Comparative Experiments about Routine Analysis Effected by Different Sampling Times

When collecting and reporting on a soil sample, it is common to only consider the soil's lateral and vertical non-homogeneity but to ignore the temporality of the soil's nutrient's dynamic change. By analyzing and comparing different samples of one crop collected at different times, this paper illustrates that different sampling times have some effect on measured values by routine analysis. For most analyzing items, however, it will not cause large sampling errors. This shows that it is possible to collect large samples in advance and to formulate fertilizer formula beforehand.