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Management of Sesbania aculeata Incorporation and Nitrogen on the Performance of Transplanted Rice in Calcareous Soil
- Chaudhary, Sanjay Kumar, Singh, Shiveshwar Pratap, Jha, Shankar, Singh, Yogeshwar
- Communications in soil science and plant analysis 2018 v.49 no.14 pp. 1739-1749
- Sesbania bispinosa, ammonium, calcareous soils, experimental design, fertilizers, field experimentation, flowering, grain yield, nitrates, nitrogen, panicles, rice, tillering
- Two field experiments were conducted to optimize the days for decomposition of dhaincha (Sesbania aculeata) with different nitrogen (N) levels and scheduling in transplanted rice in calcareous soil in a split-plot design with three replications. Incorporation of dhaincha one day before transplanting (1-DBT) obviated the need for allowing N gap. Nitrogen scheduling as 50% at active tillering + 40% at panicle initiation + 10% at flowering recorded the maximum grain yield (59.05 q ha⁻¹) and N–phosphorus (P)–potassium (K) uptake. The different N fractions in post-harvest soil were in the order of total N> total hydrolyzable N> non-hydrolyzable N> exchangeable ammonium (NH₄⁺)–N and nitrate (NO₃⁻)–N. Thus, in calcareous soil, rice may be transplanted immediately after burying the dhaincha without any time gap along with 80 kg N ha⁻¹. Also, application of nitrogenous fertilizer in three splits, delaying N application until active tillering stage, is beneficial for improving rice productivity.