Planting techniques on productivity of organically grown scented rice (Oryza sativa L.) in Assam

摘要

A field experiment on scented (joha) rice var. 'Badshahbhog' was carried out in the organic block located at Instructional-cum Research Farm of Assam Agricultural University, Jorhat during kharif seasons of 2013 and 2014 to evaluate the effects of 3 planting patterns and 5 staggered planting with different types of seedling under rainfed condition. Among different planting patterns grain yield was recorded highest for rectangular planting (1.40 t/ha) followed by skip row planting (1.37 t/ha). Among different planting dates, transplanting on 10th September with 70 days old (35+35 days) double planted seedlings (DPS) produced the highest grain yield of 1.61t/ha with H.I of 37.25 per cent On the other hand, the straw yield was recorded lowest on 10 September planting with (35+35 days)double planted seedlings. The highest straw yield was recorded on 1 August planting using 30 days nursery seedling (DNS) and decreased with the advancement of planting dates. The increase in grain yield with 10,h September planting over Ist, 10th, 20"' and 30th August planting was 7.83,17.39, 22.36 and 27.95 %. Total uptake ofN, P and K by grain + straw recorded the highest when planting was done on Ist August using 30 DNS. The highest value in terms of net returns and benefit-cost ratio were recorded on Ist August planting followed by 10,h September planting.