International Journal of Environment and Climate Change

Effect of Dates of Sowing on Grain Yield of Rabi Rice (Oryza sativa L.)

Boppidi Manasa Reddy *

Department of Agronomy, College of Agriculture, Rajendranagar, PJTSAU, 500030, India.

S. G. Mahadevappa

ACRC, ARI, Rajendranagar, Hyderabad, PJTSAU, 500030, India.

K. Indudhar Reddy

AICRP on Women in Agriculture, PG&RC, PJTSAU, 500030, India.

K. Pavan Chandra Reddy

AICRP on STCR, ARI, Rajendranagar, PJTSAU, 500030, India.

*Author to whom correspondence should be addressed.

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Abstract

Aim: To determine the optimum date of sowing to realize higher grain yield in rabi rice.

Study Design: Split plot.

Place and Duration of Study: Krishi Vigyan Kendra, Rudrur, Nizamabad during rabi, 2022.

Methodology: The experiment consisted of a total of fifteen treatments which were laid out in split plot design with three replications. Treatments included were five dates of sowing in the main plot M₁-20^th November, M₂-1^st December, M₃-10^th December, M₄-20^th December, and M₅-30^th December and three treatments of varieties in subplots S₁-JGL 24423 (long slender variety), S₂-Ganga Kaveri (medium slender variety) and S₃-RNR 15048 (short slender variety) randomly placed in subplots of the main plot.

Results: Maximum plant height (100.3 cm), number of tillers m^-2 (432), dry matter accumulation (15869 kg ha^-1), grain yield (7219 kg ha^-1), straw yield(8387 kg ha^-1) and HI (46.1) was noticed in crop Sownon 30^thDecember. Significantly maximum number of tillers m^-2, dry matter accumulation (14263 kg ha^-1), grain yield (6127 kg ha^-1), straw yield (8650 kg ha^-1) was observed in S₂-Ganga Kaveriwhile significantly higher plant height (100.6 cm) and HI (45.0) was found in S₃-RNR 15048. Lowest height was recorded in S₂-Ganga Kaveri (92.6 cm), and above parameters were recorded lowest in crop sown on 20^th November, while lowest number of tillers m^-2and straw yield (8122 kg ha^-1) was observed in crop sown on 1^st December.Significantlyless number of tillers m^-2 (326), dry matter accumulation (13981 kg ha^-1), grain yield (6166 kg ha^-1), straw yield (7526 kg ha^-1) was recorded in S₃-RNR 15048, while lowest HI (43.9) was recorded in S₁-JGL 24423.

Conclusion: Crop sown on 30^thDecember revealed better performance in terms of grain yield under the present study during Rabi conditions. Among varieties, Ganga Kaveri (S₂) performed better in terms of grain yield.

Keywords: Sowing dates, varieties, yield

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