Abstract
The experiment was conducted during December 2012 to June 2013 in the farmers field adjacent to Bangladesh Agricultural University (BAU), a village named Boira under Sadar Upazilla of Mymensingh to study the yield performance of Boro rice in response to USG. The experiment comprised two rice varieties viz. Binadhan-5 and BRRI dhan29 and seven levels of USG viz.i) prilled urea (PU) 280 kg ha-1(control),ii)USG 1.8g/4 hills in every alternate row applied at 5 cm depth, iii) USG 1.8g/4 hills in every alternate row applied at 10 cm depth, iv) USG 2.7g/4 hills in every alternate row applied at 5 cm depth, v)USG 2.7g/4 hills in every alternate row applied at 10 cm depth, vi) USG 3.6g/4 hills in every alternate row applied at 5 cm depth and vii)USG 3.6g/4 hills in every alternate row applied at 10 cm depth. The experiment was laid out in a randomized complete block design with three replications. Variety, level of USG and their interaction exerted significant influence on yield contributing characters and yield of Boro rice. BRRI dhan29 produced higher number of effective tillers hill-1 and heaviest grain than that of Binadhan-5. As a result of superior yield parameters, BRRI dhan29 gave higher yield (7.67 t ha-1) than Binadhan-5 (6.52 t ha-1). In case of USG, the highest number of total tillers hill-1, grains panicle-1, 1000-grain weight and grain yield (7.59 t ha-1) were obtained from USG @ 3.6g/4 hills in every alternate row applied at 5cm depth. The lowest values of all the parameters were obtained from PU. Considering their interaction effect, BRRI dhan29 with USG 3.6g/4 hills in every alternate row applied at 5cm depth produced best yield attributes, grain (8.38 t ha-1) and straw yield (9.26 t ha-1). The lowest performance was observed in Binadhan-5 with PU. The overall results suggest that farmers can be advised to cultivate BRRI dhan29 fertilized with USG 3.6g/4 hills in every alternate row at 5 cm depth for getting highest yield in Boro season under the agro-climate condition of the study area.J. Bangladesh Agril. Univ. 13(1): 13-17, June 2015
Highlights
Bangladesh is favourable for rice cultivation throughout the year, but the unit area yield is much below to those of other leading rice growing countries of the world
The experiment consisted of two rice varieties viz Binadhan-5 and BRRI dhan29 and seven levels of USG viz. (i) prilled urea 280 kg ha-1, (ii) USG 1.8g/4 hills in every alternate row applied at 5 cm depth, (iii) USG 1.8g/4 hills in every alternate row applied at 10 cm depth, (iv) USG 2.7g/4 hills in every alternate row applied at 5 cm depth, (v) USG 2.7g/4 hills in every alternate row applied at 10 cm depth, (vi) USG 3.6g/4 hills in every alternate row applied at 5 cm depth, (vii) USG 3.6g/4 hills in every alternate row applied at 10 cm depth
The grain yield (7.59 t ha-1) and straw yield (8.49 t ha-1) were the highest with the application of USG 3.6g/4 hills in every alternate row applied at 5 cm depth of placement and the lowest grain yield (5.32 t ha-1)and straw yield (7.13 t ha-1) were obtained from Prilled urea (PU) applied at 280 kg ha-1
Summary
Bangladesh is favourable for rice cultivation throughout the year, but the unit area yield is much below to those of other leading rice growing countries of the world. N is the most important and key input for rice production all over the world for its large requirements and instability in soil. The efficiency of N fertilizer especially urea is very low in rice though urea is the principal source of nitrogen for rice in Bangladesh agriculture. This important element has been found to be deficit in most agricultural soils of Bangladesh. USG stops denitrification process and minimizes urea concentration in irrigation water As a result, it reduces N loss and improves its use efficiency by 2025% (Craswell and De Datta, 1980 and Pillai, 1981). The present study was, undertaken to determine the optimum dose of USG with depth of placement for maximizing yield and yield attributes of two Boro rice varieties
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