With the improvement of people's living standards, people's health awareness and environmental awareness have been further enhanced, and pollution-free vegetables have become an urgent need of people. Non-polluted vegetables refer to vegetables whose residues of various harmful substances in vegetable products meet the national health and safety standards. First, pesticide residues do not exceed the standards. Non-polluted vegetables do not contain prohibited high-toxic and high-residue pesticides. Other pesticide residues do not exceed the highest in the country. The limit is allowed; the second is that the nitrate and nitrite content does not exceed the standard; the third is that the pollution of “three wastesâ€, heavy metals and pathogenic microorganisms does not exceed the standard. Among them, the problems of heavy metal, nitrate and nitrite content are closely related to the rational application of fertilizer. There are many factors restricting the production of pollution-free vegetables, and how to properly select and apply fertilizer is one of the key measures to produce pollution-free vegetables.
The choice of fertilizer should be based on the type and type of fertilizer that does not adversely affect the nutrition and quality of the environment and vegetables. The types and types of fertilizers that can be applied in the production of pollution-free vegetables can include the following:
(1) Organic fertilizers include farmyard manure and commercial organic fertilizers, and farmyard manures include compost, mud, cake fertilizer, manure, biogas fertilizer, green manure, and crop straw. The compost should meet the NY/T394-2000 "Hygiene Standard for High Temperature Composting". Commercial organic fertilizers shall comply with the “Permissible Contents of Contaminants in Organic Fertilizers†in NY/T5018.
(2) Microbial fertilizers include humic acid fertilizers, rhizobial fertilizers, potassium bacterial fertilizers, phosphorus bacterial fertilizers, and compound microbial fertilizers. The effective viable count of microbial fertilizers must meet the requirements of 4.1 of Microbial Fertilizer NY227, and the health indicators must meet the requirements of 4.2 “Defective Harmlessness Index†in NY227.
(3) Inorganic mineral fertilizers include inorganic nitrogen fertilizer, mineral potassium fertilizer and mineral phosphate fertilizer. Inorganic nitrogen fertilizer should be selected to apply iron nitrogen fertilizer or urea; phosphorus and potassium fertilizer should meet the requirements of NY/T394-2000 sanitary standard, and phosphate fertilizer advocates application of calcined phosphate. The impurity control index is: 1% phosphorus pentoxide per content, As ≤ 0.004%, Cd≤0.01%, Pb≤0.002%; Potassium fertilizer advocates the application of potassium sulfate, the impurity control index is: every 1% nitrous oxide, As ≤ 0.004%, Cl ≤ 3%, sulfuric acid ≤ 0.5%.
(4) Medium and trace element fertilizers The trace elements in calcium, magnesium, copper, iron, boron, zinc, molybdenum and manganese are mainly composed of single elements or several kinds of fertilizers.
The choice of fertilizer should be based on the type and type of fertilizer that does not adversely affect the nutrition and quality of the environment and vegetables. The types and types of fertilizers that can be applied in the production of pollution-free vegetables can include the following:
(1) Organic fertilizers include farmyard manure and commercial organic fertilizers, and farmyard manures include compost, mud, cake fertilizer, manure, biogas fertilizer, green manure, and crop straw. The compost should meet the NY/T394-2000 "Hygiene Standard for High Temperature Composting". Commercial organic fertilizers shall comply with the “Permissible Contents of Contaminants in Organic Fertilizers†in NY/T5018.
(2) Microbial fertilizers include humic acid fertilizers, rhizobial fertilizers, potassium bacterial fertilizers, phosphorus bacterial fertilizers, and compound microbial fertilizers. The effective viable count of microbial fertilizers must meet the requirements of 4.1 of Microbial Fertilizer NY227, and the health indicators must meet the requirements of 4.2 “Defective Harmlessness Index†in NY227.
(3) Inorganic mineral fertilizers include inorganic nitrogen fertilizer, mineral potassium fertilizer and mineral phosphate fertilizer. Inorganic nitrogen fertilizer should be selected to apply iron nitrogen fertilizer or urea; phosphorus and potassium fertilizer should meet the requirements of NY/T394-2000 sanitary standard, and phosphate fertilizer advocates application of calcined phosphate. The impurity control index is: 1% phosphorus pentoxide per content, As ≤ 0.004%, Cd≤0.01%, Pb≤0.002%; Potassium fertilizer advocates the application of potassium sulfate, the impurity control index is: every 1% nitrous oxide, As ≤ 0.004%, Cl ≤ 3%, sulfuric acid ≤ 0.5%.
(4) Medium and trace element fertilizers The trace elements in calcium, magnesium, copper, iron, boron, zinc, molybdenum and manganese are mainly composed of single elements or several kinds of fertilizers.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
led grow light,grow strip light,grow lighting
Shenzhen You&My Electronic Technology Co., Ltd , https://www1.nbyoumysolarlight.com