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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
- Source :
- Journal of Soil Science and Plant Nutrition. 20:1238-1248
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- 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.
- Subjects :
- 0106 biological sciences
biology
Nutrient management
Soil Science
Sesbania
Growing season
04 agricultural and veterinary sciences
Plant Science
Mineralization (soil science)
engineering.material
biology.organism_classification
01 natural sciences
Green manure
Nutrient
Agronomy
040103 agronomy & agriculture
engineering
0401 agriculture, forestry, and fisheries
Fertilizer
Agronomy and Crop Science
Nitrogen cycle
010606 plant biology & botany
Subjects
Details
- ISSN :
- 07189516 and 07189508
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Journal of Soil Science and Plant Nutrition
- Accession number :
- edsair.doi...........3babd4af6e0a6cca59cff8c155b10eb5