Yield of rice under water and soil salinity risks in farmers' fields in northeast Thailand
Yield of rice under water and soil salinity risks in farmers' fields in northeast Thailand
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DOI：
10.1016/j.fcr.2010.06.009
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发表时间：
2010-09-10
影响因子：
5.8
通讯作者：
Maeght, J. L.
中科院分区：
文献类型：
--
作者：
Clermont-Dauphin, C.;Suwannang, N.;Maeght, J. L.
本研究以泰国东北部农户田块为研究对象，研究了水分和土壤盐分风险对水稻产量的影响。在2005年、2006年和2007年的稻季，分别在24、16和11个农户的田里监测了一块稻田。结果强调，在2005年降雨量较少的季节，很少有地块被持续淹没。干旱对水稻产量、产量构成因素和养分吸收内效率有显著影响，而土壤轻度盐分对钾素吸收内效率的影响最大。在2006和2007年雨季，大部分农田持续淹水，与2005年相比，记录到的轻微土壤盐分不仅对IEK有显著影响，而且对水稻产量、小穗不育性和千粒重也有显著影响。干旱减产约87%，盐碱减产约20%。当盐分和水分都不受限制时，土壤养分供应足以达到文献报道的该地区水稻品种最高产量的80%左右。由于目前的农民管理难以避免干旱和盐碱化风险，因此在制定向农民提出的技术建议时应考虑到这些风险。(C)2010爱思唯尔B.V.保留所有权利。
This study focused on the variability of rice yield under water and soil salinity risks in farmers' fields in northeast Thailand. A rice plot was monitored in 24,16 and 11 farmers' fields during the rice seasons 2005, 2006 and 2007, respectively. The results emphasized that few plots were continuously submerged during the 2005 season, when rainfall was low. Drought significantly affected the rice yield, yield components and the internal efficiency (IE) of the absorbed nutrients, while slight soil salinity had the only significant effect of increasing the IE of potassium (IEK). In the very rainy 2006 and 2007 seasons, most fields were continuously submerged, and in contrast to 2005, the slight soil salinity that was recorded had significant effects not only on IEK, but also on rice yield, spikelet sterility and 1000-grain weight. The yield decrease due to drought was about 87% and that due to salinity was 20%. When neither salinity nor water were limiting, the soil nutrient supply was high enough to achieve about 80% of the maximum yield reported in the literature for the rice cultivar in this area. As both drought and salinity risks are hardly avoided by the current farmers' management they should be taken into account in the way technical recommendations to farmers are formulated. (C) 2010 Elsevier B.V. All rights reserved.