Performance of site-specific and real-time N management strategies in irrigated rice
2008
Stalin, P. | Ramanathan, S. | Natarajan, K. | Chandrasekaran, B. | Buresh, R.
Field experiments were conducted during kharif and rabi seasons of 2001 and 2002 with the objective of evaluating the performance of different fertilizer N management strategies including site-specific and real-time N management, on dry matter production, N uptake, yield, yield components and N use efficiency in rice. Among the different N fertilization strategies tried, both site-specific nutrient management (SSNM) with fixed N split approach i.e., 115 :t 20 kg ha-I in kharifand 140:t 20 kg N ha-I in rabi as well as real-time N management viz., leaf colour chart (LCC) with critical value 4 based N management (N applied at LCC=4) (35 kg N ha-I in kharifand 30 kg N ha-1 in rabi when the LCC value fell below 4) registered higher dry matter pfoduction, N uptake, N use efficiency and grain yield than the other treatments. The results suggest that as a simple tool, the adoption of real-time N management viz., the LCC=4 based N management is a profitable proposition ofN fertilization strategy for rice.
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