Effect of nitrogen management and seedling raising methods on the productivity of Aus rice under tidal ecosystem of Bangladesh

A. Sarker, S. Samanta, G. Saha
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Abstract

The low productivity of Aus rice in the tidal ecosystem of Bangladesh is mainly due to the difficulties in nitrogen (N) management under high tidal water along with unavailability of irrigation water during the onset of rice cultivation. Our present study demonstrated how the productivity of Aus rice could be improved using appropriate seedling raising methods and N management practices. The study was laid out in split plot design consisting two factors viz., seedling raising methods (wet seed bed and dry seed bed) and N management practices (six N treatments) in three replications. Results indicated that both the seedling raising methods and N management practices had significant effect on all the yield contributing characters of transplanted Aus rice under tidal condition. Specifically, the combination of seedlings raised in wet seed bed and fertilized with urea super granule (USG) at 10 days after transplanting (DAT) i.e., N 3 W showed the best values for plant height (110.33cm), number of effective tillers hill -1 (14.60), days required 50% flowering (53.00 DAT), days to maturity (84.33 DAT), panicle length (23.37 cm), number of filled grain panicle -1 (88.13), 1000-grain weight (43.17 g), grain yield (4.62 tha -1 ), straw yield (6.07 tha -1 ), biological yield (10.67 tha -1 ), and harvest index (43.17%). However, in considering the productivity/ grain yield, besides N 3 W, the whole urea application at land preparation along with wet seed bed (N 1 W) and USG application along with dry seed bed (N 3 D) also produced statistically similar results (p<0.01) and thus all these three combinations may be practiced for improving productivity and ensuring horizontal expansion of Aus rice in the tidal ecosystem of Bangladesh.
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氮肥管理和育苗方式对孟加拉潮生态系统下澳稻生产力的影响
孟加拉国潮汐生态系统中澳大利亚水稻的低生产力主要是由于在高潮汐条件下氮管理困难以及水稻种植初期缺乏灌溉用水。本研究表明,采用适当的育苗方法和氮素管理措施可以提高澳大利亚水稻的生产力。试验采用分畦设计,包括育苗方式(湿苗床和干苗床)和施氮方式(6个施氮处理)2个因素,分3个重复。结果表明,育苗方式和氮素管理对潮地条件下移栽水稻的产量贡献性状均有显著影响。具体而言,在移栽后10 d (DAT),即氮3w育苗和尿素超粒(USG)施肥组合的株高(110.33cm)、有效分蘖数-1(14.60)、50%开花所需天数(53.00 DAT)、成熟天数(84.33 DAT)、穗长(23.37 cm)、灌浆穗数-1(88.13)、千粒重(43.17 g)、籽粒产量(4.62 tha -1)、秸秆产量(6.07 tha -1)、生物产量为10.67(-1),收获指数为43.17%。然而,在生产力/产量方面,除氮3w外,整地全施尿素加湿苗床(氮1w)和施用USG加干苗床(氮3d)也产生了统计学上相似的结果(p<0.01),因此这三种组合都可以用于提高生产力和确保孟加拉国潮生态系统中Aus水稻的水平扩张。
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