Compound amino acid fertilizer applications should pay attention to the problem:
1, should be combined with inorganic nitrogen fertilizer
Amino acid is an organic nitrogen source. Current research shows that amino acids can not completely replace inorganic nitrogen fertilizers, and it should have good benefits and effects when combined with inorganic nitrogen fertilizers. On the basis of soil testing, formulating and fertilizing, Tian Yanfei carried out the experiments of reducing rice fertilization and amino acid water-soluble fertilizers. The results showed that the nitrogen-reduced 10% + amino acid water-soluble fertilizer treatment can increase the yield by 6.73%, and increase the cost by 19.77%. Nitrogen treatment 15% + amino acid water-soluble fertilizer treatment yield and income were consistent with the test soil fertilization treatment; NPK, 10% each + amino acid water-soluble fertilizer treatment significantly reduced rice yield and farmers' income. Therefore, based on soil testing and fertilizer application, the reduction of nitrogen fertilizer by 10% or 15%, together with the application of amino acid water-soluble fertilizer, can achieve the purpose of stabilizing or increasing production, and the environmental benefits are considerable.
2, should choose the concentration according to crop type
Each fertilizer has its own applicable crop range and concentration range, which can have adverse effects beyond the scope of the crop. Li Zhiwei studied the effect of monosodium glutamate waste residue fertilizer on rapeseed growth and soil chemical properties using a potted plant test method. Compared with urea with equal amounts of nitrogen, N1 (100 mg N/kg) and N2 (200 mg N/kg) levels of monosodium glutamate MSW were increased by 7.9% and 15.4%, respectively, compared with urea-treated rapeseed biomass; N3 (400 mg N/kg) treatment was applied. The urea treatment died after emergence, and the application of monosodium glutamate waste residue treatment was significantly lower than the non-nitrogen treatment rape biomass. When Zhou Xuelai poured spent liquid as a tomato nutrient solution, he believed that the dilution factor should be determined according to the conductivity requirement of the tomato tolerant nutrient solution. Liu Wei substitutes the nitrate nitrogen in the inorganic nutrient solution in different ratios (28.57% and 57.14%) of amino acid nitrogen under greenhouse cultivation conditions to make a low- and high-concentration amino acid nutrient solution. The low concentration of amino acid nitrogen increased the soluble sugar content of tomato, and the high concentration of amino acid nitrogen reduced the content of tomato Vc. It was concluded that the amino acid can be used as a nitrogen source for tomato, but the proportion in total nitrogen should not exceed 50%. Therefore, in production, appropriate concentrations should be selected according to different crops to facilitate crop growth and quality improvement.
3, the impact of different crop quality is not the same
Regarding amino acid fertilizers affecting crop quality, Chen Guilin replaced 20% nitrate nitrogen with different combinations of glycine, isoleucine and valine, and urea, and studied the nitrate content of non-heading Chinese cabbage and lettuce in hydroponic culture through a hydroponics experiment. And the impact of quality. The results showed that the partial substitution of amino acid for nitrate nitrogen in the nutrient solution not only significantly reduced the nitrate content in the two vegetables, but also improved the quality. The reason is that non-heading Chinese cabbage and lettuce will preferentially absorb glycine, isoleucine, and valine, thus inhibiting the absorption of nitrate nitrogen by plant roots, thereby reducing the nitrate content in two kinds of vegetables. Zhang Zheng also found that using glycine as a nitrogen source does not increase the nitrate content of cucumber plants under sterile culture conditions because glycine is completely absorbed in the molecular state. However, under the conditions of greenhouse substrate cultivation, Liu Wei used amino acids as the nitrogen source to reduce the nitrate content of tomato to a certain extent, but the difference was not significant compared with nitrate nitrogen as the nitrogen source. Field trials by Wu Yanrong et al. found that foliar spraying of amino acids significantly increased nitrate content in non-heading Chinese cabbage. The difference between the above research results is that although some crops can absorb molecular amino acids, under field conditions, due to the presence of soil microorganisms, some amino acids may be absorbed after being decomposed to inorganic nitrogen, so in production, amino acids are used. The use of other organic nitrogen as a nitrogen source also increases the nitrate content of the crop.