YIELD AND QUALITY OF AROMATIC RICE VARIETIES AS INFLUENCED BY COMBINATION OF CHEMICAL FERTILIZER AND GREEN MANURE

Abstract

A field experiment was conducted to evaluate the response of green manure and chemical fertilizer on growth, yield and quality of aromatic rice varieties in aman season at the research farm of Sher–e–Bangla Agricultural University, Dhaka, Bangladesh during the period from July to December, 2014. The experiment consisted of two factors; viz. factor A: Three rice varieties namely V 1 = Kataribhog, V 2 = Raniselute and V 3 = BRRI dhan34 and factor B: fertilizer doses viz., T 1 : Recommended doses of NPKSZn, T 2 = 80% recommended doses of NPKSZn + green manure 3.5 t ha -1 , T 3 = 60% recommended doses of NPKSZn + green manure 7 t ha -1 , T 4 = 40% recommended doses of NPKSZn + Green Manure 10.5 t ha -1 , T 5 = 20% recommended doses of NPKSZn + Green Manure 14 t ha -1 and T 6 = Green Manure 17.5 t ha -1 were used for the present study. The experiment was laid out in a split-plot design with three replications. In case of variety green manure and chemical fertilizer significantly affected all characters except dry matter content hill -1 at 15 DAT. Similarly, all traits were also affected significantly due to the effect of fertilizer management, the treatment T 2 (80% recommended doses of NPKSZn + green manure 3.5 t ha -1 ) showed outstanding performance for getting the better growth and higher yield compared to those of other treatments. Most of the studied traits were also influenced significantly due to the effect of interaction of variety and fertilizer management where the growth and yield showed significant variation. The variety BRRI dhan34 treated with 80% recommended doses of NPKSZn + green manure 3.5 t ha -1 (V 3 T 2 ) as well as the highest number of tillers hill -1 (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 hill (15.50), the highest number of grains panicle (212.8) and highest yield of grain (2.67 t ha -1 (252.10), maximum filled grains panicle -1 ) were recorded. The highest (8.85%) and lowest (8.52%) protein content in rice grain was observed in Kataribhog (V 1 ) and BRRI dhan34 (V 3 ), respectively. The highest protein content in rice grain (9.42%) was observed in V 3 T 6 and the lowest protein content in rice grain (7.76%) was found in V 3 T 4 . The highest (77.63%) and lowest (77.12%) carbohydrate content in rice grain was observed in BRRI dhan34 (V 3 ) and Raniselute (V 2 ), respectively. The highest carbohydrate content in rice grain (79.24%) was observed in V 1 T 1 and the lowest (75.00%) was found in V 1 T 4 . Considering the above fact, 80% recommended dose of NPKSZn + green manure 3.5 t ha -1 could be considered the best fertilizer management practice for optimizing the production of aromatic rice during aman season.