How do you say it? For shed-planted cucumbers, if the melons grow vigorously and the leaf area is extremely large, generally less or no nitrogen fertilizer should be used. Phosphate-potassium should be used as the main factor. When the leaves are small, the vines are fine, and the leaves are dark green, the phosphorus excess is indicated. Insufficient nitrogen fertilizer should be based on nitrogen-seeding fertilizer; when yellow leaves are found on the leaves and small yellow spots on the leaves, it indicates that potassium is insufficient, and potassium can be added in time.
The application of nitrogen fertilizer should be based on urea and ammonium nitrate. Sulfur ammonium cannot be applied. Because ammonium sulfate is a physiological acid fertilizer, when applied in a large amount, the soil is acidified and plated, which affects the subsequent vegetable production. In addition to accelerating soil acidification and compaction, ammonium chloride is also harmful to cucumbers and must be strictly prohibited.
For the fertilizers such as ammonium bicarbonate, since ammonium bicarbonate is easily decomposed, it is unstable in itself, especially in the high temperature environment where the shed cucumber is closed. After the application, the ammonia gas is decomposed quickly, and when the melon is not fully absorbed in time. Excess ammonia will be vaporized into the shed. When the water droplets on the leaf surface are encountered, ammonia water is formed. The lighter leaves the lower leaves of the cucumber yellow, and the green leaves are necrotic, which seriously affects the yield and even the harvest.
What are the precautions for fertilizing cucumber in greenhouse? When the cucumber is planted in the late stage, the roots are senescent, and urea and dihydrogen phosphate can be used simultaneously to carry out root topdressing, increase the disease resistance of cucumber, delay aging, and strive for high yield in the later stage. Under normal circumstances, pesticides can not be added to the fertilizer at the same time, which is easy to produce phytotoxicity or drug failure.
This article URL: What are the precautions for shed planting cucumber fertilization?
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