In the process of planting fruit trees, melons and vegetables, various foliar fertilizers are often used. Today, I would like to mention that farmers can actually prepare some foliar fertilizer by themselves, and the effect will not be very bad. Among them, the combination of potassium dihydrogen phosphate and urea is a good choice.
1. What kind of fertilizer is potassium dihydrogen phosphate?
Potassium dihydrogen phosphate is a good fertilizer. The nutrient content of phosphorus and potassium is as high as 86%. It is widely used in crop cultivation. Its main function is to supplement phosphorus and potassium nutrition, promote flower bud differentiation, protect flowers and fruits, promote coloring and sweetness, and promote grain plumpness of gramineous crops, which can resist hot and dry wind and improve the ability of rice to resist high temperature. Therefore, potassium dihydrogen phosphate is known as "ace leaf fertilizer".
Potassium dihydrogen phosphate is usually used after fruits and vegetables bloom and bear fruit. The suitable concentration is 600-800 times water. It is suggested that farmers use potassium dihydrogen phosphate to obtain higher purity, better effect and higher safety.
2. Urea is the most easily absorbed foliar fertilizer, but little known!
Urea is more frequently used in agricultural production, and foliar spraying is relatively rare, but urea is actually a very good foliar fertilizer.
As a neutral organic substance, urea has low ionization degree and is not easy to cause cell wall separation. It does little harm to crops, urea molecules are very small, and the ability to pass through the cell membrane is very strong. Urea can quickly enter the leaves and then participate in various metabolism. Generally speaking, it can be absorbed in half an hour after spraying.
3. Potassium dihydrogen phosphate + urea partner, the effect is amazing!
High quality potassium dihydrogen phosphate combined with urea can quickly supplement the three main elements of nitrogen, phosphorus and potassium, and supplement the nutrition consumed by crop flowering. At the same time, the combination of the two is quickly absorbed. Potassium dihydrogen phosphate is combined with urea, especially the roots of crops. When the ability is limited, the effect is more obvious.
4. What are the specific application of Foliar Spraying Potassium dihydrogen phosphate + urea?
Citrus, apple, pear, etc
Spraying potassium dihydrogen phosphate and urea after flowering can quickly supplement nutrition and protect flowers and fruits. Proper supplement during the expanding period is beneficial to fruit expansion. If the fruit trees grow too fast, it is not recommended to add urea.
Usually a bucket of water is 40 kg, you can add 40 g potassium dihydrogen phosphate and 50-100 g urea.
Fruits and vegetables:
Spray after poor growth or fruit setting. Adding 30g potassium dihydrogen phosphate and 50-100g urea to a bucket of water can restore growth and improve fruit setting.
Rice and corn cereal crops:
At booting stage and filling stage, root absorption capacity was poor. If the color is yellow, you can use urea + potassium dihydrogen phosphate combined with pesticide spraying. Spray 50-100 grams of urea + 100 grams of potassium dihydrogen phosphate and 40 Jin of water on 1 mu of land. If possible, 20 grams of organic boron can be added. If and rice grow well, you can also use high-quality potassium dihydrogen phosphate. Its main function is to delay the premature senescence of functional leaves, promote grain fullness, increase yield, and improve heat resistance and lodging resistance.
5. Precautions:
Urea usually requires that the content of biuret should not be too high. It is also suggested to use high purity potassium dihydrogen phosphate to achieve better effect, and phosphorus and potassium source pool is recommended; if it is before and after flowering, boron source pool can be added to protect flowers and fruits.
Borax is generally not recommended for boron fertilizer, because borax is alkaline and is not suitable for mixing with acid potassium dihydrogen phosphate. You can choose the products such as cold water and instant boron.