The Relationship between Electrical Conductivity of rrigation Water and Soil Saturation Extract in Changhua and Yunlin Rice Fields
Date Issued
2006
Date
2006
Author(s)
Lin, Sheng-Chi
DOI
zh-TW
Abstract
In general, when we discuss the influence of salinity on crops, the most frequent index used is the electric conductivity(EC) of irrigation water in stead of the soil extract. This study constructes the salt balance model of rice fields through the simulation of water balance equation to understand the relationship between the EC of the irrigation water(ECi) and the saturated soil extract(ECs). The object of the study is that the change of the accumulated salt soil under the soil condition with full of water for a long period of rice growth. The model is verified by both ECs and ECi measured in situ in Changhua and Yunlin county. According to the estimation of crops Evaportranspiration based on the local condition of climate and percolation, the ratio range (ECi/ECs) of calculation of model is 0.59-0.72, and the ratio range (ECi/ECs) measured in situ is 0.61-0.76.
In view of the statistic analysis from twice sampling soils in the rice fields, the content of the accumulated salt in soil doesn’t reach its capacity. If the rice yield doesn’t drop in production under the same irrigation management, the study will suggest that the most allowable maximum ECi specifically are 1.83 dS/m in sandy-loam, 1.70 dS/m in silt-loam and 1.57 dS/m in clay-loam. In the future, these indexes will be reference materials when we want to adjust the irrigation water quality standard in Taiwan.
Subjects
電導度
淋洗率
灌溉水
Electrical conductivity
Leaching fraction
Irrigation water
SDGs
Type
thesis
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