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Integrated Nutrient Management
1. Integrated nutrient management approach is required to ensure higher yield. The principle is that most of the fertilizer should be applied up to tillering stage (70–80%), while a small portion should be applied at later stages.
2. An application of 10 t/ha of FYM in the field before pudding is advisable. The application of organic manure at 10–15 t/ha (fresh weight) before ploughing or puddling in addition to inorganic N, P & K is useful.
3. On the basis of research findings, 100:50:50 kg N:P:K per hectare has been found as an optimum dose for better yield in rice. In order to achieve the higher fertilizer use efficiency, fertilizer should be applied in splits doses.
4. Apply nitrogen in 3 splits (40% at basal, 40% at tillering stage and 20% at panicle initiation stage) while full dose of phosphorus (300 kg SSP) and full dose of potash(85 kg MOP) as a basal dose per hectare is recommended . Or the use of Gliricidia leaves @ 10 t/ha (5 tone at the time of second ploughing and 5 tone at the time of puddling) which saves 50 kg Nitrogen (i.e. 110 kg Urea). In case of scented rice 80: 50: 50 kg N:P:K is recommended.
5. In case of hybrid seed production 120:50:50 kg N:P:K is recommended. Apart from NPK fertilization, need based application of Zn and S may be required.
6. Top dressing of P fertilizer at tillering and K fertilizer at panicle initiation and N application at booting stage has been proved to facilitate the supplementary supply of nutrients for plants during the late stage by decreasing the rate of spikelet degeneration and improving the exertion rate and receptivity of stigma.