Plant growth nutrients must be comprehensive. There are 17 kinds of essential nutrients for plant growth, which can be divided into large, medium and micronutrients. A large number of elements include carbon, hydrogen, oxygen, nitrogen, phosphorus and potassium. Medium elements include calcium, magnesium and sulfur. Trace elements include iron, copper, zinc, manganese, molybdenum, boron, nickel and chlorine. The growth and development of crops need to absorb all kinds of nutrients. A large number of elements, nitrogen, phosphorus and potassium, have been well known as the three elements of fertilizer. Relevant nitrogen, phosphorus and potassium fertilizers have also become the pillar industry of the world fertilizer industry. With the improvement of modern agricultural production and the extensive use of nitrogen, phosphorus and potassium fertilizers, the shortage of trace elements in soil is becoming more and more serious.
The medium and trace elements are "small" and "big"
Most of the trace elements are the components of enzymes or coenzymes that promote photosynthesis, respiration and substance transformation in plants, and they are very active in plants. When a certain trace element in the soil which provides plant nutrients is insufficient, the plant will appear "nutrient deficiency symptoms". For example, cotton "bud but not flower", rape "flower but not solid", citrus "stone fruit" and "small hard fruit" are all caused by the lack of trace element boron. In addition, zinc deficiency in maize is prone to leaf albinism, zinc deficiency in rice affects tillering, and zinc deficiency in citrus and apple trees results in "leaf clustering, leaf blight, yellow leaf blight" and so on. Molybdenum deficiency in plant leaves is prone to flagellate and macular diseases, and iron deficiency can cause chlorosis and yellowing of leaves. The lack of trace elements often leads to the decrease of crop yield and quality, and even no grain harvest in severe cases.
In summary, the application of micronutrients in crops has the following main functions. In order to increase crop yields, some farmlands have been using excessive nitrogen, phosphorus and potassium fertilizers for a long time, resulting in deterioration of soil quality and limited increase in crop yields. Targeted application of micronutrient fertilizer is an effective technical measure to improve the yield of Low-yield and high-yield fields, and also an important means to maintain continuous yield increase of high-yield fields. By increasing the application of medium and micro-fertilizers, the requirement of various nutrient elements of crops is met, and the crops can grow normally, so as to obtain ideal yield and benefit.
Improving the application of trace element fertilizers in crop quality has greatly improved the inorganic nutrition balance of crops, not only greatly increased crop yield, but also greatly improved the quality of agricultural products, effectively reduced the nitrite content in agricultural products, and some diseases caused by local deficiency of nutrients can also be effectively prevented and cured. Cure. The scientific application of micronutrient fertilizer not only meets the needs of crops for nutrient elements, makes them develop normally and mature completely, improves the quality of agricultural products, but also reduces the surplus of a large number of elements nitrogen, phosphorus and potassium, avoids the waste of fertilizer and reduces soil pollution.
According to the law of minimum nutrient, increasing the utilization rate of chemical fertilizer is beneficial to balance the proportion of large, medium and micro nutrient elements, and has a good promoting effect on nutrient absorption of crops, instead of applying one element fertilizer unilaterally, which results in waste.
Reducing crop diseases and pests due to the application of trace element fertilizers, so that all kinds of elements needed by crops can be balanced and reasonable supply, which greatly enhanced the ability of crops to resist disease, cold, high temperature and drought. Diseases caused by lack of nutrients no longer exist in crops, so that crops can grow healthily. For example, the application of boron in crops can promote the normal operation of sugar in vivo and enhance the resistance. Borose complex is a strong acidic complex, which makes the cell fluid reaction acidic and not conducive to the growth of pathogens.
Reducing environmental pollution and increasing the application of trace element fertilizers can make crops absorb all kinds of nutrients in proportion, effectively improve the utilization rate of fertilizers, reduce the environmental pollution caused by fertilizer loss, and play a positive role in environmental protection.
Because the amount of trace elements is very small, it can be exchanged for a larger economic benefit at a smaller cost. The input-output ratio is as high as 1:50-1:100, or even higher, while the input-output ratio of large chemical fertilizer is generally 1:5-1:10, or even lower.