EFFECTS OF DIFFERENT MANURE AND-FERTILIZERS ON GROWTH- AND YIELD CONTRIBUTING CHARACTERS OF RICE

Abstract

A field ~-periment was conducted to evaluate the response of green manure and chemica) fertilizer on growth and yield of rice varieties in aman season at the research farm of Sber-e-Bangla Agricultural University, Dhaka, Bangladesh during. the period from July to December, 2019. The experiment consisted of two factors; viz. factor A: Three rice varieties namely V]= Kataribhog, V2 = BRRI dhan41 and V3 = BRRI dhan34 and factor B: fertilizer doses viz., Tl: Recommended doses ofNPKSZn, T2 = 800' recommended doses of NPKSZn + green manure 3.5 t ha", T3 = 60% recommended doses ofNPKSZn + green manure 7 t ha", T4' = 40% recommended doses of NPKSZn, Green Manure 10.5 t ha", T5 = 20% recommended doses of NPKSZn +Green Manure 14 t ha" and T6 = Green Manure 17.5 t ha-I were used for the present study. The experiment was laid out in a split-plot design with three replicanons, 1n case of variety green manure and chemical fertilizer significantly affected all characters except dry matter content hiIJ-t at 15 DAT. Similarly, all traits were also affected significantly due to the effect of fertilizer management, the treatment 1'2 (80% recommended doses of NPKSZn + green manure 3.5 t ha") showed outstanding performance for getting the better growth and higher yield compared fo those of other treatments. Most of the studied traits were also influenced significantly due to the effect of interaction of variety and fertilizer management wbere the growth and yield showed significant variation. The variety BRR! dhan34 treated with SOOIo recommended doses ofNPKSZn + green manure 3.5 t ha-l (V3T2) as well as the highest number of tillers 'hill·l (13.93, 19.78, 21.33, 21.00, 20.44 and 19.44 at 15, 30, 45, 60, 75 DAT and at harvest, respectively), maximum effective tillers hiU-1 (15.50), the highest number of grains panicle" (252.10), maximum filled grains panicle" (212.8) and highest yield of grain (2.67 t ha") were recorded. The highest (8.85%) and lowest (8.52%) protein content in rice grain was observed in Kataribhog (VI) and BRRI dhan34 (V3), respectively. The highest protein content in rice grain (9.42%) was observed in V3T6 and the lowest protein content in rice grain (7.76%) 'was found in V3T4. The highest (77.63%) and lowest (77.12%) carbohydrate content in rice grain was observed in BRRI dhan34 (V3) and BRRI dhan52 (V2), respectively. The highest carbohydrate content in rice grain (79.24%) was observed in VITt and the lowest (75.00%) was found in VIT4. Considering the above fact, 80% ' recommended dose of NPKSZn + green manure 3.5 t ha'icould be considered the best fertilizer management practice for optimizing the production of aromatic rice during aman season.