Technical points of efficient fertilizer application in greenhouses

The cultivation of greenhouse cucumbers in the high-yielding period is the material basis for prolonging the high-yield period and winning high yields. Top dressing should be based on different growth trends. Melon grows luxuriant, when the leaf area is very large, generally less or no nitrogen fertilizer, phosphorus and potash fertilizer should be the main; when the melon leaves small, fine, dark green leaves, indicating excessive phosphate fertilizer and nitrogen deficiency, should be chased Nitrogen fertilizer is dominant; when the yellow leaves are found, there are small yellow spots on the leaves, indicating that potassium is insufficient and potassium can be added in time.

Topdressing nitrogenous fertilizers is mainly based on urea and ammonium nitrate. Ammonium sulfate cannot be used. Ammonium sulfate is a physiologically acidic fertilizer. When applied in large amounts, the soil is acidified, affecting subsequent vegetable production. In addition to accelerating soil acidification and hardening, ammonium chloride is harmful to cucumbers, and it is strictly prohibited. Ammonium bicarbonate is very unstable, especially in the closed high temperature environment of greenhouse cucumbers. It will soon decompose and produce ammonia when it is applied. When the melon pods are not fully absorbed in time, the excess ammonia gas will escape into the shed. When the leaf surface water droplets are encountered, ammonia water is generated, and the light leaves the lower leaves of the cucumber yellow, and when the leaves are severe, it will cause necrosis, which will seriously affect the yield and even the harvest. Diammonium is mainly a phosphate fertilizer, but also contains a certain amount of nitrogen (about 17%), but diammonium phosphorus is poorly applied to the soil, and it is difficult to move with the water in the ditch, so it is not good for topdressing. In order to improve the application effect, diammonium must first be soaked in water for 24 hours and then topdressed with leachate. This method is more troublesome. However, the use of underground automatic infiltration and irrigation with water to solve this contradiction. It can directly dissolve the available phosphorus dissolved in the water into the root soil for absorption and utilization by quails. This is an ideal top dressing method. Potassium sulfate in potash fertilizer can be used as topdressing, but it is not suitable to apply more to prevent soil acidification. Superphosphate is a phosphate fertilizer and is not suitable for topdressing due to poor mobility of available phosphorus. Potassium dihydrogen phosphate is a quick-acting phosphorus-potassium compound fertilizer with good solubility and can be used as top-dressing fertilizer. Potassium chloride also cannot be topdressed. The amount of topdressing should be based on the principle of less and more ground. The amount of topdressing can not be much, and it is generally good to chase 40 grams per ridge (30 strains) each time - 50 grams. If the amount of fertilizer is insufficient, the frequency of topdressing can be increased. This will not produce fertilizer damage, but also ensure high yields. Cultivated cucumbers in greenhouses are not allowed to be shaved and dried and applied dryly. They must be applied along with gutters. During the high-yield period, seawater must be fertilized and the extension of the high-yield period should be maintained.

Foliage topdressing is an economical and effective topdressing method. Usually in the middle and later stages of production, it is found that when the leaves are thin and yellow, the nitrogen fertilizer is chased out. Use 50 grams of urea and 15 kilograms of water. Spray the leaves thoroughly after mixing and dissolving. Every 5 days - 7 days, 3 times in a row - 5 Times, the effect is very good. When it was found that the melons were severe, the melon leaves were hypertrophy, and the melons were often misused, spraying 50 kg of monobasic potassium phosphate to 15 kg of water and spraying the foliar after spraying dissolved them for 3 days to 5 days, and they also received certain effects. In the later stage of production, the roots are senile. At the same time, 50 grams of urea and potassium dihydrogen phosphate may be used for 15 kilograms of water. Then half bottles are sprayed and sprayed to dissolve the sprayed leaves. It can replace the top dressing and increase the disease resistance of cucumbers. Aging, strive for high yield in the later period. Note: Under normal circumstances, pesticides can not be added to the fertilizer at the same time, it is easy to produce phytotoxicity or drug failure. When spraying is needed at the same time, it can be sprayed in the morning and sprayed in the afternoon.

Food Additive

Food Additive,Natural Food Additives,Acid Food Additives,Food Grade Additive

Allied Extracts Solutions , https://www.alliedbiosolutions.com