Organic fertilizer drying facilities
Human feces and chicken manure are the main base fertilizers for vegetable production in greenhouses. It is often wrong for vegetable farmers to dry human waste and chicken manure in the fields and dry them up to dry for fertilization. This can cause fly larva breeding, nitrogen volatilization, and loss of fertilizer. Nitrogen nutrients.
The correct approach is to compost the organic fertilizer into base fertilizer, such as 4000 kg of human feces or chicken manure in the sunny place in late July, 100 kg of calcium magnesium phosphate fertilizer, 400 kg of crushed or broken wheat straw, and mix Taro-shaped, covered with plastic film or plastered with straw for 30 days. Can be used as a basal fertilizer greenhouse.
Calcium, Magnesium Phosphate Fertilizer as Base Fertilizer in Alkaline Soil
Calcium, magnesium and phosphate fertilizers are weakly acidic fertilizers that are insoluble in water and can be gradually converted to water-soluble phosphates in the roots of crops under weak acid conditions. However, application to alkaline soils can not meet the needs of crop seedlings for phosphorus and can easily cause physiological deficiencies. phosphorus.
The correct method is best to use in acidic soils, and when used as a seed fertilizer or root, the amount should not be too large, and pay attention not to direct contact with the seeds, so as not to cause burning seedlings.
Superphosphate surface application as top dressing
Phosphorus is less mobile in the soil, moving in the range of 1 to 3 centimeters, and surface spread is difficult to transmit to the crop rhizosphere, and thus does not provide the effect of phosphorus in the supplementary crop.
The correct approach is to concentrate calcium superphosphate on the dense layer of roots as a basal fertilizer to reduce the contact with the soil and reduce the fixation of phosphorus in the soil. In the transplanting line open 8 cm deep ditch, thrown into the phosphate fertilizer 4 to 5 cm after the cover, and then in the shallow trench sowing or transplanting crops, shorten the distance between the phosphorus fertilizer and crop roots to make up for the weakness of phosphorus mobility. It can also be mixed with organic fertilizers.
Watering immediately after urea application
Urea soil table immediately after the application of water, easy to make urea with water loss, reduce fertilizer efficiency.
The correct approach is to apply urea early, deep, and external application. Since urea is converted into ammonium nitrogen absorbed by crops in the soil, it takes a certain amount of time. When applied, it is earlier than other ammonium nitrogen fertilizers. When the greenhouse temperature is 15 to 20°C, it is advanced 7 days, and the greenhouse temperature is 20 to 25°C. 5 days. When applying topdressing, open 8 to 10 cm deep ditch. Apply urea to the soil and mix thoroughly to prevent burning of roots. Cover the soil tightly after spreading. For a large row of crops can be used to open a deep hole. Water 5 to 7 days after fertilization to facilitate crop absorption. In addition, 0.3% urea solution can also be used for foliar spray, once every 7 days, 100 kg per mu solution, continuous 2 or 3 times.
Ammonium carbonate with water application
Ammonium bicarbonate is applied with water, which tends to cause crops to grow differently and difficult to manage. If the temperature of the greenhouse rises, ammonia gas escapes from the soil and smoulders damage the lower leaves of the crop, causing damage.
The correct approach is to deepen the ammonium bicarbonate to minimize the exposure time in the air, regardless of the base and topdressing should pay attention to deep, generally 10 to 15 cm is appropriate. When the fertilizer is applied, a groove of 8 cm to 10 cm from the crop neck is opened to a depth of 10 cm. In addition, ammonium bicarbonate should not be used as a fertilizer and foliar spray.
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