1. Fertilization problems and fertilization principles
Northern China and other northern regions are mostly solar greenhouses. Central and southwestern regions are mostly small and medium arch sheds. There are excessive fertilizations in production. Nitrogen, phosphorus, and potassium fertilizers are used at high rates, nutrient input ratios are unreasonable, and nutrient accumulation of soil nitrogen, phosphorus, and potassium is significantly increased. Excessive irrigation resulted in serious loss of nutrients, widespread acidification of soil, impeded supply of elements such as calcium, magnesium, and boron, continuous cropping obstacles, etc., leading to serious degradation of soil quality, decreased nutrient absorption efficiency, and decreased quality of vegetables. The following fertilization principles were proposed:
(1) Reasonably apply organic manure, adjust the amount of nitrogen, phosphorus, and potassium fertilizers; non-calcareous soils and acidic soils need to be supplemented with trace elements such as calcium, magnesium, and boron;
(2) Reasonably distribute chemical fertilizers based on crop yields, cornices and soil fertility conditions. The majority of phosphorus fertilizers are based on nitrogen and potassium fertilization. Early spring growth should not be top-dressed frequently. Attention should be paid to post-harvest and mid-late fertilization;
(3) Combine with high-yielding cultivation techniques, promote root filling at seedling stage, adopt the principle of “few times†and rationally apply irrigation;
(4) The old shed where the soil is degraded needs to be returned to straw or organic fertilizer with high C/N ratio, less poultry manure, increase the number of rotations, and achieve the purpose of removing salt and reducing continuous cropping obstacles;
(5) When the acidity of vegetable fields is severe, lime soil and other acidic soil conditioners should be applied.
2. Fertilizer amount and method
(1) Increase the maturity of organic fertilization with fertilizer and supplement phosphate fertilizer. Each 10 square meters of seedbeds is subjected to decomposed poultry manure 60-100 kg, calcium, magnesium, phosphate 0.5-1 kg, potassium sulfate 0.5 kg, according to the seedlings sprayed 0.05%-0.1% urea solution 1 or 2 times.
(2) Basal fertilizer application of high quality organic fertilizer 2 ~ 3 square / acre.
(3) Output level 8000~10000 kg/mu: Nitrogen fertilizer (N) 30~40 kg/mu, Phosphorus fertilizer (P2O5) 15~20 kg/mu, Potash fertilizer (K2O) 40~50 kg/mu.
(4) The output level is 6000~8000kg/mu: nitrogen fertilizer (N) 20~30kg/mu, phosphate fertilizer (P2O5) 10~15kg/mu, potassium fertilizer (K2O) 30~35kg/mu.
(5) Production level 4000-6000 kg/mu: nitrogen fertilizer (N) 15-20 kg/mu, phosphate fertilizer (P2O5) 8-10 kg/mu, potassium fertilizer (K2O) 20-25 kg/mu.
Vegetable soil pH
More than 70% of phosphorus fertilizer is used as base fertilizer (hole) application, and the rest is followed with compound fertilizer, 20% to 30% of nitrogen and potassium fertilizer is applied, and 70% to 80% are followed by water 3 to 10 times during the period from flowering to head swelling. Each application of nitrogenous fertilizer (N) does not exceed 5 kg/mu.
Veterinary Raw,Amprolium And Decoquinate,Abamectin Active Ingredient,Bifenthrin Active Ingredient
Xi'an Henrikang Biotech Co.,Ltd , https://www.henrikangbio.com