Nitrogen response of two high yielding rice varieties as influenced by nitrogen levels and growing seasons

Geology, Ecology, and Landscapes

Md. Imran Ullah Sarkar¹  Aminul Islam¹  Mosud Iqbal¹  Md. Nayeem Ahmed¹  Afsana Jahan¹  Md. Rafiqul Islam¹ 

[1] Bangladesh Rice Research Institute;

关键词: nitrogen uptake;    agronomic nitrogen use efficiency;    fertilizer nitrogen recovery efficiency;    grain yield;    straw yield;   

DOI  :  10.1080/24749508.2020.1742509

来源: DOAJ

【 摘 要 】

Proper nitrogen (N) management of high yielding rice varieties is crucial for obtaining their potential yield benefit. In this study, we compared the effect of different N rates on rice growth, yield, and N use efficiency of two high yielding rice varieties (BRRI dhan58 and BRRI dhan75) in a Boro (dry season)-fallow-T. Aman (wet season) cropping pattern. The N rates were: 0, 25, 50, 75, 100, 125, 150 and 175 kg ha−1 which were assigned in randomized complete block design with three replications. In Boro season, BRRI dhan58 showed higher response to applied N compared to BRRI dhan75 in T. Aman season. The calculated optimum N dose to maximize yield of BRRI dhan58 and BRRI dhan75 were 142 kg ha−1 and 82 kg ha−1, respectively. The agronomic N use efficiency and fertilizer N recovery efficiency were comparatively higher in BRRI dhan58 grown in Boro season than BRRI dhan75 grown in T. Aman season, while in both seasons, the N use efficiencies decreased with increased N rates. This study results suggest that variety-specific N fertilization with respect to growing season is the best N management practice to maximize rice yield avoiding the excess use of N fertilizer.

【 授权许可】

Unknown