Rainwater, soil and nutrient conservation in rainfed rice lands in Eastern India
Rainwater, soil and nutrient conservation in rainfed rice lands in Eastern India
复制标题
印度东部雨养稻田的雨水、土壤和养分保护
DOI：
10.1016/s0378-3774(98)00052-3
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发表时间：
1998
影响因子：
6.7
通讯作者：
S. Singh
中科院分区：
文献类型：
--
作者：
A. Mishra;A. K. Ghorai;S. Singh
在旱稻生态系统中，最大限度地涵养雨水可以减少作物的补充灌溉用水和集水区的排水需求。在不同堰高（6- 30 cm，每隔4cm）的堤围稻田上，三年的试验研究结果表明，堰高为6和30 cm的堤围区，分别可蓄存56.75%和99.5%的降水。6cm和30 cm堰高试验区在一个种植季的径流泥沙流失量分别为347.8kg/ha和3.3kg/ha。稻田径流中的凯氏氮流失量为4.23 ~ 0.17kg/ha（6cm堰高），速效钾流失量为2.20 ~ 0.04kg/ha（30 cm堰高）。不同堰高的稻田蓄水对水稻产量差异、叶面积指数等生物学性状无显著影响。18 cm及以上堰高区的灌溉需水量为6cm堰高区的一半。考虑到节约雨水、沉积物和养分以及最大限度地减少灌溉需求等方面，认为22- 26厘米的堤坝高度适合布巴内斯瓦尔地区的稻田。
In rainfed rice ecosystem, conservation of rainwater to maximum extent can reduce the supplemental irrigation water requirement of the crop and drainage need of the catchment. The results of 3 years of experimental study on the above stated aspects in diked rice fields with various weir heights (6–30cm at an interval of 4cm) revealed that about 56.75% and 99.5% of the rainfall can be stored in 6 and 30cm weir height plots, respectively. Sediment losses of 347.8kg/ha and 3.3kg/ha have been recorded in runoff water coming out of 6cm and 30cm weir height plots, respectively in a cropping season. Similarly, total Kjeldahl nitrogen (TKN) loss in runoff water from rice field ranged from 4.23kg/ha (6cm weir height plots) to 0.17kg/ha (26cm weir height plots) and available potassium loss ranged from 2.20kg/ha (6cm weir height plots) to 0.04kg/ha (30cm weir height plots). Conservation of rainwater in rice fields with various weir heights could not create any significant impact on grain yield differences, leaf area index and other biometric characters. Irrigation requirement of 18cm and above weir height plots was found to be half of the requirement of 6cm weir height plots. Keeping in view the aspects of conserving rainwater, sediment and nutrient and minimizing irrigation requirement, 22–26cm of dike height is considered to be suitable for rice fields of Bhubaneswar region.