Water-soluble Soluble Fertilizer (water-soluble fertilizer, referred to as WSF), is a kind of can be completely soluble in water of multiple compound fertilizer, it can be quickly dissolved in water, more easily absorbed by crops, and its absorption and utilization rate is relatively high, the more critical is that it can be applied to drip irrigation and other facilities agriculture, to achieve the integration of water and fertilizer, to save water, fertilizer and labor efficiency.

A large number of elements water-soluble fertilizer, medium elements water-soluble fertilizer, containing amino acids water-soluble fertilizer, trace elements water-soluble fertilizer, containing humic acid water-soluble fertilizer, organic water-soluble fertilizer, etc.

According to the requirements of paying attention to crops, the author believes that water-soluble fertilizers with large amounts of elements must have the following technical characteristics at the same time: water-soluble chelated trace element compositions added to the components should avoid antagonistic effects with phosphorus elements. ●For crops, it has the characteristics of resistance to stress and yield increase, which can significantly improve crop photosynthesis, increase crop yield and quality, increase sugar content, enhance cold resistance, drought resistance, disease resistance, lodging resistance and other resistance properties, and extend shelf life. ● Add high potassium type formula, can quickly meet the fruit, grains and other swelling when the demand for potassium, increase fruit sweetness, improve fruit coloring, extend storage time. ● In the process of fertilization, it is necessary to combine the characteristics of water-soluble fertilizers and master certain fertilization techniques. Avoid direct application, to take the secondary dilution method. Since water-soluble fertilizer is different from general compound fertilizer, farmers cannot follow conventional fertilization methods, resulting in uneven fertilization, burning seedlings and roots, weak seedlings, etc. Secondary dilution ensures uniform fertilizer flushing and improves fertilizer utilization rate. Also strictly control the amount of fertilizer. A small number of times is an important principle, which can meet the characteristics of uninterrupted absorption of nutrients by plants. Water soluble fertilizer than general compound fertilizer nutrient content is high, the amount of relatively small. Because of its quick effect, it is difficult to survive in the soil for a long time, so the amount of fertilizer should be strictly controlled.

Generally speaking, the formula of water-soluble compound fertilizer is more reasonable, the nutrient is more yuan, and it is more targeted to crops. However, unreasonable use in production will also cause waste of fertilizer and even play a negative role. The following are some suggestions for the rational application of water-soluble fertilizers.

1, a small amount of multiple application is an important principle of water soluble fertilizer fertilization, in line with the characteristics of plant roots uninterrupted absorption of nutrients, reduce the loss of leaching caused by a large number of one-time fertilization. A small amount of multiple application is an important reason for the high utilization rate of water-soluble fertilizers. Generally, the amount of each mu is 3~6kg.

2. Pay attention to nutrient balance Water-soluble fertilizers are usually applied, leached or applied through irrigation equipment. Especially under the condition of drip irrigation and fertilization, the root growth is intensive and large, and the dependence on soil nutrient supply is reduced and more dependent on the nutrients provided by drip irrigation. There are higher requirements for the reasonable proportion and concentration of nutrients. If the formula is not balanced, it will affect crop growth.

3, safe application of fertilizer to prevent burn leaves and roots, especially sprinkler irrigation and micro-sprinkler irrigation fertilization, prone to burning leaf phenomenon. The EC value of the fertilizer solution is usually controlled at 1~3 ms/cm, or 1~3kg of water is dissolved in each side, which is equivalent to 350~1000 times of dilution. Or spray water once after spraying fertilizer. When applying water, it is also necessary to prevent excessive concentration from burning roots and seedlings. Some growers add 70 kilograms of water-soluble fertilizer to the pineapple, causing root death and blackening. The insurance method in production is to use a small amount of fertilizer to do experiments and reduce the concentration when it is found to be harmful to the leaves. For some large growers to buy hand-held conductivity meter to monitor fertilizer concentration is a feasible way. Especially more practical for areas with high water source salt concentration.