Effect of nitrogen fertilizer and weed management on the yield of transplant aman rice

Abdur Rahman Sarkar,Jyoti Adhikari,Kawsar Hossen,Md Romij Uddin,Umme Rosemila,Uttam Kumer Sarker

doi:10.3329/jbau.v16i1.36473

Abstract

The research work was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during aman season from July to December 2015 to study the effect of nitrogen fertilizer and weed management on the growth and yield of transplant aman rice cv. BRRI dhan46. The experiment consisted of four fertilizer treatments viz. 0 kg N ha−1 (N0), 40 kg N ha−1(N1), 80 kg N ha−1(N2) and 120 kg N ha−1(N3) and four weeding treatments viz. one hand weeding at 20 DAT (W1), two hand weedings at 20 and 35 DAT (W2), three hand weedings at 20, 35 and 50 DAT (W3), weeding by Japanese rice weeder twice at 20 and 35 DAT (W4) and unweeded control (W5). The experiment was laid out in the randomized complete block design with three replications. The highest plant height (113.00 cm), number of total tillers hill−1 (8.74), number of effective tillers hill−1 (6.18), panicle length (21.98 cm), number of grains panicle−1 (114.20), grain yield (4.00 t ha−1), straw yield (5.25 t ha−1) and biological yield (9.25 t ha−1) were recorded in N2 (80 kg N ha−1) treatment. The lowest plant height (106.00 cm), number of total tillers hill-1 (7.20), number of effective tillers hill−1 (5.00), panicle length (20.70 cm), number of grains panicle−1 (97.60), grain yield (3.52 t ha−1), straw yield (4.46 t ha−1) and biological yield (7.97 t ha−1) were recorded from N0 (No nitrogen fertilizer control) treatment. On the other hand, the highest grain yield 4.23 t ha−1 was observed in three weedings condition because of the highest number of effective tillers hill−1 (6.81), number of grains panicle−1(111.10). The highest straw yield (5.51 t ha−1) was also found in three weeding condition. The lowest grain yield (3.40 t ha−1) was recorded in W5 (unweeded control) treatment. The lowest straw yield (4.31 t ha−1) was also observed in W5 (unweeded control) treatment because of the smallest plant (106.97 cm) and lower number of total tillers hill−1 (7.20). Therefore, 80 kg N ha−1along with three hand weedings at 20, 35 and 50 DAT may be used for obtaining the highest grain and straw yields of BRRI dhan46J. Bangladesh Agril. Univ. 16(1): 12-16, April 2018

Highlights

Agriculture is the largest employment sector in Bangladesh
The experiment consisted of 4 levels of Nitrogen viz. 0 kg N ha–1 (N0), 40 kg N ha–1 (N1), 80 kg N ha–1 (N2) and 120 kg N ha–1 (N3) and five weeding treatments viz. One hand weeding at 20 days after transplanting (DAT) (W1), two hand weedings at 20 and 35 DAT (W2), three hand weedings at 20, 35 and 50 DAT (W3), weeding by Japanese rice weeder twice at 20 and 35 DAT (W4) and unweeded control (W5)
It was observed that 80 kg N ha−1produced tallest plant (113.00cm), highest number of total tillers hill−1 (8.74) and highest number of effective tillers hill−1 (6.19)

Summary

Introduction

Agriculture is the largest employment sector in Bangladesh. As of 2016, it employs 47% of the total labor force and comprises 16% of the country's GDP. The performance of this sector has an overwhelming impact on major macroeconomic objectives like employment generation, poverty alleviation, human resources development and food security. Rice is the dominant staple food for many countries of the world (Mobasser et al, 2007) It is the most important food crop and a major food grain for more than one third of the world population (Zhao et al, 2011). It is an essential plant nutrient that plays a significant role in growth, yield and quality of rice. Many workers have reported a significant response of rice to nitrogen in different soils in Bangladesh (Bhuiya et al, 1989, Hussain et al, 1989 and Islam et al, 1990)

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Results

Conclusion