Can urea be used as foliar fertilizer?

Urea is a nitrogen fertilizer with the highest nitrogen content at present. It is a neutral organic compound fertilizer, which is suitable for all kinds of soil and plants. Nitrogen plays a very important role in the growth demand of plants, and plants mainly rely on roots and leaves to absorb nutrients. Therefore, urea mainly containing nitrogen has a good effect both as foliar fertilizer and soil fertilizer, especially in the early stage of plant growth. However, some problems should be paid attention to when it is used as foliar fertilizer. Tell everyone about it.

Characteristics of urea as foliar fertilizer Urea itself is a quick-acting fertilizer, which is easily soluble in water and has strong moisture absorption. The moisture retention of leaf surface can make fertilizer more easily absorbed by plants, so it can play a more direct and effective role as a foliar fertilizer, saving time and effort. Moreover, because it is a neutral organic matter, it will not cause too much damage to the leaves and stems of plants, and because it is easy to spread inside plants, it will be absorbed faster.

In addition, some green-leaf plants need a lot of nitrogen fertilizer in the early stage of growth. If soil fertilization is used in this period, the effect is slow, because it needs to be absorbed in the soil for a period of time, so the absorption speed is relatively low and slow, which can not meet the demand of plants for a large amount of nitrogen fertilizer. Therefore, it is best to use urea mainly containing nitrogen as foliar fertilizer, and the effect is better.

Precautions for the use of foliar fertilizer Attention to concentration: When using urea as foliar fertilizer, the first thing to consider is the concentration ratio. If it is too thick, it will easily burn plants, and if it is too light, it will not have a good fertilization effect. Each plant has different needs for fertilizer. For example, the spraying concentration of wheat, rice, melons and other cereals and some vegetables such as green leaves is different. The former is slightly higher than the latter, while the concentration of some fruit trees is lower than that of green leaves, and the lowest is similar to tomatoes, watermelons, eggplant and other fruits and vegetables. For the actual ratio data of each factory, friends can refer to relevant professional materials, so I won't write them in detail here.

Pay attention to the spraying time: the spraying time of foliar fertilizer also has related requirements. Generally, it is best to apply fertilizer in the morning or evening, mainly to avoid the high temperature and too much sunshine at noon, which will easily make the moisture of foliar fertilizer evaporate too fast and affect the absorption of plants. It is best to pay attention to the weather forecast before fertilization, and it is advisable to choose sunny or cloudy days without rain to avoid rain after fertilization, which will lead to ineffective fertilization and waste. Foliage fertilizer can't be sprayed every day, which will be harmful to plants. Spray once every 0/5-20 days in general.

The above introduces some characteristics of urea as foliar fertilizer and some matters needing attention when spraying foliar fertilizer, so the requirements of plants for fertilizer and the small details of operation can not be ignored, which determines the growth of plants and the harvest of crops.