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Optimizing nutrient management strategies for rice–wheat system in the Indo-Gangetic Plains of India and adjacent region for higher productivity, nutrient use efficiency and profits

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Title Optimizing nutrient management strategies for rice–wheat system in the Indo-Gangetic Plains of India and adjacent region for higher productivity, nutrient use efficiency and profits
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Creator Vinod K. Singh , Brahma S. Dwivedi b, K.N. Tiwari c, Kaushik Majumdar c, Meenu Rani a, Susheel K. Singh a, Jagadish Timsina
 
Subject Optimised nutrient supply Nutrient use efficiency Economic returns Rice–wheat system Indo-Gangetic Plain
 
Description Not Available
Rice (Oryza sativa L.)–wheat (Trititicum aestivum L.) system (RWS) in South Asia is under stress, as
nutrient removals by crops are higher than their replenishment through fertilizers. We evaluated
improved nutrient management strategies at 10 different locations across the Indo-Gangetic Plains (IGP)
of India and adjacent regions during 2003–04 to 2005–06, and compared the improved practices in terms
of yield gain, nutrient use efficiency and economic returns, with existing farmers fertilizer practices (FFP),
and state recommended fertilizer rates by the government departments (SR). Improved N–P–K
application rates were calculated by accounting for the indigenous nutrient supply (INS), yield target and
crop nutrient demand as a function of the interactions between N, P and K. Compared with the SR and FFP,
improved practices increased average grain yield from 0.32 to 3.03 t ha 1 and 1.37–3.69 t ha 1 in rice, and
0.49–1.17 t ha 1 and 0.71–2.26 t ha 1 in wheat across the locations, respectively. Added net return (in US
$) from improved practices over FFP and SR under RWS ranged from 219.6 to 804.9 and from 104.3 to
599 ha 1, respectively. Compared to improved practices, PFPN under SR and FFP were lower by 18.9 and
38.3% in rice, and 18.5 and 39.5% in wheat, respectively. Omission of P and K from improved nutrient
management schedule resulted in yield loss of 0.6–2.8 t ha 1 in rice, and 0.43–1.84 t ha 1 in wheat,
respectively. The annual removal of native P and K in the respective omission plots ranged from 21.8 to
46.1 kg P ha 1 and from 158.4 to 349.1 kg K ha 1. Application of 26 kg P and 99 kg K ha 1 under improved
practices had synergistic effect on nutrient use efficiencies viz. PFPN, AEP, AEK, REP and REK. Results
suggested that optimised nutrient supplies considering crop nutrient needs and INS have potential for
improving yields, nutrient use efficiency and profits in RWS. The improved nutrient management
strategy used in this study could be used in larger domains for improving cereal productivity, nutrient use
efficiency and farm profits.
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Date 2019-12-03T09:19:47Z
2019-12-03T09:19:47Z
2014-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/26633
 
Language English
 
Relation Not Available;
 
Publisher Elsevier