Wetting only the root layer is an effective measure to improve the utilization efficiency of water-soluble fertilizer
Water-soluble fertilizers refer to water-soluble compound fertilizers, including both solid and liquid forms. Generally speaking, the water-soluble compound fertilizer formula is more reasonable, the nutrient is more diverse, and the crop is more targeted. However, irrational use in production can cause waste of fertilizer and even negative effects.
A small amount of multiple application is the most important fertilization principle of water-soluble fertilizer, which is consistent with the characteristics of uninterrupted absorption of nutrients by plant roots, and reduces the leaching loss caused by one-time large-scale fertilization. A small amount of multiple application is the most important reason for the high utilization rate of water-soluble fertilizer. Generally, the amount per acre is 3 to 6 kg. The seedling period is small, and there are many strong growth periods.
Note that nutrient-balanced water-soluble fertilizers are usually applied, applied or applied by irrigation equipment. Especially under drip irrigation and fertilization conditions, root growth is large and dense, and the nutrient supply to the soil depends more on the nutrients provided by drip irrigation. This is especially true for sandy soils, which have higher requirements for the reasonable proportion and concentration of nutrients. If the fertilizer formula is not balanced, it will affect crop growth and produce deficiency syndrome.
Safe application, especially sprinkler irrigation and micro-sprinkler fertilization, should pay attention to prevent fertilizer from burning leaves and roots. Usually, the EC value of the soluble salt concentration of the fertilizer solution is controlled to be 1 to 3 ms/cm (milligram per centimeter), or 1 to 3 kg per square water, which is equivalent to 350 to 1000 times dilution, or spray water once after spraying the fertilizer. It is also necessary to prevent excessive concentration of burned roots when spraying. The safest method of production is to use a small amount of fertilizer to test and find that the concentration is reduced when there is damage to the blade. Some large growers can purchase hand-held conductivity meters to monitor fertilizer concentrations, especially in areas with high water source salinity.
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