Problems and solutions in fertilization of greenhouse vegetables

Greenhouse vegetables are currently the best way to grow, with high economic benefits, and vegetables are not subject to seasonal restrictions. Vegetables can be grown in different seasons. However, greenhouse vegetable cultivation management should pay great attention. Fertilization is very important. Today, Huinong.com Share the problems and solutions in the fertilization of greenhouse vegetables, and grow up!

Greenhouse vegetables are a kind of high-yield and intensive cultivation method, which is a high-input, high-output, high-efficiency industry, so the development speed of each place is very fast. According to a typical survey, the problems in the fertilization of large-scale vegetables are:

(1) Nutrient inputs greatly exceed the needs of vegetables. According to the field survey of 49 large-scale cucumber fertilization in a city of Shandong Province, the average child production of cucumber was 6671. 4 kg / mu, while the amount of fertilizer applied, nitrogen (N) was 131.3 kg / mu, and phosphorus (P205) was 191.7. Kg/mu, potassium (K20) is 70.9 kg/mu. Comparing the nutrient uptake of 7000 kg of greenhouse cucumber per mu, the nitrogen (N) is 19.1 kg/mu, the phosphorus (P205) is 9.1 kg/mu, and the potassium (K20) is 24.3 kg/mu. Obviously, the nutrient input is large. More than the actual needs of vegetables (nitrogen is 5.87 times, phosphorus is 20 times, potassium is 1.9 times). This status of fertilization cannot be considered reasonable.

(2) Nutrient input is extremely uneven. The input of nitrogen in vegetables is generally high, with a minimum of 52.39 kg nitrogen per mu (N); the highest is 134.91 kg nitrogen per mu, with an average of 89 kg nitrogen per mu; phosphorus inputs vary widely. The minimum per mu is only 16.09 kg of phosphorus (P205), and the maximum per mu is as high as 150. 24 kg. Generally between 15.17?61.08 kg potassium (K20) per mu. Obviously, the nutrient input is extremely unbalanced, so there is a certain blindness.

(3) The utilization rate of nitrogen fertilizer is very low. The above-mentioned application of fertilizing children plus organic fertilizer was exchanged for the output of 8664 kg of vegetables. From the actual absorption of nutrients in greenhouse vegetables, the input was more than several times the actual absorption, and the nitrogen utilization rate was significantly reduced. Due to the unreasonable application of chemical fertilizers, it is easy to cause high concentration of salt damage in the plough layer soil, which causes a decline in yield and quality.

Fertilization is a key process for planting all crops. Because the nutrition of plants determines the yield of plants, the problems and solutions in the above-mentioned greenhouse vegetable fertilization are as follows!