在一个干燥期中，样本的含水率的最小值也有明显的规律。素土的最小含水率最

In a dry period, the minimum moisture content of the sample also has an obvious law. The minimum water content of plain soil is the smallest, and the minimum water content of other samples increases with the addition of biochar. Due to the lack of lignin materials in the PMB raw materials ((Das and Sarmah 2015), the two unmodified biochars do not have the same properties. Therefore, the minimum moisture content of the peach shell biochar sample is greater than the minimum moisture content of the pig manure biochar sample , The increasing trend is more obvious (see Figure 8(b)).

During a dry period, the minimum water content of the sample is also significantly regular. The minimum water content of vegetarian soil is the smallest, and the minimum water content of other samples increases with the addition of biochar. Due to the lack of ligand materials in PMB raw materials (Das and Sarmah 2015), the two unaltered biochars do not have the same properties. Therefore, the minimum water content of the peach shell biochar sample is longer than that of the pig manure biochar sample, and the increasing trend is more obvious (see Figure 8 (b)).

In a drying period, the minimum moisture content of the sample also has obvious regularity. The minimum moisture content of plain soil is the smallest, and the minimum moisture content of other samples increases with the increase of biochar content. Due to the lack of lignin in PMB raw materials (DAS and sarmah 2015), the two unmodified biochars do not have the same properties. Therefore, the minimum moisture content of peach shell biochar sample is larger than that of pig manure biochar sample, and the increasing trend is more obvious (see Figure 8 (b)).<br>