The soil testing and fertilizer application methods popularized in various regions have summarized three types of six methods: the first type is the geographical division method; the second type is the target production method, including the nutrient balance method and the ground force difference subtraction method; the third type is the field test method. Including fertilizer effect function method, nutrient abundance index method, NPK ratio method. Bathroom Products,Bathroom Bamboo Fiber Toothbrush,Wood Water Cup,Biodegradable Charcoal Toothbrush Yangzhou Tongfun Red International Trading Co,Ltd. , https://www.i-ecbio.com
First, the geographical division (level) with the method of geographical division (level) with the method is the use of soil surveys, farmland fertility surveys and local field test data, the soil according to fertility levels divided into several levels, or draw a field of fertility equal, As a formula area, re-use data and field trial results, combined with local practical experience, to estimate the type of fertilizer and the appropriate amount of fertilizer in the formula area. The advantage of this method is that it is relatively simple, and the amount and measures of fertilizer proposed are close to the local experience. The method is simple and the people are easy to accept. Disadvantages are the limitations, each recipe can only be adapted to areas with small differences in production levels, and rely on more general experience, not specific to the specific field. In the promotion process, we must combine experimental demonstrations and gradually expand the proportion of scientific testing methods and theoretical guidance.
Second, the target yield allocation method The target yield allocation method is based on the composition of crop yield, the principle of nutrient supply from both the soil itself and fertilization to calculate the amount of fertilizer. Determine the target output, and the amount of nutrients needed to achieve this output. Then calculate the amount of nutrients the crop needs to supplement, in addition to the nutrients supplied by the soil, and finally determine how much fertilizer to use. Including nutrient balance and subtraction.
Third, the field test method The principle of the field test method is to conduct multi-point field trials by simple single comparison, or use more complex orthogonal, regression and other experimental design, so as to select the optimal treatment to determine the fertilizer application amount.
1. Fertilizer effect function method: A single-factor, two-factor or multi-factor multi-level regression design is used to conduct a site test, and the yields obtained from different treatments are subjected to mathematical statistics to determine the fertilizer effect equation between yield and fertilizer application. According to its functional relationship, it can be seen intuitively that different elements of fertilizers have different yield-increasing effects, as well as the combined effects of various fertilizers and fertilizers. The upper and lower limits of fertilization are determined, and the amount of economic fertilizer is calculated as the basis for the actual amount of fertilizer. The advantage of this method is that it can objectively reflect the single and comprehensive effects of fertilizers and other factors. The accuracy of fertilization is high and accords with the actual situation. The disadvantage is that the region has strong limitations, and different soils, climates, farming practices, and varieties need to be arranged in different experiments. .
2, nutrient abundance index method: This is a kind of field test method. This method uses the correlation between the measured values ​​of soil nutrients and crop nutrient absorption. Through field trials of different crops, based on the yield classifications obtained under different soil nutrient values, the measured value of the soil is determined by a certain degree of difference. A nutrient deficit and a checklist of the amount of fertilizer should be made. In practical applications, as long as the soil nutrient value is measured, the fertilizer application amount can be determined in stages from the control search table.
3, nitrogen, phosphorus, potassium ratio method: This method is also a field test method. The principle is to obtain the best ratio of various nutrients under different yields of a certain crop on the soil in a certain area through field experiments. Then, by quantifying one kind of nutrients, the proportion of various nutrients should be used. , To determine the amount of fertilizers for other nutrients, such as nitrogen, phosphorus, potassium, phosphorus nitrogen, potassium and nitrogen.