1. Cucumber fertilization problems and fertilization principles

In view of the blind and excessive fertilization in cucumber production, the proportion of fertilization is unreasonable, and excessive irrigation leads to serious nutrient loss. The organic fertilizers applied to cucumber planting soil are mostly livestock and poultry manure, which reduces soil biological activity, and continuous cropping obstacles lead to serious soil quality degradation. Nutrient absorption efficiency declines, cucumber quality declines and other issues, the following fertilization principles are proposed:

(1) Increase the application of organic fertilizers, advocate the application of high-quality organic compost, and pay attention to applying more compost containing more straw and less poultry manure in old vegetable sheds, and implementing the combination of organic and inorganic fertilizers and returning straw to the field.

(2) According to soil fertility conditions and the application amount of organic fertilizers, taking into account the supply of environmental nutrients, appropriately adjust the amount of nitrogen, phosphorus and potassium fertilizers.

(3) Adopt reasonable irrigation technology and follow the principle of small and multiple irrigation and fertilization.

(4) It is not advisable to apply frequent top-dressing in the seedling stage after the cucumber is planted. Nitrogen and potassium fertilizers are applied in stages, in small amounts and multiple times. Avoid top-dressing of compound fertilizers with high phosphorus content, and pay attention to top-dressing in the middle and late stages.
(5) When the soil acidification of cucumber planting is serious, an appropriate amount of acid soil conditioner such as lime should be applied.

2. Cucumber fertilization amount and method

(1) Increase the application of decomposed organic fertilizer and supplementary phosphate fertilizer in the seedling raising fertilizer. For every 10 square meters of seedbed, apply 60~100 kg of decomposed organic fertilizer, 0.5~1 kg of calcium magnesium phosphate fertilizer, 0.5 kg of potassium sulfate, and spray 0.05%~ 0.1% urea solution 1~2 times.

(2) Apply high-quality organic fertilizer 45~60 cubic meters per hectare as base fertilizer.

(3) The cucumber yield level is 210,000~240,000 kg/ha: nitrogen fertilizer (N) 675~750 kg/ha, phosphate fertilizer (P2O5) 300~375 kg/ha, potash fertilizer (K2O) 600~675 kg/ha.

(4) The yield level of cucumber is 165000~210000 kg/ha: nitrogen fertilizer (N) 555~675 kg/ha, phosphate fertilizer (P2O5) 255~300 kg/ha, potash fertilizer (K2O) 525~600 kg/ha.

(5) The cucumber yield level is 105000~165000 kg/ha: nitrogen fertilizer (N) 450~555 kg/ha, phosphate fertilizer (P2O5) 255~240 kg/ha, potash fertilizer (K2O) 450~525 kg/ha.
(6) The yield level of cucumber is 60000~105000 kg/ha: nitrogen fertilizer (N) 300~420 kg/ha, phosphate fertilizer (P2O5) 120~165 kg/ha, potash fertilizer (K2O) 375~450 kg/ha.

If drip irrigation is used, the chemical fertilizer can be reduced by 20%; if flood irrigation is used, the amount of fertilizer needs to be increased by 10% to 20% for each fertilization.
All organic fertilizers and phosphate fertilizers were used as base fertilizers for cucumbers, and the control was mainly used in the early flowering period. All nitrogen and potassium fertilizers are regularly topdressed 6 to 11 times according to the nutrient requirements of the growth period, and the amount of nitrogen fertilizer applied each time does not exceed 75 kg/ha. The nitrogen and potassium fertilizers for autumn-winter stubble and winter-spring stubble are top-dressed 6 to 7 times, and the nitrogen and potassium fertilizers for overwintering long stubble are top-dressed 10 to 11 times.

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