Effects of puddling on percolation and rice yields in rainfed lowland paddy cultivation: case study in Khammouane province, central Laos.
Effects of puddling on percolation and rice yields in rainfed lowland paddy cultivation: case study in Khammouane province, central Laos.
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DOI：
10.4236/as.2013.48052
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发表时间：
2013-01-01
期刊：
影响因子：
--
通讯作者：
Kashiwagi, J.
中科院分区：
文献类型：
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作者：
Fujihara, Y.;Yamada, R.;Kashiwagi, J.
我们研究了雨养低地水稻种植中的浸坑对渗滤和水稻产量的影响。我们选择了老挝中部甘蒙省的一个研究村，从高到低设置了非搅拌区和搅拌区。即使小心地进行积水，在降雨量很少的情况下，田地里的积水也消失了。此外，在水稻生长后期，渗滤液急剧增加。因此，仅通过泡水很难克服干旱胁迫。我们还比较了非搅拌区和搅拌区的水条件。在沿溪高位和低位的积水地中，7月份积水地无积水的天数少于非积水地，表明移栽日期可能不同。我们试图估计插秧日期对水稻产量的影响，发现提前15天插秧可使水稻产量增加0.5吨/公顷。此外，产量增加带来的利润大大超过了搅拌成本，导致收入明显增加。由于移栽日期对地下水位较高的田地没有影响，因此对于积水程度不严重的稻田来说，积水是有效的。
We investigated the effects of puddling on percolation and rice yields in rainfed lowland paddy cultivation. We selected a study village in Khammouane province, central Laos, and set up non-puddling and puddling plots from high to low positions. Even when puddling was conducted carefully, the ponding water in the plots disappeared in the case of little rainfall. Further, percolatifons during the later periods of rice growth increased drastically. Therefore, it is difficult to overcome drought stresses only by conducting puddling. We also compared the water conditions in the non-puddling and puddling plots. In the puddling plots at high position and low position along a stream, the number of days without ponding water in the puddling plots was less than that in the non-puddling field in July, suggesting the possibility of a different transplanting date. We tried to estimate the effects of transplanting date on the rice yields and found that transplanting 15 days earlier leads to an increase of 0.5 t/ha in the rice yields. Moreover, the profits from the increased yields exceed the puddling costs considerably, leading to a definite increase in income. Because the transplanting date has no effects in the fields with high ground water, puddling is effective in paddy fields where ponding does not occur to a significant degree.