16 Slice CT,Veterinary Radiology,Micro Computed Tomography,Diagnostic Imaging In The Veterinary MinFound Medical Systems Co., Ltd , https://www.minfoundmed.com
1. Organic manure Dried manure and chicken manure are the main basal fertilizers for the production of vegetables in greenhouses. However, for the convenience of application, vegetable farmers frequently dry human feces and chicken manure in the fields and dry them up. This practice will cause fly maggots to reproduce, nitrogen will volatilize, and fertilizer will lose nitrogen nutrients.
2. Calcium, Magnesium and Phosphorus as Basic Fertilizers on Alkaline Soil Calcium, magnesium, and phosphorus are weakly acidic fertilizers. They are insoluble in water and can only be converted into water-soluble phosphates by the roots of crops under weak acid conditions. However, they can be applied on alkaline soils. The urgent need for phosphorus in crop seedlings causes physiological phosphorus deficiency.
3, superphosphate surface application as topdressing phosphorus mobility in the soil is small, generally 0.5 centimeters at the site, the range of 1 to 3 cm. Therefore, it is difficult to reach the rhizosphere of crops and therefore does not provide the effect of phosphorus in supplementary crops.
4. Immediately after urea application, watered urea is an amido ammonia nitrogen fertilizer, which is easily dissolved in water and applied to the soil. After it is decomposed, it can be converted into ammonium bicarbonate. It is absorbed and used by crops and watered immediately after being applied, making it easy to make urea with water. Loss, reduce fertilizer efficiency.
5, ammonium bicarbonate with water This method often results in more water in the inlet, the crop growth is difficult, difficult to manage, and the afternoon greenhouse temperature, ammonia gas escaped from the soil, smoked the lower crop leaves, causing fertilizer harm.
The main method to improve fertilizer efficiency:
1. Organic manure piled up as base fertilizer In late July, 4000 kilograms of human feces were added in the sunny area, 100 kilograms of calcium magnesium phosphate were added, and 400 kilograms of crushed wheat oranges were added. Cover or use straw to cover the soil for 30 days. Serve high-quality organic fertilizer as a base fertilizer for greenhouses.
2, superphosphate concentrated as a base fertilizer in the transplanting line open 8 cm deep trenches, after throwing phosphorus fertilizer cover soil 4 to 5 cm, and then transplanted crops in shallow trenches, shorten the phosphorus fertilizer and crop root distance to make up for phosphorus movement Sexual weaknesses.
3, early application of urea deep application and root application according to the crop development stage of fertilizer and water demand, in advance chase, deep application, than the shallow application of increased utilization rate of 28%. Shed temperature is 7 days in advance at 15~20°C, shelf temperature is 5 days in advance at 20~25°C, 8~10 cm ditch is opened in top dressing, and soil is covered tightly after spreading. Deep application may be applied to crops with large row spacing. . According to greenhouse temperature watering 5 to 7 days, so that there is enough time in the soil to fully ammoniation, in order to facilitate the absorption and utilization of crops, in the crop growth period, can be sprayed with 0.3% urea foliar, once every 7 days, 100 kg of solution per acre, continuous 2 or 3 times.
4. Ammonium bicarbonate with deep application of ammonium bicarbonate is an ideal quick-acting fertilizer for winter greenhouse vegetable production. Because it is rarely volatilized at a ground temperature of 20°C, it can dissociate into ammonium ions and be absorbed by the soil after it is applied to soil, and then slowly release it for supply. Root absorption of crops, even at soil temperatures of 5°C, can also be converted and absorbed by crops. When composting, it is 10 to 10 cm deep from the roots of the crop, and the soil is covered tightly after spreading. It can increase the utilization rate by 10~30%, and increase production by 10% over shallow application, and increase production by 7.8% over water application.
Greenhouse vegetable production is a high-input and high-output production method in a specific environment. Different fertilization methods not only affect the utilization of fertilizer, but also affect the economic benefits of production. Current misunderstandings in fertilizer application: