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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. Ammonium bicarbonate is very unstable, especially in the high temperature environment enclosed by shed cucumbers. After being applied, it will decompose and produce ammonia gas. When the melons are not fully absorbed in time, the excess ammonia will be vaporized into the shed. When the water droplets of the leaf surface water are encountered, ammonia water is formed, and the lower leaves of the cucumber are yellowed. In severe cases, the green leaves are necrotic, which seriously affects the yield and even the harvest. The diammonium is mainly a phosphate fertilizer, and also contains a certain amount of nitrogen (about 17%), but the diammonium phosphorus is poorly moved into the soil, and it is difficult to move with the water in the furrow, so the effect of topdressing is not good. In order to improve the application effect, it is necessary to first soak the diammonium water for 24 hours, and then use the leachate to top dress. This method is more troublesome. However, the use of underground automatic dark water irrigation combined with topdressing has solved this contradiction. It can send the effective phosphorus dissolved in water directly to the root soil for absorption and utilization of melon, which is an ideal method of topdressing. Potassium sulphate in potash can be used as top dressing, but it should not be applied more to prevent soil acidification. Superphosphate is a phosphate fertilizer, and it is not suitable for top dressing due to poor mobility of available phosphorus. Potassium dihydrogen phosphate is a quick-acting phosphorus potassium that can be used as a top dressing, but it should not be applied more to prevent soil acidification. Superphosphate is a phosphate fertilizer, and it is not suitable for top dressing due to poor mobility of available phosphorus. Potassium dihydrogen phosphate is a quick-acting phosphorus-potassium compound fertilizer, which has good solubility and can be used as top dressing. Potassium chloride can not be used as top dressing.
The number of top dressings should be based on the principle of less and diligent. Each time the amount of fertilizer is assumed to be small, it is generally better to chase 40-50 grams per ridge (30 carp). If the amount of fertilizer is insufficient, the number of top dressings can be increased. This will not cause fat damage, but also ensure high yield.
It is strictly forbidden to apply the hoe in the shed, and it is strictly prohibited to use the shovel (pit) for dry application and ditching. In the high-yield period, every water should be fattened and the high-yield period should be extended.
Foliar topdressing is an economical and effective method of topdressing. Generally, in the middle and late stages of production, it is found that the leaves are thin and yellow when the nitrogen fertilizer is applied. 50 g of urea is used for 15 kg of water. After fully stirring and melting, the leaves are sprayed every 5-7 days. Times, 3-5 times in a row, the effect is very good. When it is found that the melon is serious, the melon leaves are hypertrophy, and the deformed melon is more, 50 g of potassium dihydrogen phosphate is used to stir and dissolve 15 kg of water, and then sprayed on the leaf surface; spraying once every 3-5 days can also receive certain effects. To the later stage of production, the roots can be aging. At the same time, 50 grams of urea and potassium dihydrogen phosphate can be used for 15 kilograms of water, and then half a bottle of sprayed Shibao can be added. After stirring and spraying, the leaves can be used instead of root dressing to increase the disease resistance of cucumber and delay. Aging, fight for high yields in the later period. Note: Under normal circumstances, pesticides should not be added to the fertilizer at the same time, and it is easy to cause phytotoxicity or drug failure. When it is necessary to spray at the same time, it can be sprayed in the morning and sprayed in the afternoon.
Shed planting cucumber
The high-yield topdressing of sheds in cucumber is a material basis for prolonging the high-yield period and winning high yields. The topdressing should be based on the different growth of melons. When the area of ​​the melon is overgrown, the area of ​​the leaf is very large, generally less or no nitrogen fertilizer, should be based on phosphorus and potassium fertilizer; when the melon leaves are small, vines are fine, the leaves are dark green, indicating that the phosphorus fertilizer is excessive and the nitrogen fertilizer is insufficient; Nitrogen application is the main method; when the yellow leaves are found, and there are small yellow spots on the leaves and leaves, it indicates that the potassium fertilizer is insufficient, and potassium can be added in time.
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