Dc Motor Fan,Smart Ceiling Fans,Ac Motor Fan Ceiling,Dc And Ac Motor Ceiling Fan Jiangmen MagicPower Electrical Appliances Co.,Ltd. , https://www.magicpowerfan.com
Answer: First, in the production of pollution-free vegetables, fertilization should be based on organic fertilizers, supplemented by other fertilizers, with the principle of multi-component fertilizers and supplemented by single-element fertilizers. The second is to control the application of nitrogen fertilizer as much as possible. Generally, the amount of nitrogen applied per mu does not exceed 30 kg. Third, the fertilizer must be applied in combination with organic fertilizer. The ratio of organic nitrogen to inorganic nitrogen is 2:1. Fourth, the last application of fertilizer should be carried out 15 days before the harvest of the vegetables, so that the inorganic nitrogen absorbed into the body has a conversion time in the body, which can reduce the nitrate content of the vegetables.
Q: What are the factors related to nitrate content in vegetables?
A: The nitrate content in vegetables is closely related to the type of vegetables. The general rule is leafy vegetables> melons> fruits and vegetables, which is determined by the biological characteristics of vegetables. In addition, the nitrate content of vegetables is closely related to the type of fertilizer applied. The order of nitrate content is: fertilizer > manure > high temperature compost > biological fertilizer.
Q: What are the permitted fertilizers in the production of pollution-free vegetables?
A: In the production of pollution-free vegetables, the fertilizers allowed to be used include compost, manure, biogas fertilizer, green manure, crop straw, mud fertilizer, cake fertilizer and other farmyard manure. Farmyard manure should strongly advocate high-temperature composting, because in the process of stacking, the fermentation of the material can make the stack temperature reach 55 °C ~ 70 °C for 10-15 days, which can kill pathogenic microorganisms, insects, eggs and miscellaneous. Grass seeds and so on.
In the production of pollution-free vegetables, the use of compound microbial fertilizers, humic acid fertilizers, etc. is permitted. Biological bacterial fertilizer mainly relies on the slow decomposition of microorganisms to exert its fertilizer effect, which can effectively reduce the content of nitrate in vegetables and improve the quality of vegetables.
In the production of pollution-free vegetables, mineral potassium and potassium sulfate, mineral phosphate fertilizer and potassium sulfate type compound fertilizer, as well as trace element foliar fertilizer mainly composed of various trace elements and beneficial elements are allowed. Bone meal, amino acid residues, agricultural and livestock processing fertilizers, sugar factory waste, etc. are also available.
Expert Tips: â— Flexible fertilization according to the type of vegetables and cultivation conditions. The accumulation of nitrate varies greatly among different types of vegetables. â— In the process of fertilization, the type of vegetables, cultivation season and climatic conditions should be considered, and the amount of chemical fertilizer should be mastered to ensure that the content of nitric acid pots is within the prescribed range of pollution-free vegetables.
How to fertilize pollution-free vegetables
Q: Now that people's lives are getting richer, there is a higher demand for the quality of vegetables that must be eaten daily. What are the fertilization principles for growing pollution-free vegetables?
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】