Nitrogen response of two high yielding rice varieties as influenced by nitrogen levels and growing seasons
| Autor: | Md. Imran Ullah Sarkar, Mosud Iqbal, Md. Rafiqul Islam, Md. Nayeem Ahmed, Aminul Islam, Afsana Jahan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Ecology
grain yield lcsh:QE1-996.5 agronomic nitrogen use efficiency food and beverages Growing season chemistry.chemical_element Geology Rice growth fertilizer nitrogen recovery efficiency straw yield High yielding Nitrogen nitrogen uptake lcsh:Geology Agronomy chemistry Yield (chemistry) lcsh:QH540-549.5 Grain yield lcsh:Ecology Nature and Landscape Conservation Mathematics |
| Zdroj: | Geology, Ecology, and Landscapes, Vol 0, Iss 0, Pp 1-8 (2020) |
| ISSN: | 2474-9508 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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