Excessive nitrogen supply hinders crop growth and produces toxic nitrite
Nitrogen fertilizer is the most needed chemical fertilizer in agricultural production, which plays an important role in increasing crop yield and improving the quality of agricultural products. However, if the supply is too much, it will make the crops green late ripening, prolonged growth period, mainly in thin cell walls, soft plants, vulnerable to mechanical damage (lodging) and disease invasion (such as barley brown rust, wheat head blight, rice brown spot). At the same time, applying large amount of nitrogen fertilizer can also make cotton and boll scarce and easy to fall off, sugar production rate of sugar beet root drop, fiber crop yield and fiber quality decrease.
Special attention should be paid to that excessive nitrogen fertilizer produced vegetables “n”, the edible part, such as its stem leaf were nitrate pollution, can make the nitrate content in vegetables is amplified, and then converted to nitrite, and nitrite is highly toxic substances, it can cause human body cell hypoxia, and can cause cancer, great harm.
Excessive phosphorus application results in chlorosis of soil-deficient crops
Application of ordinary superphosphate can not only provide phosphorus nutrition for crops, but also make crops get sulfur nutrition. But because of its low phosphorus content and many by-components, heavy superphosphate is commonly used in the production of phosphate fertilizer. Heavy superphosphate does not contain impurities such as calcium sulfate, so that the content of phosphorus is greatly increased, becoming a high concentration of phosphate fertilizer. Therefore, perennial application of heavy superphosphate will naturally lead to sulfur deficiency.
Crop sulfur deficiency symptoms and nitrogen deficiency are very similar, the main feature is leaf chlorosis, but from the subtle expression, they are different. The symptoms of nitrogen deficiency start first from the lower old leaves, while the symptoms of sulfur deficiency start from the upper new leaves, resulting in green and yellow leaves.
Therefore, in order to reduce the occurrence of soil sulfur deficiency, ordinary superphosphate should be selected when planting sulfur-loving crops, or alternate application of ordinary superphosphate and heavy superphosphate should be adopted.
Giving excess potassium affects crop growth and destroys soil structure
Potassium fertilizer is a kind of fertilizer for plant growth. Proper application of potassium fertilizer can plump grain, increase root of potato and potato, increase sugar content of fruit, increase tillering of rice, wheat and other gramineous crops, thicken stems and roots, make plants not prone to lodging, and enhance drought resistance, cold resistance and disease resistance.
Potassium fertilizer is a kind of fertilizer for plant growth. Proper application of potassium fertilizer can plump grain and promote the growth of potato, potato and other roots
Although potassium fertilizer has many benefits, but not the more the better, excessive application will bring adverse effects on crops: excessive application of potassium fertilizer will cause a decrease in the absorption of magnesium and calcium in crops, causing the occurrence of leaf vegetable “rot heart disease”, apple “bitter pox” and other diseases; Excessive application of potassium fertilizer will also hinder the growth of crops, resulting in the crop prone to lodging and other symptoms; Excessive application of potassium fertilizer will cause excessive harmful metals and bacteria in some plots, destroy soil nutrient structure and balance, and lead to deterioration of soil properties and water pollution. Excessive application of potash fertilizer will also reduce the production of crops, seriously weaken the production capacity of crops, reduce the yield.
Post time: Dec-20-2021