After sowing and planting, vegetables often need more topdressing to meet the needs of their growth and development. The amount of topdressing generally accounts for 1/3 or more of the total amount of fertilizer applied during the whole growth period of crops. Some people use compound fertilizer for topdressing, while others use water-soluble fertilizer. So why do you suggest topdressing instead of compound fertilizer? Magnesium sulfate monohydrate color particles

1. Nutritional composition

Water soluble fertilizer refers to compound fertilizer completely soluble in water, quick acting fertilizer, good water solubility, no residue, completely water soluble, which can be directly absorbed and used by the roots and leaves of crops. The proportion is diverse, including water-soluble fertilizers containing large, medium and trace elements, and functional water-soluble fertilizers containing amino acids, humic acids, microbial agents, etc. The proportion is diverse, including balanced type, high nitrogen type, high phosphorus and high potassium type, rooting type, fruit expanding type, etc., with comprehensive nutrition.

2. Effective period and fertilizer effective period

Water soluble fertilizer is a kind of multiple compound fertilizer. Borrow the effective period of big fertilizer. Ammonium bicarbonate is effective on the same day, and the effective period of fertilizer is 15 days; Ammonium chloride takes effect in three days, the fertilizer effect period is 25 days, and the fertilizer is removed later. Urea takes effect in seven days, and the fertilizer effect period is 45 days. The compound fertilizer will take effect after ten days, and the effective period is 90 days.

Generally, the effective period of water-soluble fertilizer is about 5-7 days, and nutrition is rapidly supplemented. The effective period of water-soluble fertilizer is 30-45 days, which is shorter than that of compound fertilizer. However, water-soluble fertilizer has great advantages in supplementing a large amount of nutrients required by crops at a certain period, and will not cause nutrient waste.

3. Effect and utilization rate

Water soluble fertilizer is a quick acting fertilizer. The absorption rate of crops is fast, the absorption and utilization rate is high, and the application method is appropriate. Generally, it can reach about 90%, up to more than 95%, almost all of which are absorbed, while the absorption and utilization rate of traditional compound fertilizer in the process of crop growth is only about 60% at most.

In addition, the harmful heavy metal pollution and chloride content in water-soluble fertilizer are less than those in traditional compound fertilizer, so as to avoid soil nutrient imbalance, structural damage and other phenomena. If ordinary fertilizers are used in large quantities for a long time, they will cause soil hardening and acidification, and the fertility will also drop a lot. Some functional fertilizers in water-soluble fertilizers can also improve the soil.

Therefore, topdressing still requires dissolving fertilizer with water! Knowing the advantages of water-soluble fertilizer in vegetables, it is also crucial to select the right fertilizer when using fertilizer.