肥液间歇入渗土壤湿润特性实验研究

通过肥液间歇和连续入渗实验,分析了肥液间歇入渗土壤湿润特性。结果表明,肥液间歇入渗湿润锋运移速度较连续入渗慢,并随周期数的增加而减小;分析了肥液间歇入渗湿润锋运移的分段模型,提出了由连续入渗湿润锋运移参数计算间歇入渗湿润锋运移距离的简化模型,实例计算表明该方法简单有效;对比了肥液间歇入渗和连续入渗土壤含水量的分布,肥液间歇入渗土壤含水量分布较连续入渗均匀,相同深度土层中入渗水量占总入渗量的比例较大。

Soil Wetting Characteristics under Intermittent Infiltration of Fertilizer Solution

Soil wetting characteristics under intermittent infiltration of fertilizer solution were analyzed based on indoor experimental data to study the intermittent infiltration characteristics under surge fertigation.The results indicated that wetting front under intermittent infiltration of the fertilizer solution moved slower than under continuous infiltration and the speed decreased with cycle number.Piecewise model for calculating transport distance of the wetting front under intermittent infiltration of fertilizer solution was analyzed,and the simple model based on continuous infiltration data of fertilizer solution was suggested,the example calculation indicates that the method is simple and effective.Soil water content under intermittent infiltration of fertilizer solution is more evenly distributed than continuous infiltration and the proportion of infiltration quantity increased at the same wetting depth.