Guidance on Scientific fertilization of Cucumber in protected facilities

? 1. Principles of fertilization

The planting season of protected cucumber is divided into autumn and winter stubble, overwintering stubble and winter and spring stubble. in view of the excessive fertilization, unreasonable fertilization proportion and serious nutrient loss caused by excessive irrigation, the application of organic fertilizer mainly caused by livestock and poultry manure led to the imbalance of nutrients and the decrease of soil biological activity, continuous cropping obstacles and other problems led to serious degradation of soil quality, decline of nutrient absorption efficiency, decline of vegetable quality and so on. The following fertilization principles are put forward:

(1) rational application of organic fertilizer, advocate the application of high-quality organic compost, old vegetable shed should pay attention to more high carbon and nitrogen than exogenous straw or organic fertilizer, and less poultry manure.

(2) according to the conditions of soil fertility and the application rate of organic fertilizer, and comprehensively considering the supply of soil nutrients, the amount of nitrogen, phosphorus and potassium fertilizer should be adjusted appropriately.

(3) adopt reasonable irrigation and fertilization techniques and follow the principle of irrigation and fertilization for a small number of times.

(4) Nitrogenous fertilizer and potash fertilizer are mainly used as topdressing, a small amount of fertilizer is applied many times to avoid topdressing compound fertilizer with high phosphorus content, it is not suitable to topdressing frequently at seedling stage, and attention should be paid to topdressing in the middle and later stage.

(5) when the vegetable land is acidified seriously, acid soil conditioners such as lime should be applied appropriately.

? 2. Fertilization suggestion

(1) increase the application of rotten organic fertilizer and phosphate fertilizer, apply mature organic fertilizer 60kg / 100kg, calcium magnesium phosphate fertilizer 0.5kg / kg, potassium sulfate 0.5kg / 10 square meters, and spray 0.05%-0.1% urea solution twice according to seedling condition.

(2) applying 4 square meters of high quality organic fertilizer to base fertilizer.

(3) yield level 14000kg / mu, nitrogen fertilizer (N) 40kg / mu, phosphate fertilizer (P2O5) 13kg / mu, potash fertilizer (K2O) 50kg / mu.

(4) yield level 11000kg / mu, nitrogen fertilizer (N) 35kg / mu, phosphate fertilizer (P2O5) 11kg / mu, potash fertilizer (K2O) 40kg / mu

(5) yield level 7000kg / mu, nitrogen fertilizer (N) 28kg / mu, phosphate fertilizer (P2O5) 8kg / mu, potash fertilizer (K2O) 30kg / mu.

(6) the yield level is 40007000kg / mu, nitrogen fertilizer (N) 20kg / mu, phosphate fertilizer (P2O5) 5kg / mu, potash fertilizer (K2O) 25kg / mu.

If drip irrigation is used, the amount of chemical fertilizer can be reduced by 20%, and if flooded, the amount of fertilizer will need to be increased by 20% each time.

All organic fertilizer and phosphorus fertilizer were applied as base fertilizer for cucumber in greenhouse, and all nitrogen and potassium fertilizers were regularly topdressing 6-8 times according to the nutrient requirements of growth period, and the amount of nitrogen fertilizer was not more than 5 kg / mu each time. Nitrogen and potassium fertilizer in autumn and winter and winter and spring were topdressing for 6 and 7 times, and nitrogen and potassium fertilizer for long winter stubble were topdressing for 8 and 11 times. If the drip irrigation fertilization technology is adopted, the principle of a small number of times can be adopted, and the number of irrigation and fertilization is about 15 times. Science and education subject