Technology of fertilization of pollution-free vegetable

Pollution-free vegetables, is refers to the pesticide residues in vegetables, heavy metal, nitrate and so on all kinds of pollution and harmful substance content, control within the scope of the provisions of the state, the people after eating vegetables is not enough to cause harm to human body health.How can the pollution-free vegetable be fertilized scientifically?The following is the introduction of pollution-free vegetable fertilization technology.

How does pollution-free vegetable apply fertilizer scientifically

1. The principle of pollution-free vegetable fertilization is mainly organic fertilizer, supplemented by other fertilizers;It is mainly composed of multiple compound fertilizers, supplemented by single element fertilizers.Mainly apply basal fertilizer, supplemented by fertilizer.Limit the use of chemical fertilizers as much as possible, and if necessary, apply some of them selectively.

1. In accordance with the national standard "requirements for safe quality and pollution-free vegetables for agricultural products" (gb18406.1-2001) as the principle.Fertilization should not cause environmental pollution and give consideration to high yield and high efficiency.

2. The principle of organic fertilizer and auxiliary fertilizer.We should attach importance to the application of high quality organic fertilizer and apply fertilizer rationally. The ratio of organic nitrogen to inorganic nitrogen should not be less than 1:1.

3. Principle of balanced fertilization.The application amount of fertilizer was determined according to the requirement of balanced fertilization on the basis of soil nutrient determination results and vegetable fertilizer requirement.Although all have corresponding standard set forth, but generally will not exceed the following principles: the highest inorganic nitrogen nutrient application set limit to 225 kg/ha, while applying inorganic phosphate fertilizer, potash fertilizer content depends on the soil fertility status, in order to maintain soil nutrient balance shall prevail.The use of chlorinated fertilizer on vegetables is prohibited;Leaf vegetables and root vegetables shall not be fertilized with nitrogenous fertilizer.

4. Principles of nutritional diagnosis and fertilizer application.According to the vegetative characteristics of vegetable growth and development, the nutrient diagnosis of soil and plant was carried out, and the nutrient requirements of vegetables were met.No nitrogen fertilizer shall be applied to vegetables harvested once, especially leaf vegetables, within 20 days before harvest.For continuous results of vegetables, fertilizer should not be more than 4-5 times.

2. The types and types of fertilizers allowed to be used in the production of pollution-free vegetables include:

1. High quality organic fertilizer.Such as compost, barnyard manure, biogas fertilizer, green manure, crop straw, mud manure, cake fertilizer and so on.It should be fully ripe before application.

2. Biological bacterial fertilizer.Including humic acid fertilizer, rhizobia fertilizer, phosphorus bacteria fertilizer, compound microbial fertilizer.

3. Inorganic fertilizer.For example, ammonium sulfate, urea, calcium superphosphate, potassium sulfate, and other nitrogen and phosphorous fertilizer without chlorine and nitric nitrogen, as well as local production of vegetable special fertilizer.

4. Trace element fertilizer.That is, copper, iron, boron, zinc, manganese, molybdenum and other trace elements and beneficial elements as the main fertilizer.

5. Other fertilizers.Such as bone meal, amino acid residue, livestock processing waste, sugar factory waste.

Technology of fertilization of pollution-free vegetable

Comprehensive implementation of soil testing formula balanced fertilization

Applied to reduce the pollution, give full play to, the soil testing and formula balanced fertilization should be implemented according to the vegetable nutritional physiology characteristic, absorb fat rule, soil for fertilizer and fertilizer effect performance, determine the organic fertilizer, nitrogen, phosphorus, potassium, and the appropriate amount of trace element fertilizer and proportion, as well as the corresponding fertilization techniques, to suit the formula, suit the application.The specific types and amounts of fertilizer should be included;Proportion of basal fertilizer and fertilizer application;Number and period of fertilizer application;And the fertilization method according to the characteristics of fertilizers.Formula fertilization is the basic fertilization technology of pollution-free vegetable production.

Iv. Matters needing attention in the fertilization of pollution-free vegetables

1. Organic fertilizers, such as human manure and manure, should be fully fermented and matured, and be washed with water after fertilizer application.

2. Fertilizer and vegetable special fertilizer should be applied deep and applied early. Deep application can reduce nutrient volatilization, prolong fertilizer supply time and improve fertilizer utilization rate.Early application is beneficial to early growth of plants, long fertilizer effect, reduce nitrate and other toxic accumulation.Generally, ammonium nitrogen is applied to the soil layer below 6cm, urea is applied to the soil layer below 10cm, phosphate and potassium is applied to the soil layer below 15cm, and vegetable special fertilizer is applied to the soil layer below 15cm.

According to the flexible fertilization of vegetable species and cultivation conditions, the accumulation degree of nitrate varies greatly among different types of vegetables. Generally, leaf vegetables are higher than melon vegetables, and melon vegetables are higher than fruit vegetables.In addition, the nitrate content of the same vegetable also varies under different climatic conditions. Generally, under high temperature and strong light, the accumulation of nitrate is low.Conversely, nitrates accumulate in large amounts at low temperature and low light.In the process of fertilization, the types of vegetables, planting seasons and climatic conditions should be taken into account, so as to control the reasonable amount of fertilizer, and ensure the nitrate content within the specified range of pollution-free vegetables.

Above is the introduction of pollution-free vegetable fertilization technology, planting pollution-free vegetable farmers friends, can refer to the above fertilization technology, combined with the actual planting situation, reasonable fertilization.