• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plant and Soil >Phosphorus nutrition of rice in relation to flooding and temporary loss of soil-water saturation in two lowland soils of Cambodia.
【24h】

Phosphorus nutrition of rice in relation to flooding and temporary loss of soil-water saturation in two lowland soils of Cambodia.

机译：水稻的磷营养与柬埔寨两种低地土壤的洪水和土壤水饱和度的暂时丧失有关。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Rice plants were transplanted into pots containing soils that were either continuously flooded, maintained at field capacity or flooded and then dried to field capacity for 3 weeks during the vegetative stage. A black clay soil (Kandic Plinthaquult)and a sandy soil (Plinthustalf) from south-east Cambodia were compared with or without amendments by rice straw and P fertilizer. Under continuously flooded conditions, the growth of rice was vigorous without straw addition and there was a strong response of rice growth to the addition of P fertilizer. The soil underwent reduction, which increased pH from 4.2 to 5.5 or 6.0, in the black clay or sandy soil, respectively. By contrast, a loss of soil-water saturation 3 weeks before panicle initiation (PI)markedly impaired the growth of rice. This was not through any effect of water stress, and the growth reductions were not as strong as with continued loss of soil-water saturation from transplanting to PI. Fluctuations in soil pH and Eh corresponded closely to changes in soil-water regimes. Growth reductions were attributed to reduced shoot P levels resulting from the decline in P availability during the loss of soil-water saturation. The addition of rice straw stimulated soil reduction and lessened changes in soil pH and Eh during the loss of soil-water saturation in both soils. Straw addition enhanced P uptake by the rice plants during loss of soil-water saturation, but its beneficial effects could not be attributed to the direct addition of P, N orK to the soils. It is suggested that the application of rice straw may be effective in lessening the effects of temporary loss of soil-water saturation on rice growth in lowland rice soils by minimising the decline in P availability.
机译：水稻植株被移植到装有土壤的盆中，该土壤在营养期被连续淹没，保持在田间持水量或被淹没，然后干燥至田间持水3周。比较了柬埔寨东南部的黑色黏土（Kandic Plinthaquult）和沙质的土壤（Plinthustalf），是否使用稻草和磷肥进行了改良。在连续淹水的条件下，不添加秸秆的水稻生长势头强劲，水稻生长对磷肥的响应强烈。在黑粘土或沙质土壤中，土壤经历了还原，pH分别从4.2升高到5.5或6.0。相反，在穗开始（PI）前3周土壤水饱和度的丧失显着损害了水稻的生长。这不是通过水分胁迫的任何作用，并且其生长降低的强度不如从移植到PI造成的土壤水饱和度的持续损失。土壤pH和Eh的波动与土壤水情的变化密切相关。生长减少归因于在土壤水饱和度丧失过程中，由于可利用的磷的减少而导致的苗磷水平降低。在两种土壤中失去水饱和度的过程中，稻草的添加促进了土壤的减少，并减少了土壤pH和Eh的变化。秸秆还田增加了水稻在土壤水饱和度降低过程中对磷的吸收，但其有益效果不能归因于直接向土壤中添加磷，氮或钾。建议使用稻草可以通过最大程度地减少磷的有效利用来减轻土壤水分饱和度的暂时丧失对低地稻田水稻生长的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号