In the case of fertilizer application limit, how to maintain the continuous growth of food production? The key is to increase the utilization rate of chemical fertilizers or increase the input of other fertilizers. It must not blindly limit and grow blindly, and technical measures must keep pace. Only in this way can we achieve the goal of zero growth of chemical fertilizers and continuous production growth.
Adding organic fertilizer
For the organic fertilizer contains a variety of nutrients, in addition to containing a large number of elements such as nitrogen, phosphorus, potassium, but also contains many of the crop needs of the middle-level elements and trace elements, can provide the crop with all the necessary nutrients, especially to provide trace Nutrients can reduce or replace part of the fertilizer. Organic fertilizer also contains organic matter and humus, which can improve the soil structure, coordinate the relationship between soil and water, gas and heat, enhance the permeability of the soil and the ability to retain water and fertilizer, and promote crop growth.
The method of stacking organic fertilizers can be used for stacking. Usually, wastes such as human and animal wastes and crop straws are used as raw materials, and commodity organic fertilizers can also be used.
Formulated fertilization
Based on soil testing and fertilizer field tests, based on the laws of fertilizer requirements of the crops, fertilizer performance of the soil, and fertilizer effects, based on the rational application of organic fertilizers, fertilizers such as nitrogen, phosphorus, potassium, and trace elements are provided. The number and method of application.
å’‹ Do the nutrients needed for targeted crop replenishment, what elements the crop lacks, what supplements it needs, how much supplements it needs, how to balance supply of nutrients, meet the needs of crops, increase fertilizer use efficiency, and reduce fertilizer use, Improve crop yields, improve the quality of agricultural products, and increase savings.
Improve fertilization
For different soil textures, the method of fertilization used is different. In general, viscous, loamy soil, should be based on basal fertilizer, basal dressing combined with fertilizer methods. Sandy soils should use a small number of fertilization methods. Regardless of the nature of the soil, it is forbidden to spread the fertilizing material on the surface and change the chemical fertilizer to be applied and applied as a mechanical deep application. The application depth of nitrogen fertilizer is preferably 8 to 10 cm. Phosphorus, potash, and trace fertilizers are to be applied in full-layer fertilization, that is, the fertilizer is used in areas where crop roots can reach to facilitate crop absorption and utilization.
In order to implement water and fertilizer integration, water is used to regulate fertilizers. The supply of water is closely related to the absorption of crop nutrients. Improper use of water not only results in the loss of nutrients, but also affects the growth of crops. Appropriate amount of timely irrigation can promote the absorption of fertilizer and increase the utilization of fertilizer.
Grasp the best fertilization time
The nutritional critical period and the maximum efficiency period for the crop are the two critical periods for crops to absorb nutrients, and these two periods should be grasped to ensure the maximum efficiency of the fertilizer and the crop's demand for nutrients. In general, the critical period of nutrients for phosphorus is in the early period of fertility, and nitrogen is transformed from vegetative growth to reproductive growth.
According to the growth period of crops and the law of fertilizer requirements, the crops should be used in the most sensitive periods of the crop's fertilizer requirements. According to the reproductive characteristics of the crops, the principles of light, medium, and heavy crops should be mastered.
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