Crops can not grow without nitrogen, phosphorus, potassium fertilizer, because of the need for large, it is called a large number of elements. In addition to nitrogen, phosphorus, and potassium, actual crop growth requires sulfur, calcium, magnesium, silicon, and other intermediate elements. Iron, manganese, boron, copper, zinc, molybdenum, chlorine, and other trace elements are also essential. Rare earth elements. What is more important is that in most cases, microelements directly determine the yield of crops. This is the minimum decision law for fertilizers that is confirmed by experts both at home and abroad. Due to cultural literacy and other reasons, it has been decided that some peasants only pay attention to the three elements of nitrogen, phosphorus, and potassium while ignoring the problems of the middle and trace elements. Practice has led us to realize that comprehensive use of multiple element fertilizers is the future of agricultural production. The inevitable trend of development.
Domestic and foreign data tell us that in the land under moderate fertility in our province, 667 tons of corn needed to produce 523 kg of N+P+K=9%+4.5%+2.25%=15.75%. 667? The production of 800kg of rice requires N+P+K=16%+6%+5%=27%. Then why is the amount of application increased in production practice? The main reason is to consider the factors such as fertilizer leaching in the soil, air volatilization, soil fixation and other factors, coupled with the effect of different soil conditions on the effect of fertilizer, so increase the amount of use. In particular, sandy land, yellow land, hillocks, depressions, dams, and white clay soils affect the exertion of fertilizer efficiency. Therefore, it is necessary to appropriately increase the amount of use. 35% of the mixed fertilizer (with organic matter, trace fertilizer and fungus fertilizer) basically ensured the demand of the crop. With the increase of the yield index and the increase of the density, the fertilization amount and frequency of topdressing should be appropriately increased.
About the phenomenon of deferment of crops, it is generally first performed on the leaves. Especially in the middle and later stages of crop growth, when the amount of fertilizer needed is increased, the performance is obvious. In the early period, due to the small size of seedlings, the low temperature, the small amount of fertilizer needed, and the slow growth of the crops, the lack of fertilizers was not obvious. Take corn as an example: especially in the absence of nitrogen fertilizer, the corn's bottom leaf starts from the tip of the leaf and turns yellow evenly to the petiole; in the absence of phosphate fertilizer, the lower leaf turns yellow from the tip of the leaf and does not regularly appear lavender on the side of the leaf. phenomenon. In the absence of potash fertilizer, the front part of the leaves yellowed and became dry and the middle part of the veins appeared green. The total number of plants that lack nutrients is short, thin, susceptible, and lodging.
In the middle and late stages of corn growth, the absence of molybdenum, manganese, copper and zinc fertilizers is mainly caused by changes in the middle leaves. Deficiency of boron, calcium, sulfur, and iron are mainly manifested in the upper part of some leaves. At the same time, it showed baldness, bending, and small sticks on the head.
After understanding the characteristics of crop shortages, it is possible to take remedial measures in accordance with crop growth status. From the perspective of corn growth and land cultivation in our province, the shortage of plots must be picked up from the spring. In particular, when the maize is planted, it is necessary to apply good agricultural fertilizers and mixed manure, and it is necessary to replenish the micronutrients before sealing. , Fertilizer, foliar fertilizer, do not wait until mid-to late to make up for fat, so as to affect production, so as to lay the foundation for the harvest of agricultural harvest throughout the year.
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