What is the fastest way to adjust soil alkalinity?

Physical improvement method of soil pH value;

1, when planting crops, we must first find out the suitable pH range of the planted crops, whether we like acidic soil or neutral soil or whether it is suitable for alkaline soil. If the soil pH is not suitable, it needs to be adjusted and improved.

2. For the soil with excessive acidity, 20-25 kilograms of lime can be applied per mu every year, and sufficient farmyard manure can be applied. It is forbidden to apply only lime without farmyard manure, so the soil will turn yellow and thin. Apply it 1-3 months before sowing to avoid affecting crop germination and growth. Plant ash 40-50kg can also be used to neutralize the acidity of the soil and better regulate the water and fertilizer status of the soil.

3. When the soil alkalinity is too high, a small amount of aluminum sulfate (phosphate fertilizer needs to be supplemented), ferrous sulfate (quick effect, but short action time and more application times), sulfur powder (slow effect, but the most lasting effect), highly active humic acid, etc. You can add. The specific application amount is determined according to the soil pH value.

Extended data:

Chemical improvement of soil ph value;

1. Apply phosphogypsum. It can increase the content of active calcium cation in soil, reduce the harm of sodium carbonate and sodium bicarbonate to crops and reduce the PH value. ?

2. Apply fertilizer skillfully. Apply more calcium fertilizer (calcium superphosphate, calcium nitrate, etc.). ) and acid fertilizers (ammonium nitrate, etc. ) Going to saline-alkali land can increase the content of calcium in the soil and activate the calcium in the soil.

3. Applying humic acid improver: These substances are good ion exchangers, which can replace and adsorb harmful ions such as sodium and chlorine, and can adjust the pH value of soil.

4. Use salt inhibitors. After being diluted with water, a continuous film can be formed by spraying it on the ground. This film can prevent water molecules from passing through, inhibit water evaporation, increase ground temperature and reduce surface salt, which has a good effect on crop seedling protection and yield increase.

Baidu Encyclopedia-Soil pH