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Target production is planned output and is the most primitive basis for fertilizer quantification. The target production is not estimated empirically, or the absolute high yields already achieved in other regions are the target production in the region, but are determined by the level of soil fertility. In the experiment of crop yield dependence on soil fertility, the two data of the comprehensive index X of soil fertility (the yield of blank field) and the highest yield Y of fertilization can be combined in pairs. After statistical analysis, between the two, There is also a certain functional relationship, that is, Y = X / (a ​​+ bX) or Y = a + bX, which is the empirical formula for crop production. It is generally recommended to use the average yield of the local crop for the first three years, or the output of the year with the highest yield in the first three years and the natural conditions such as the climate as the soil fertility index, and then increase by 10%, up to 15%. , is intended to be the target output of the year.
How to collect soil samples?
The collection of soil samples or soil samples is an important part of the soil analysis work, and it is a prerequisite for the correctness of the analysis results. In other words, the sampled area should be representative and the soil to be taken should be representative. In order to understand the nutrient supply in the soil layer during the growing period of the crop, 20 cm of soil was taken without the need to dig the pit. For crops with deep roots, the soil layer may be appropriately deepened. The number of samples may be determined according to the area of ​​the formula area, usually not less than 20 points, and the test field is not less than 5 points, and the serpentine point method is subject to . After the sampling point is delineated, the soil sample of the specified depth is excavated by a cylindrical soil picker or a small soil shovel. Collect and analyze soil samples of trace elements, using stainless steel or bamboo wood shovel. The soil samples collected are all mixed first, then the number of samples is reduced by the quadruple method, leaving about 1 kg, and the others are discarded. The obtained soil is placed in a bag, and the label is placed inside and outside the bag, indicating the sampling location, date, sampler, and analysis-related content.
How to collect crop samples?
The nutrient content of each organ in the crop varies greatly, not only in different growth periods, but also varies within one day. Therefore, when collecting samples, the effects should be fully considered according to the purpose and requirements of the analysis. Nutrient content factors. Samples used for comparison with each other should be collected at the same time, and the sampling site should be fixed. Since different organs of the crop are sensitive to different elements, the sampling site can be selected by referring to various crop diagnostic sampling sites in the nutritional diagnosis. At the same time, sampling should consider randomness and representativeness. The sample after sampling should be marked and treated in time to prevent changes in nutrient elements. Fresh samples should be killed in a blast oven at 105 ° C for 10-30 minutes, then dried in a 60 ° C blast oven for 4-8 hours. . All kinds of smoke and dust pollution should be avoided during the treatment. The dried sample can be directly pulverized in a plant mill, and all samples are passed through a 0.3-0.5 mm aperture sieve, then bottled or bagged, labeled, and stored in a cool dry place. When performing trace element analysis, a stainless steel pulverizer or a porcelain mortar is used for grinding.
How to collect soil test formula fertilization samples
How is the target output determined?
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