It needs science to choose foliar fertilizer with good effect.

"in addition to big chemical fertilizer, I buy some foliar fertilizer every year. Especially in the case of low temperature, the use of foliar fertilizer to promote early maturity, the effect is very obvious. " On March 22, Li Xiangchen, a farmer in Xinmintun Village, Bin County, Heilongjiang Province, who was buying spring ploughing fertilizer, told reporters. Foliar fertilizer is the fertilizer applied on the foliar surface of crops during the growth of crops. Generally can be divided into a large number of element foliar fertilizer, trace element foliar fertilizer, humic acid foliar fertilizer and amino acid foliar fertilizer. In recent years, foliar fertilizer is favored by more and more people. Li Xiangchen is a major local grower who has planted more than 150 mu of rice. he also pays special attention to the use of various inputs. He told reporters that he plans to use more foliar fertilizers to replace some large chemical fertilizers this year, because the price of large chemical fertilizers in Heilongjiang has risen by nearly 50%. Compared with foliar fertilizer, foliar fertilizer appears to be more quality and cheap. He calculated an account: a small packet of 15ml foliar fertilizer can be sprayed with water for 2 mu of land, the price is only 1.2 yuan, and 150 mu of land is sprayed for less than 100 yuan, which is much lower than the 180 yuan price of a packet of 50 kilograms of large chemical fertilizer this year. Quick effect is also a major advantage of foliar fertilizer, "especially drought-affected rice, spray foliar fat eyes to look at the wilted leaves will grow up." Li Xiangchen said. According to the test, 1%-2% urea aqueous solution sprayed on the leaves can absorb 1 max 3 after 24 hours; spraying 2% concentration of calcium superphosphate extract can be transferred to all parts of the plant in 5 minutes. This is also particularly useful in the seedling stage, generally underdeveloped root system, weak absorptive capacity, easy to appear seedling yellow, seedling weak phenomenon, the effect of foliar fertilization is more obvious. It is generally believed that greatly improving the utilization rate of fertilizer is the more important significance of foliar fertilizer. At present, the average utilization rate of fertilizer in our country is less than 30%, and a large amount of fertilizer has not been effectively used. moreover, excess fertilizer enters the soil to cause soil consolidation and enter the water body to pollute the environment. On the other hand, foliar fertilizer is sprayed directly on the leaf surface, and the utilization rate is greatly improved. The effect of foliar fertilizer is obvious, why has it not been popularized on a larger scale? Wei Xuetao, owner of the bumper harvest agricultural aid store in Acheng District, Harbin, told reporters: "foliar fertilizer has a quick effect, but it lasts a short time, and it will be sprayed once in about 7 days." It is troublesome to use, but many farmers are unwilling to buy it. " However, experts from the Plant Protection Station of the Heilongjiang Provincial Committee of Agriculture explained that foliar fertilizer can be sprayed with pesticides, which greatly reduces the labor intensity of using foliar fertilizer. At present, the chaos of foliar fertilizer market is also the biggest bottleneck restricting its development. Liu Dongsheng, the person in charge of Guangxi Beihai Spencer Company, the earliest enterprise in China to make foliar fertilizer, told the reporter that because the production of foliar fertilizer is relatively simple and the state does not have strict standards for foliar fertilizer, as a result, many manufacturers appear on the market every year, holding temporary registration certificates or failing to pass national examination and approval at all, making a profit for two or three years and leaving, greatly disturbing the market order. In Wei Xuetao's agricultural aid shop, there are dozens of signs of foliar fertilizer. Li Hongwu, manager of Spencer Heilongjiang Province, pointed to these products and said: "Farmers can't distinguish these brands. They try to buy them back. If they don't work, they will think that products like foliar fertilizer don't work. This is extremely disadvantageous to the development of foliar fertilizer industry." The low cost and high efficiency of foliar fertilizer has become the consensus of more and more people, but at the same time, relevant people of the Ministry of Agriculture also pointed out that because foliar fertilizer is sprayed on the leaf surface during crop growth, it can only play a temporary role in replenishing nutrients. For nitrogen, phosphorus, potassium and other element fertilizers, crop demand is large, simple foliar fertilizer is not enough, but also need to be fertilized in soil.