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首页> 外文期刊>Indian Journal of Weed Science >Effect of depth of water submergence and nitrogen levels on weed dynamics and yield of transplanted rice
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Effect of depth of water submergence and nitrogen levels on weed dynamics and yield of transplanted rice

机译：淹水深度和氮水平对移栽水稻杂草动力学和产量的影响

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摘要

Weeds are one of the most important biological constraints in rice. Yield losses due to uncontrolled weeds in transplanted rice have been reported to be 15.40 percent depending upon weed species and their density (Mishra, 1997). Soil moisture and nitrogen are known to influence the growth of crops and weeds. Therefore, appropriate water and nitrogen management are important for controlling weeds in transplanted rice. A pot culture experiment was conducted during rainy season of 2000 at National Research Centre for Weed Science, Jabalpur to find out the effect of depth of water submergence and nitrogen levels on weeds and yield of transplanted rice (cv. Kranti). Treatments consisting of four levels of water submergence (saturation, 2.5, 5.0 and 7.5cm) and four levels of nitrogen (0, 40, 80 and 120 kg ha~(-1)) were replicated thrice in factorial completely randomized design (CRD). Depths of water submergence were maintained by filling the ceramic pots (0.1256 m~2 surface area and 75 cm depth) withsoil. The soil of the experimental pot was clay loam in texture, low in available N (230 kg ha~(-1)), medium in available P (18.5 kg ha~(-1)), and high in available K (320 kg ha~(-1), with organic carbon 0.53 percent and pH 6.7. Puddling in pots was done by hand. Four hills pot~(-1) (two seedlings hill~(-1)) were planted on June 24, 2000. Fifty per cent of nitrogen (60 kg ha~(-1)) and full dose of recommended phosphorus (60 kg ha~(-1)) and potassium (40 kg ha~(-1)) were given before transplanting. Remaining amount of N (60 kg ha~(-1)) was top dressed in two splits (30 kg ha~(-1) at tillering and 30 kg ha~(-1) at panicle initiation stage). Weeds were counted at 30 and 60 days after transplanting (DAT).
机译：杂草是水稻中最重要的生物学限制之一。据报道，由于杂草种类及其密度的原因，水稻插穗中不受控制的杂草导致的产量损失为15.40％（Mishra，1997）。已知土壤水分和氮会影响农作物和杂草的生长。因此，适当的水和氮管理对控制水稻插秧的杂草很重要。在2000年的雨季期间，在贾巴尔普尔国家杂草科学研究中心进行了盆栽试验，以了解水淹深度和氮含量对插秧稻（cv。Kranti）的杂草和产量的影响。在阶乘完全随机设计（CRD）中重复三次处理，包括四级水浸（饱和度，2.5、5.0和7.5cm）和四级氮（0、40、80和120 kg ha〜（-1））。 。通过将陶瓷锅（0.1256 m〜2的表面积和75 cm的深度）装满土壤，可以保持水的浸入深度。实验盆的土壤质地为粘土壤土，有效氮含量低（230 kg ha〜（-1）），中等有效磷含量（18.5 kg ha〜（-1）），有效钾含量高（320 kg） ha〜（-1），有机碳含量为0.53％，pH值为6.7，用手在盆中倒水，并于2000年6月24日种植了四个丘陵花盆（-1）（两个育苗丘陵（-1））。移栽前先给予氮的百分之五十（60 kg ha〜（-1））和全剂量的推荐磷（60 kg ha〜（-1））和钾（40 kg ha〜（-1））。 N（60 kg ha〜（-1））的氮肥分两批撒种（分till期30 kg ha〜（-1）和穗萌发期30 kg ha〜（-1）），杂草数为30和移植后60天（DAT）。

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