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干物质的测定是作物生长分析中的最基本内容之一。传统的测定方法有两种,一是烘干称重法,二是风干称重法。与风干称重法相比,烘干法易于保持固定的标准,误差小速度快。然而对于高秆作物尤其是玉米、高粱等作物生长中后期的干物质测定,常由于小区数量多样品数量大而给烘干工作带来较大的困难。
Determination of dry matter is one of the most basic elements of crop growth analysis. There are two traditional measurement methods, one is drying weighing method, and the other is air-dried weighing method. Compared with the air-dried weighing method, the drying method is easy to maintain a fixed standard, the error is small and fast. However, for the determination of dry matter in high-stalk crops, especially corn, sorghum and other crops in the later period, it is often difficult to carry out the drying work due to the large number of samples in a large number of plots.