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Nitrogen Mineralization and Availability at Critical Stages of Rice (Oryza sativa) Crop, and Its Relation to Soil Biological Activity and Crop Productivity Under Major Nutrient Management Systems

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Title Nitrogen Mineralization and Availability at Critical Stages of Rice (Oryza sativa) Crop, and Its Relation to Soil Biological Activity and Crop Productivity Under Major Nutrient Management Systems
Not Available
 
Creator Ajay Kumar Bhardwaj, Deepika Rajwar, Nirmalendu Basak, Neelam Bhardwaj, Suresh Kumar Chaudhari, Suryanarayana Bhaskar, Parbodh Chander Sharma
 
Subject Nitrogen
Crop residue Mineralization
Green manure
Legume
Integrated nutrient management
 
Description Not Available
Adequate nitrogen availability to plants for growth is one of the most important reasons for fertilizer application. Though organic alternatives are recommended, there is uncertainty of their nutrient release characteristics, especially during critical growth stages of a crop. In a 10-year-long experiment on nutrient management for rice-wheat cropping, ion exchange resin (IER) membrane strips were used as plant root simulators to determine daily NH4+-N and NO3−-N availability in soil solution during the rice growing season. The management included inorganic fertilizers at 100% recommended rate (F), compared to reduced rate (55%)
of inorganic fertilizers supplemented with organic inputs via green manuring with Sesbania (GM), biomass incorporation of an opportunity legume crop-green gram (Vigna radiata) (LE), 1/3rd wheat stubble retention and soil incorporation (WS), 1/3rd rice stubble retention and soil incorporation (RS), and farmyard manure application (FYM). The total amount of available N (NH4+ +NO3−) recorded for the full season was in the order GM (221 μg cm−2) > F (184 μg cm−2) > RS (181 μg cm−2) > FYM (176 μg cm−2) > WS (176 μg cm−2) > LE (175 μg cm−2). Both grain and straw yield related directly and significantly to the N mineralization in soil at 30–60 days after transplanting (DAT), indicating that fertilizer N application before 30 DAT and after 60 DAT could mostly be a loss in transplanted rice crop. Green manured (GM) soils maintained steadily high N mineralization
rates throughout the rice growing period. The best alternative to cut down inorganic fertilizer use in rice cropping would be the biomass incorporation from leguminous green manuring crops. Integration of organics afforded almost 50% reduction in recommended inorganic fertilizer use while maintaining better N mineralization status at the critical growth stages of rice.
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Date 2020-12-29T07:06:03Z
2020-12-29T07:06:03Z
2020-02-20
 
Type Research Paper
 
Identifier Bhardwaj, A.K., Rajwar, D., Basak, N. et al. Nitrogen Mineralization and Availability at Critical Stages of Rice (Oryza sativa) Crop, and Its Relation to Soil Biological Activity and Crop Productivity Under Major Nutrient Management Systems. J Soil Sci Plant Nutr 20, 1238–1248 (2020). https://doi.org/10.1007/s42729-020-00208-y
10.1007/s42729-020-00208-y
http://krishi.icar.gov.in/jspui/handle/123456789/44201
 
Language English
 
Relation Not Available;
 
Publisher Springer