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Subject: Agronomy × End date: 2010 × Start date: 2010 ×
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    ThesisItemOpen Access
    GROWTH AND YIELD OF DIRECT SEEDED RICE (ORYZA SATIVA L.) AS AFFECTED BY SEED RATE AND SEED TREATMENT WITH PLANT GROWTH REGULATORS
    (Punjab Agricultural University, Ludhiana, 2010) Kulbir Singh
    The field experiment entitled “Growth and yield of direct seeded rice (Oryza sativa L.) as affected by seed rate and seed treatment with plant growth regulators” was conducted at Research Farm, Department of Agronomy, Punjab Agricultural University, Ludhiana, during kharif 2009. The soil of experimental field was loamy sand, slightly alkaline in reaction, low in organic carbon and available N, medium in available P and K. The field experiment was conducted in split plot design with 24 treatment combinations viz. three seed rates in main plots (30, 40 and 50 kg ha-1) and eight seed treatments in sub-plots (dry seeding, water soaked seeding, GA3 50 ppm, GA3 100 ppm, Kinetin 20 ppm, Kinetin 40 ppm, NAA 20 ppm and NAA 40 ppm seed soaking) with three replications using the cultivar PR115. Emergence count increased significantly with the increase in seed rate and majority of the seedlings emerged by 13 DAS. Tillers recorded at 30 DAS were significantly higher with 50 kg ha-1 seed rate as compared to 30 kg ha-1. However, at subsequent stages the effect was non-significant. Leaf area index (LAI) and dry matter accumulation with 50 kg ha-1 seed rate were significantly higher as compared to 30 kg ha-1 at 30, 60 and 90 DAS. At harvest, effect of seed rate on dry matter accumulation was non-significant. Yield attributes (viz. effective tillers, panicle length, grains per panicle, filled grains per panicle and thousand grain weight) were non-significantly influenced by seed rate. Thus, effect of seed rate on grain and straw yield also remained non-significant. Effect of seed treatment with different plant growth regulators on emergence count, periodic plant height, number of tillers, crop dry matter accumulation, LAI, weed count and weed dry weight, root density, yield attributes, grain and straw yield was not significant. It is concluded that seed rate of 30 kg ha-1 is sufficient for direct seeded rice and seed treatment with different plant growth regulators (GA3, kinetin and NAA) at these concentrations and 8 hours soaking period was not beneficial.