Detailed Explanation of Cucumber Nutrient Requirements and Scientific Fertilization Techniques
Nutrient Requirements Cucumbers are best grown in loose, fertile soil with good aeration. Heavy clay soil is not conducive to cucumber root development. Soil with high organic matter content can balance the contradiction of cucumber roots being moisture-loving but not waterlogging-tolerant, and fertilizer-loving but not fertilizer-tolerant. The growth cycle of cucumbers is roughly divided into the germination stage, seedling stage, vine elongation stage, and...
Nutrient Requirements
Cucumbers are best grown in loose, fertile soil with good aeration. Heavy clay soil is not conducive to cucumber root development. Soil with high organic matter content can balance the contradiction of cucumber roots being moisture-loving but not waterlogging-tolerant, and fertilizer-loving but not fertilizer-tolerant. The growth cycle of cucumbers is roughly divided into the germination stage, seedling stage, vine elongation stage, and flowering and fruiting stage.
In the early growth stage, cucumbers have a relatively small nutrient demand. As growth progresses, nutrient uptake increases significantly, reaching a peak during the fruiting stage. Throughout the entire growth period, nitrogen uptake continues to increase and rises sharply once the fruit harvest period begins. Cucumbers are nitrate-nitrogen-loving crops. When only ammonium nitrogen is supplied, the leaves become smaller, growth slows, calcium and magnesium uptake decreases, and calcium deficiency physiological disorders often occur, reducing yield. Cucumber phosphorus uptake is relatively low in the early stage and increases during the fruit enlargement and harvest periods. Cucumber potassium uptake is the highest, followed by nitrogen.
Fertilization Techniques
For cucumbers throughout the entire growth period, the fertilizer application rate per mu is 400-450 kg of commercial organic fertilizer, 14-18 kg of nitrogen fertilizer (N), 6-8 kg of phosphorus fertilizer (P2O5), and 9-11 kg of potassium fertilizer (K2O). Organic fertilizer is applied as base fertilizer. Nitrogen and potassium fertilizers are split between base fertilizer and topdressing, with each topdressing amount divided equally. Phosphorus fertilizer is entirely applied as base fertilizer. Chemical fertilizers and organic fertilizers are applied together.
Base Fertilizer: For base fertilizer application, apply 400-450 kg of commercial organic fertilizer, 4-5 kg of urea, 13-17 kg of diammonium phosphate, and 3-4 kg of potassium sulfate per mu.
Topdressing: Topdressing at the initial fruiting stage: At the initial fruiting stage, apply 7-8 kg of urea and 5-6 kg of potassium sulfate per mu.
Topdressing at the peak fruiting stage: The cucumber fruiting period is relatively long. As cucumbers are harvested, nutrients are continuously depleted, requiring continuous topdressing to ensure nutrient supply. Otherwise, cucumbers will prematurely senesce due to fertilizer deficiency, the effective harvest period will be shortened, and yield will decline. Topdressing can be applied once every 10 days or so, or once every 2 harvests based on the harvesting situation. This promotes fruit enlargement and improves yield and quality.
Foliar Topdressing: During the peak fruiting stage, a 1% urea aqueous solution can be sprayed on the leaves. To supplement insufficient phosphorus and potassium, 0.5% monopotassium phosphate can be sprayed on the leaves. When soil trace elements are insufficient, trace elements should be supplemented promptly by foliar spraying 0.1% borax or multi-element micro-fertilizer 2-3 times.