Is it better to spread or bury compound fertilizer? (Is it better to spread or bury compound fertilizer?)

Should compound fertilizer be spread or buried?

In principle, it is better to bury compound fertilizer instead of spreading it on the ground , because there will definitely be losses if it is spread on the surface, such as the volatility of nitrogen fertilizer will be washed away by rain, and there are also the characteristics of phosphorus and potassium.

For example, potassium is too lazy and has poor mobility. When it is spread on the surface, it cannot contact the crop roots, so its utilization rate will decrease. Phosphorus is even lazier and has even poorer mobility. In addition, phosphorus is easily fixed by other elements in the soil. In addition, some phosphorus fertilizers are poorly water-soluble or must be dissolved in weak acid to be absorbed by crops.

The roots of crops secrete weak acid when they grow, which can dissolve some phosphate fertilizers. If you spread it on the surface, the roots will not be exposed to it, thus reducing the utilization rate.

How to use compound fertilizer

Because compound fertilizer takes effect slowly and lasts for a long time (the fertilizer effect period is up to 3 months, and generally takes effect 10 days after application), compound fertilizer is suitable for base fertilizer (bottom fertilizer) and should not be used for topdressing. Try to avoid using compound fertilizer during the seedling and crop period and supplementary fertilizer in the middle and late stages. Instead, use quick-acting nitrogen fertilizers, such as urea or ammonium bicarbonate.

In addition, compound fertilizers containing nitrate should not be used on leafy vegetables and paddy fields; compound fertilizers containing ammonium ions should not be applied on saline-alkali land; compound fertilizers containing potassium chloride or chloride ions should not be used on chlorine-sensitive crops or saline-alkali land; compound fertilizers containing potassium sulfate should not be applied in paddy fields and acidic soils.

Some people ask, can compound fertilizer be applied with water? In fact, it is not difficult to answer this question after carefully analyzing the properties of compound fertilizer. Try not to apply compound fertilizer with water, as this will reduce the fertilizer efficiency and cause waste.

This is because among the three nutrients of nitrogen, phosphorus and potassium in compound fertilizer, nitrogen is most easily lost with water, while crops absorb nutrients mainly through their roots, which are all in the soil. Most of the nutrients in the compound fertilizer after flushing are enriched in the soil surface and are difficult to combine with the crop roots. Therefore, the fertilizer effect will be greatly reduced.

The correct way is to apply compound fertilizer into the soil and cover it with soil to avoid exposing the compound fertilizer.