenarios. A mechanism of optimizing return on investment in P fertiliser in changing fertiliser price scenario and variable crop P response situations was highlighted. In general, a crop response based site specific P management strategy would help in maximizing yield and profitability of major cereals under increasing fertiliser price scenario.


Characterization of the effect of a QTL for drought resistance in rice, qtl12.1 , over a range of environments in the Philippines and eastern India

Posted by on , in Journal Articles

Published in Euphytica 166(2): 207-217

Characterization of the effect of a QTL for drought resistance in rice, qtl12.1 , over a range of environments in the Philippines and eastern India

Jérôme Bernier, Arvind Kumar, Ramaiah Venuprasad, Dean Spaner, Satish Verulkar, Nimai P. Mandal, Pramod K. Sinha, Puvvada Peeraju, Praba R. Dongre, R. N. Mahto and Gary Atlin

A large-effect QTL for grain yield under drought conditions (qtl12.1) was reported in a rice mapping population derived from Vandana and Way Rarem. Here, we measured the effect of qtl12.1 on grain yield and associated traits in 21 field trials: ten at IRRI in the Philippines and 11 in the target environment of eastern India. The relative effect of the QTL on grain yield increased with increasing intensity of drought stress, from having no effect under well-watered conditions to having an additive effect of more than 40% of the trial mean in the most severe stress treatments. The QTL improved grain yield in nine out of ten direct-seeded upland trials where drought stress was severe or moderate, but no effect was measured under well-watered aerobic conditions or under transplanted lowland conditions. These trials confirm that qtl12.1 has a large and consistent effect on grain yield under upland drought stress conditions, in a wide range of environments