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测定混合牧草样品中的死活体需要手工分离和专门的实验室过程。根据牧草死活体在组分间干物质含量上的差异,设计组分差异法可用来测定混合牧草中死活体的相对比例。其目的是在野外条件下用组分差异法评价高草和混合草地植被的特性。用这种方法所估测的活体比值对混合物中干物质的含量反应非常敏感,但死体部分对变量间差异的增加不太敏感。如果牧草表面完全干燥后再采样,则采样时机通常与牧草死活体的干物质含量无关。在大的实验单元中测定干物质时所建议的采样数目为:混合体40～50个,活体10个,死体5个,在4次田间试验中,用手工分离法和组分差异法所测得的牧草活体的百分比平均值相差1.6个百分点,差异不显著(P>0.10)。在测定牧草死活体时组分差异法是速度快且精确的一种方法。
Determination of live dead in mixed forage samples requires manual separation and specialized laboratory procedures. According to the differences in the dry matter content of dead and living parts of forage among the components, the design component difference method can be used to determine the relative proportions of dead and living parts in mixed forage. Its purpose is to evaluate the characteristics of high-grasses and mixed-grass vegetation using the compositional difference method under field conditions. The live ratio estimated in this way is very sensitive to the dry substance content of the mixture, but the dead body part is less sensitive to the increase in the difference between the variables. If the pasture surface is completely dry before sampling, the timing of the sampling is usually not related to the dry matter content of live and dead pastures. The recommended number of samples for the determination of dry matter in a large experimental unit is 40 to 50 mixes, 10 live and 5 dead, measured in 4 field trials by manual separation and compositional differences The average percentages of live pasture were 1.6 percentage points, with no significant difference (P> 0.10). The method of component differentiation in the determination of live and dead forage is a fast and accurate method.