COMPARISON OF DIFFERENT TECHNIQUES OF UREA APPLICATION IN RICE FIELD

Abstract

A research work was carried out at the Research Farm, Hajee Mohammad Danesh Science and Technology University, Dinajpur, during the period from August 2016 to November 2016 to determine the suitable nitrogen source on the growth performance as well as the grain yield of Aman rice cv. Bina dhan-7. The soil was sandy loam in texture having pH 4.72, organic matter content 1.64%, total N 0.08%, available P 55.96 ppm, exchangeable K 0.21 me q 100 g-1 soil, available S 19.75 ppm. The experiment was laid out in a randomized complete block design with four treatments and three replications. The treatments were: T1= 194 kg/ ha urea at two equal splits, T2= Urea Super Granules @ 81.5 kg/ha (Only once), T3= 2% foliar spray solution @ 45 kg/ha (Three times), T4= Prilled urea 138kg/ha (Only once). The broadcast urea was applied after 11 days and 33 days of transplanting. The foliar urea was applied after 9 days, 24 days and 41 days of transplanting. USG and Prilled urea were applied after 7 days of transplanting at 8 cm depth among four hills in alternate rows. USG showed significant effect on all the yield and yield contributing characters of Aman rice. The result revealed that the highest grain yield (3.42 t ha-1) was obtained from T2 (Urea Super Granules @ 81.5 kg/ha) and the lowest grain yield (2.68 t ha-1) was obtained from T3 (2% foliar spray solution @ 45 kg/ha). The treatment T2 (Urea Super Granules @ 81.5 kg/ha) produced 14.38% higher grain yield than traditional method T1 (194 kg/ ha urea at two equal splits). It was also found that the highest straw yield (9.26 t ha-1) iii was obtained from T2 (Urea Super Granules @ 81.5 kg/ha) which was statistically different from other treatments T1, T3 and T4. The deep placement of USG enhanced the recovery of applied N and N use efficiency in comparison with other application of urea. So the treatment T2 (Urea Super Granules @ 81.5 kg/ha) may be recommended for profitable cultivation of Aman rice.