Radiation utilization efficiency nitrogen uptake and modeling crop growth and yield of rainfed rice under different nitrogen rate.
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Title |
Radiation utilization efficiency nitrogen uptake and modeling crop growth and yield of rainfed rice under different nitrogen rate.
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Creator |
Kar, G., Kumar, A. and Mohapatra, S.
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Subject |
Simulation model, rice, nitrogen, radiation utilization efficiency.
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Description |
Not Available
Optimum utilization of photosynthetically active radiation (PAR) along with proper nitrogen (N) management for sustainable rice production is still a promising management recommendation for sustainable rainfed rice cultivation in eastern India. The objective of this investigation was to study radiation utilization efficiency (RUE), N uptake and modeling growth and productivity of wet/rainy season rice (cv. Lalat and Gayatri) under 0, 50, 90, 120 and 150 kg ha−1 N application. Results showed that N rates significantly affected plant biomass, leaf area index (LAI), biological yield (straw and grain yield) and N uptake for both the varieties. The intercepted photosynthetically active radiation (IPAR) and spectral reflectance based vegetation indices (IR/R, NDVI) were also different between two varieties and among N rates. Higher rate of N increased the RUE significantly; averaged over years and varieties, mean values of RUE were 1.35, 1.70, 2.01, 2.15 and 2.17 g MJ−1 under 0, 50, 90, 120 and 150 kg N ha−1, respectively. Though crop growth, yield, N uptake and RUE were higher at 150 kg N ha−1 but the results were at par with 120 kg N ha−1. Agronomic N use efficiency (ANUE) was also low at 150 kg N ha−1. The DSSAT v 4.5 model was applied to simulate crop growth, yield and phenology of the crop under different N rates. Model performance was found to be poor at low N rates (0, 50 kg N ha−1), but the model performed fairly well at higher N rates (90 kg ha−1 and above). Not Available |
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Date |
2018-11-30T04:27:18Z
2018-11-30T04:27:18Z 2014-12-26 |
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Type |
Research Paper
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Identifier |
Kar, G., Kumar, A. and Mohapatra, S. 2014. Radiation utilization efficiency nitrogen uptake and modeling crop growth and yield of rainfed rice under different nitrogen rate. Journal of Indian Society of Soil Science 62(2):39-51
0974-0228 http://krishi.icar.gov.in/jspui/handle/123456789/14304 |
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Language |
English
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Relation |
Not Available;
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Publisher |
Indian Society of Soil Science
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