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首页> 外文期刊>Vadose zone journal VZJ >Soil Water Dynamics of Shallow Water Table Soils Cultivated With Potato Crop
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Soil Water Dynamics of Shallow Water Table Soils Cultivated With Potato Crop

机译：用土豆作物栽培浅水表土壤水动态

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摘要

Agricultural areas with shallow water tables usually rely on upward soil water flux to supply crop evapotranspiration (ETc). The study objective was to determine optimum water table levels for coarse-textured soils cultivated with potato (Solanum tuberosum L.) by estimating the upward soil water flux under different irrigation methods. Potato was grown under seepage, subirrigation with tile drainage, subsurface drip irrigation (SDI), and sprinkler irrigation. Irrigation zones were classified as sandy soil with low soil organic matter (SOM) and high bulk density (B-d), or loamy sand soil with high SOM and low B-d. Upward soil water flux supplied enough water to the root zone to meet ETc when the water table was at the 69-cm depth for loamy sand soils under seepage, and 42 and 45 cm for sandy soils under subirrigation and SDI, respectively. The sprinkler-irrigated area had no control over the water table, whereby the cumulative contribution of upward water flux still averaged 6.3 cm, suggesting that irrigation rates could be reduced if the water table is controlled and upward flux accounted for in the crop water balance. Rainfall introduces flooding risks and crop losses, but these risks are minimized with management. The water table elevation/precipitation ratio was 34.4 and 25.6 cm cm(-1) of rain for loamy sand and sandy soils. After precipitation, the water table returned to the original levels twice as fast under subirrigation than with other methods given improved drainage capacity. Soil characteristics, irrigation method, upward water flux, and proper water table management are important factors for maintaining ideal soil moisture conditions in the crop root zone, minimizing flooding risk.
机译：浅水桌子的农业领域通常依靠向上土壤水通量来供应作物蒸散（ETC）。研究目的是通过估计不同灌溉方法下的向上土壤水通量，确定用马铃薯（Solanum Tuberosum L.）培养的粗糙纹理土壤的最佳水位水平。马铃薯在渗漏，瓷砖排水，地下滴灌（SDI）和喷洒灌溉等渗水。灌溉区被归类为具有低土壤有机物质（SOM）和高堆积密度（B-D）的沙质土壤，或具有高SOM和低B-D的壤土砂土。向上的土壤水通量向根区供应足够的水，以便在渗水泡沫砂土处于69厘米深度时，分别在泡沫砂土下的69厘米的深度下，在药物和SDI下进行砂土的42和45厘米。喷洒器灌溉区域没有控制水位，由此向上水通量的累积贡献仍然平均为6.3厘米，这表明如果在作物水平衡中控制和向上的通量占额外的通量，则可以减少灌溉速率。降雨介绍了洪水风险和作物损失，但这些风险与管理层都最大限度地减少。水台升降/沉淀比为植物和沙质土壤为34.4和25.6厘米厘米（-1）雨。沉淀后，水表返回到原始水平，在放水上的两倍快，而不是其他方法给出了改进的排水能力。土壤特性，灌溉方法，向上水通量和适当的水位管理是维持作物根区理想土壤水分条件的重要因素，最大限度地减少洪水风险。

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