A Physiological Approach: Nitrogen Management and Sub-1 Rice Varieties Grown in Flood Prone Ecosystem
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Date
2020
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International Journal of Current Microbiology and Applied Sciences
Abstract
Farmers in flood prone areas mostly use only urea without any solid recommendations.
Possibilities of recurrent flooding/submergence during the season are one of reasons for
avoiding nutrient application, through it has a strong bearing on regeneration growth and
yield of rice varieties after floods, hence suitable nutrient management strategies are
essential to enhance the productivity. However, higher dose of N (60 Kg ha-1 as basal)
showed positive response on plant growth during submergence but higher elongation
caused plant mortality during post oxidative phase. Meanwhile, popular package and
practices among flood prone farmers, addition of Zero Kg N before submergence to
minimized risk was not justified. So far, higher N applied as basal showed negative effect
on survival during post submergence. Plants grown without N fertilizer before
submergence showed 12-23% plant mortality in both Sub-1 rice varieties during post
oxidative phase even though submerged field was substituted with higher dose of N @60
kg ha-1 at 5th days after desubmergence, mainly due to energy starvation during
submergence. After de-submergence frequent addition of split doses of N might be helpful
to meet out the demand of submerged plants for faster recovery.
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