论文部分内容阅读
本文根据土壤含水量精度要求、考虑天平称重精度,提出取土样的重量。为了便于使用,绘制土壤称重天平允许误差图(如图一),根据干土重、土壤含水量可在本图上查出称重天平允许误差(即天平精确度);再应用含水量与土样重(湿土重)关系图(如图二)。求得称重精度1/10克天平的土样重,不得少于100克。用精度1/100克天平的土样重不得少于10克。
In this paper, according to the requirements of accuracy of soil moisture content, consider the weighing accuracy of the balance, proposed the weight of soil sampling. For ease of use, draw the allowable error map of soil weight scale (Figure 1). According to dry soil weight and soil moisture content, we can find the allowable error of weighing scale (ie, balance accuracy) on this figure; then apply water content and Soil sample weight (wet weight) diagram (Figure 2). Weighing accuracy of 1/10 g scale soil weight, not less than 100 grams. The soil sample with the precision of 1 / 100g should not weigh less than 10g.