Influence of Variable Irrigation Schedules and Nitrogen Levels on PAR (%) of Rice (oryza Sativa L.) in Temperate Ecology of Kashmir
Ecology, Environment and Conservation（2024）
Abstract
A field experiment was conducted at Faculty of Agriculture, Wadura, Sopore, SKUAST-Kashmir during Kharif 2021 and 2022 on silty clay loam soil. The soil of the experimental field was neutral in reaction, medium in available N, P and K and organic carbon. The experiment comprised of four irrigation schedules: I1 : Recommended Irrigation Scheduling, I2 :At field capacity (20 L m-2), I3 :10 % depletion from field capacity (20 L m-2) and I4 : 20 % depletion from field capacity (20 L m-2), assigned to main plots and four nitrogen levels including N0 : Control, N1 : 75 % RDN (Recommended dose of nitrogen), N2 : 100 % RDN and N3 : 125 % RDN assigned to sub-plots, replicated thrice. The test variety evaluated was Shalimar Rice-4 (SKUA-408) and the experiment was laid out in split plot design. The data revealed that recommended irrigation scheduling though at par with application of irrigation water at field capacity recorded significant increase in intercepted PAR (photosynthetically active radiation) (%) as compared to other irrigation schedules during both the years of experimentation. Among the different nitrogen levels, 125 % RDN treatment recorded significantly higher values of intercepted PAR (%)but was at par with 100 % RDN treatment during 2021 and 2022. Significantly lowest values of intercepted PAR (%) were observed when the irrigation water was applied at 20 % depletion from field capacity among irrigation schedules and control treatment among nitrogen levels during both the years of experimentation.
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