In the seedling stage of various plants, the samples taken out at multiple points need not be divided into small ones. After fixation and drying at a low temperature of about 60°C, they can be used as test samples. However, for every other growing period, especially the mature period, due to the large plant height and the disparity of nutrients in various parts, it must be subdivided by the sampler.
Test the seeds of various plants. Samples of seeds taken from fields, plots, potted plants or some fixed plants can be sampled by sub-samplers several times. Corn may also not be threshed. On the selected ear of corn, the original sample is composed of a row of several rows, and then the test sample is taken from the middle of the box to verify and compare.
The advantages of using the above sampler's decimation method are:
(l) After sample separation, the amount of sample is greatly reduced, saving manpower, material resources, and time for cutting and crushing the sample.
(2) Test samples taken in proportion include all parts of the plant in proportion.
(3) Samples of mature plants, rice, wheat can be divided into two samples of seed and stem, rice hull or wheat bran can be included in the stems and leaves. Crops such as corn or legumes can be divided into three test samples of seed, leaf, and stem. Corn cobs, loquat leaves, or beans can be included in the stem. If roots are to be studied for nutrient content, roots can also be composed. An assay sample.
Now the study of various quality of crop seeds, such as the analysis of proteins, various elements and starches, as well as the research on the various genetic characteristics and environmental relations in seeds, etc., require the analysis of samples in advance. For the seed samples, The analysis is inseparable from the separation and testing of a large number of samples by the sampler. There is a great relationship between whether the sample is properly separated and whether the measurement result can directly reflect the crop. Therefore, the separation technology of the various seed samples using a sampler is a need for the development of modern laboratory research.