Detailed Explanation of Key Technical Points for Blueberry Soil Acidification
Blueberries have extremely demanding soil requirements, preferring acidic soil with good permeability and drainage as well as high organic matter content. Therefore, before planting blueberries, the soil needs to be improved. If the acidification and soil improvement are not thorough or the methods are not appropriate, it will cause leaf chlorosis and yellowing, few and weak new shoots, poor plant growth, and even large-scale tree death. So how should blueberry soil acidification be carried out? Follow the editor to learn about it.
1. Weed control
Controlling perennial weeds is a key factor for long-term successful blueberry production. To deal with perennial weeds, land preparation needs to be carried out one year before blueberry planting. Controlling perennial weeds requires removing all plants, including root systems, cover crops, rotation and fallow cultivation. Many perennial weeds have extremely large root systems and should be forcibly removed in the late growing season. During fallow, annual weeds are allowed to germinate, and timely cultivation reduces the number of weed seeds and lowers the vitality of perennial weed root systems.
2. Lowering soil pH
Soil pH affects the form and availability of various nutrient elements in the soil. Blueberries prefer ammonium nitrogen. If the pH is too high, ammonium nitrogen will be converted into nitrate nitrogen under the action of microorganisms, which is not conducive to blueberry uptake and causes nitrogen deficiency in plants. This leads to stunted growth, leaf chlorosis, poor fruiting and other phenomena. At home and abroad, the method of applying sulfur is generally used to lower soil pH. After being applied, sulfur is oxidized into sulfurous anhydride under the action of sulfur bacteria, and sulfurous anhydride is then converted into sulfuric acid, which plays a role in lowering soil pH. Sulfur application should be carried out one year before planting or at least 4 months before planting. After being applied to the soil, it must decompose over 1-3 months before it can regulate pH, and the effect can last for about 3 years.
3. Raising soil pH
When soil pH is below 4, it is also unfavorable for blueberry growth, so lime is generally used to raise soil pH. Lime needs to be used one year before blueberry planting, and the specific application rate should be determined according to soil pH and soil texture. For example, when the pH is 3.3, 500 kg of lime should be used per mu, which can raise the pH to above 4; when the soil pH is 4, only 60-260 kg of lime per mu is needed, which can also significantly increase blueberry yield.
4. Increasing soil organic matter content
When planting blueberries, the soil organic matter content should be maintained at 2%-4% or adjusted accordingly, so that soil pH changes relatively little, the root system develops well, and there are fewer pests and diseases. Planting or plowing under cover crops 1-2 years before planting can effectively increase soil organic matter for the soil. In addition, peat, decomposed sawdust, compost and others are good sources of soil organic matter, and they can be mixed into the soil before planting. In addition, animal manure can also increase soil organic matter, but it needs to be used after fermentation and decomposition to avoid burning roots or worsening pest and disease damage.
The above is an introduction to blueberry soil acidification techniques. We hope it can help you. To learn more related knowledge, please stay tuned to us.