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首页> 外文期刊>Soil Science and Plant Nutrition >Effects of single and successive applications of rice husk charcoal on paddy soil carbon content and rice productivity during two cropping seasons
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Effects of single and successive applications of rice husk charcoal on paddy soil carbon content and rice productivity during two cropping seasons

机译：稻壳木炭单次及连续应用对两种苗季碳含量和水稻生产率的影响

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摘要

A two-year field experiment was conducted to evaluate residual and cumulative effects of rice husk charcoal (RC) application on physicochemical soil properties and rice productivity in an Andosol paddy field. Three RC application rates, 10, 20, and 40 Mg ha(-1), one rice husk (RH) application rate of 20 Mg ha(-1), and a control with no application of RC or RH were laid out in the first year of the experiment. In the second year, the experimental plot was divided into halves: one with the same application rates as in the first year (successive applications) and the other without additional RC or RH (single application). Significant impacts of RC application were observed from the first year on soil bulk density, porosity, carbon (C) content, and carbon-to-nitrogen (C/N) ratio. Soil C content was directly proportional to the amount of RC application over the 2 years showing that the C derived from RC was markedly recalcitrant in soil compared to that from RH. The increased C was present not only in the plow layer but also spread over the top 20 cm of paddy field. As compared to the control, successive RC applications at 20 Mg ha(-1) increased soil C contents by 12.7g kg(-1) and 14.4g kg(-1) in the 0-10 cm and 10-20 cm layers after two rice seasons, respectively. Successive RC applications significantly increased straw weight and panicle number, partly due to the increased Si uptake by rice plants. However, grain yield did not significantly differ among the treatments because RC application decreased 1000-grain weight. We speculate that the reduction in 1000-grain weight may be due to immobilization of available N at the reproductive stage under high soil C/N ratio conditions. This suggests the need for N fertilizer top-dressing to obtain the potential yield in the RC-applied fields. Furthermore, the diminishing residual effects of RC application on the rice growth and yield parameters in the second season suggest that successive, or applications at an interval of 2-3years, would be required to maintain the higher Si deposits in plants, thereby sustaining rice productivity.
机译：进行了两年的田间实验，以评估水稻壳炭（RC）对稻稻稻田稻米物理化学土壤性质和水稻生产率的残留和累积效应。三个RC施用速率，10,20和40 mg HA（-1），一个稻壳（RH）施用率为20 mg ha（-1），并在没有施用RC或RH的控制实验的第一年。在第二年，实验绘图分为一半：一个具有与第一年（连续应用程序）相同的申请率的速率，另一个没有额外的RC或RH（单一应用）。从第一年的土壤堆积密度，孔隙率，碳（C）含量和碳 - 氮（C / N）比例从第一年观察到RC应用的显着影响。在2年内，土壤C含量与RC施用量成正比，显示源自RC的C与RH的rc衍生的C批量标记。增加的C不仅存在于犁层中，而且还存在于稻田的前20厘米上。与对照相比，在20mg HA（-1）的连续RC应用在0-10cm和10-20cm层中增加了12.7g kg（-1）和14.4g kg（-1）的土壤c含量增加两个米饭季节。连续的RC应用显着增加了稻草重量和穗数，部分原因是水稻植物的增加的Si吸收。然而，谷物产量在治疗中没有显着差异，因为RC施用减少了1000粒重量。我们推测，1000粒重量的降低可能是由于在高土壤C / N比条件下生殖阶段的可用N的固定。这表明需要N肥料的敷料，以获得RC应用领域的潜在产量。此外，第二季中RC应用对水稻生长和产量参数的递减递减表明，在2-3年的间隔中，需要连续，或应用，以维持植物中较高的Si沉积物，从而维持水稻生产率。

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