Soil acid-alkali identification and regulation
Excessive acidity or alkalinity of the soil will affect the root growth of the plant to a certain extent, which will affect the normal growth of the plant. In addition to the determination of chemical reagents, the following simple method identifies soil acidity.
First, sensory judgments. When the soil is too acidic, the soil will be rotten when it is wet, and when it is dry, it will form a large lump and put some bitter taste into it. In alkaline soils, the land is crusted after rain and loose when dry. The loose soil was put into water and agitated. After clarification, the clear liquid was taken to dry and there was a little white frost on the bottom layer.
Second, according to the instructions of the plant to judge. If there are the following plants on the plot or near the site where the following plants thrive (good growth), they can be compared and identified: Tetranychus cinnafolia, Pinus massoniana, Myrica rubra, Abacus, Azalea like to grow in acidic yellow loam, and they are identified as indicator plants of acid soil. The grasses, garden leaves and cypress, like to grow on the alkaline calcareous soil, was identified as the indicator plant of calcareous soil; like the Suaeda growing on the alkali alkaline soil, was confirmed as an indicator of alkaline soil plant.
If the soil acidity is too large, generally about 25 kg of lime can be produced per year, and adequate farmhouse manure can be applied. Limes should not be applied without applying farmyard manure. Otherwise, the soil will become yellow and thin. 40-50 kilograms of wood ash can also be used to neutralize the acidity of the soil to better regulate the water, fertilizer, gas, and heat conditions of the soil and increase soil fertility for crop absorption and utilization. For alkaline soils, usually 30-40 kg per mu is used as base fertilizer for improvement.
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