Optimization of nitrogen doses and time of application in semi dry rice to enhance productivity under southern dry zone of Karnataka
DOI:
https://doi.org/10.59797/ija.v70i1.5483Keywords:
Semi dry rice, Nitrogen, Potassium, YieldAbstract
A field experiment was conducted on a sandy clay loam soil at College of Agriculture, Vishweshwaraiah Canal Farm (V. C. Farm), Mandya during kharif 2019 and kharif 2020 to study the growth and yield of semi dry rice of rice influenced by combination of nitrogen and potassium doses and time of application. Soil was alkaline in reaction with pH of 8.97 and low in electrical conductivity (0.33 dS m-1). The fertility status of the soil at experimental site was low in organic carbon (0.35%), available nitrogen (212.53 kg N ha-1) and available potassium (131.76 kg K2O ha-1), however it was high in available phosphorus (104.38 kg P2O5 ha-1). The experiment was laid out in split-plot design replicated thrice, the treatments comprised of two nutrient doses (100% RDNK and125% RDNK) assigned to main plots and seven time of application different split application in sub plots. The results of the study indicated that application of 125% RDNK registered higher number of tillers and panicles (340.60 and 298.31 m-2), filled grains panicle-1 (86.3), 1000-grain weight (21.04 g), grain and straw yields (5515 and 7408 kg ha-1 respectively) than the application of 100% RDNK and application of N at 4 splits as, 25% each at sowing, early tillering (ET), tillering (T) and panicle initiation (PI), K at 2 splits (50% at basal and 50% at panicle initiation (PI) 125% RDNK registered higher number of tillers and panicles (345.42 and 302.17 m-2), filled grains panicle-1 (133.14), 1000-grain weight (21.14 g), grain and straw yields (5567 and 7541 kg ha-1 respectively) than the application of 100% RDNK over other splits.
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