Soil testing method of formula fertilization When the Ministry of Agriculture promoted “test soil fertilization†throughout the country, it summarized the experiences of various provinces (cities) and summarized them into three types of “fructificationâ€. Mining Machine Parts,Spare Parts For Crusher,High Manganese Spare Parts,Stone Crusher Parts ZHEJIANG FULE MINING MACHINERY CO., LTD , https://www.fulemini.com
(I) Partition method of soil fertility First, the plots are divided into different grades or districts according to the conditions of fertility, and then formula fertilization is conducted according to the characteristics of plots of different grades. The process requires the use of a soil tester to conduct zoning and zoning according to topography, landforms and soil texture, crop conditions, etc. in a larger area, and then divide each area into several soil grades, each with a land-use rating. As a recipe area.
According to Mu Chengchuang et al. (1995) in the book “Formula Fertilizer for Crops,†the formula fertilization for wheat in Henan province first divided the province into low-yield formula areas and hessian soils in eastern Henan according to geographical location, topography, and soil texture. There are six wheat formula areas, such as medium and low-yield formula areas in West Dryland, low-yield formula areas in Yuzhongnan Shajiang Black Soil, high-yield formula areas in North Henan, rice-wheat rotation formula in South Henan, and formula area in Nanyang Basin. In each formula area, a number of grades are further divided according to the soil strength grades, and fertilization formulas and implementation techniques are formulated for their fertility characteristics.
(II) Target Output Allocation Method
1. Nutrient Balance Method The amount of fertilizer required by the target yield is reduced by the amount of soil fertilizer, and the difference is partially supplemented by fertilization so that the balance between the amount of nutrients required for the target crop yield and the nutrient content of the fertilizer supply can be reached. The formula is:
Fertilizer requirement amount = target yield × unit yield nutrient absorption amount - soil nutrient measurement value × 0.15 × correction coefficient / (nutrient content in fertilizer × fertilizer utilization rate in the season)
2. Subtraction of fertility difference Where there is no condition for soil testing, the yield of white-area crops in field trials, known as blank yield, can be used to represent fertility production. The difference between the target output minus the productivity of the ground and the nutrient absorption per unit of output is the amount of nutrients needed to meet the supply of fertilizer. The formula is:
Fertilizer requirement amount = (target output - blank yield) × unit yield nutrient absorption amount / (nutrient content in fertilizer × fertilizer utilization rate in the season)
(C) field test method
1. Fertilizer effect function method In the field plot experiment, the difference in crop yields resulting from different fertilizer uses is called the fertilizer effect. This relationship is expressed mathematically and is the fertilizer effect function agenda, which can be obtained through the calculation of the agenda. A reasonable amount of fertilizer for a crop in the field.
So far, obtaining fertilizer use information through field fertilizer tests is the most basic method for recommending fertilization. All other methods should use it as a reference standard. Fertilizer tests in the field are expensive and time-consuming. The number of trial points is small, and it cannot reflect the various soil fertility levels of the local farmland. However, it is virtually impossible to arrange fertilizer tests on every farmland. Therefore, soil testing is generally combined with field fertilizer testing. In farmland with the same level of soil fertility, the amount of fertilizer obtained from the fertilizer test results is recommended.
2. The nutrient abundance index method The principle of recommended fertilization in soil testing shows that the level of various nutrients in the soil has a close relationship with the yield of the crops grown on the soil. For soils with high soil nutrient levels, crop yields are also higher, while for soils with low nutrient content, crop yields are low. Therefore, in order to achieve a certain target yield, it is possible to use less fertilization in plots with high soil nutrient content, and more fertilization in plots with low soil fertility levels.
The listed high, high, low, and very low grades are indicators of soil nutrient availability. In order to formulate indicators of soil nutrient abundance, soil fertility determination tests should first be conducted on different soils. The relative crop yield in the whole fertilizer area with nitrogen, phosphorus, and potassium fertilizers, and the lack of nutrients in one of the nitrogen, phosphorus, and potassium fertilizers were used as indicators. The relative output of less than 55% is extremely low, 55% to 75% is low, 75% to 95% is medium, 95% to 100% is high, and more than 100% is extremely high. By grouping the test values ​​of the available soil nutrients at each test point according to the aforementioned indicators of abundance, an abundance index of soil available nutrients (nitrogen, phosphorus, and potassium) can be obtained, and the fertilization can be guided based on this.
3. Proportional method of nitrogen, phosphorus and potassium Through the field experiment, determine the most suitable amount of nitrogen, phosphorus and potassium in a certain crop, and calculate the ratio among the three. In practice, as long as the amount of one of the nutrients is determined. This method of recommended fertilization is simple and easy, and has played a large role in the promotion of formula fertilization technology, such as nitrogen and phosphorus, nitrogen and potassium.
There are still many successful methods in production that need to be communicated, verified, and promoted by everyone.
Determination of Fertilizer Fertilizer by Soil Testing:
In recent years, in the process of carrying out soil testing and formula fertilization, there are mainly three methods for determining the amount of chemical fertilizers. The first method is the target production method. The advantage of this method is that the technical content is high, and the fertilizing amount calculated when the measured value is in the middle range is also relatively realistic, but some parameters are not easily obtained, especially the coefficient of soil nutrient utilization, so the maximum value of the determination, The calculated minimum amount of fertilizer is often not practical. The second is the method of fertility classification. According to the level of soil fertility, the amount of fertilization is determined by combining the optimal amount of fertilizer at different levels of fertility. This method is simple and easy to use. Generally, the level of soil fertility has a certain relationship with soil nutrients, and it also has a certain degree of scientificity. However, because soil nutrients are not taken into account, they are very extensive. The third is the combination method of soil grading and measured values. According to the level of soil fertility, the output will be formulated. According to the soil nutrient content under this level of production, the amount of fertilization at different levels will be divided. This method not only considers the level of production, but also takes into account the status of soil nutrient content, and it is also very easy to operate. However, the use of measured soil values ​​is not sufficiently detailed.
The above method was only based on experience and related theories, and did not undergo a rigorous field trial. Therefore, it is for reference and discussion only.