Latest Winter Vegetable Chemical Root Drenching Methods and Precautions
After entering winter, the temperature inside greenhouses is low and the humidity is high, and such an environment very easily leads to the occurrence of diseases. To control root diseases, choosing chemical root drenching is one of the most effective measures, but when carrying out root drenching you must pay attention to technique, otherwise it may backfire. Now let's take a look together with the editor.
I. Winter Vegetable Root Drenching Methods
1. Soil organisms must be taken into account
After choosing a chemical for root drenching, it must not destroy the biological community and ecological balance within the soil. For example, in greenhouses where microbial fertilizer has already been applied, try not to use fungicides for root drenching, so as to avoid killing the beneficial microorganisms in the microbial fertilizer and causing the microbial fertilizer to lose its fertilizing effect. If the vegetables have already developed disease and a chemical must be used for root drenching control, then there is no need to consider whether the beneficial microorganisms are harmed, so as to avoid losing the greater for the lesser.
2. Do not water before root drenching
Most root diseases spread with water, causing a large area of plants to develop disease. In addition, watering also causes soil permeability to decline, causing the vegetable roots to lack oxygen, producing root rot, reducing disease resistance, speeding up pathogen infection, and causing plant death.
3. Do not water immediately after root drenching
If watering is done immediately after root drenching, the chemical solution will be quickly diluted, thereby reducing the bactericidal effect. If there is a lack of water and drought, a small amount of water can be poured in the furrow, with the water level reaching one third of the ridge height, but it must never cover the ridge surface.
II. Precautions
1. Chemical selection must be reasonable
When selecting chemicals, choose ones with strong targeting and relatively good control effects. Do not use chemicals blindly, so as to avoid delaying the control period.
2. Concentration must be appropriate
⟦NL>When using chemicals, you must pay attention to the concentration, especially when fungicides are mixed with humic acid liquid fertilizers or hormones that stimulate root development. The chemical solution concentration must not be higher than a 800-fold dilution, so as to avoid phytotoxicity caused by excessively high concentration.
3. Pay attention to sprinkling water before and after root drenching
It is not suitable to sprinkle water before and after root drenching. This is mainly because root diseases have already occurred, and sprinkling water at this time will cause the pathogens to spread over an area with the water, causing more vegetables to become infected.
4. Do not apply microbial fertilizer by flushing before and after root drenching
Fungicides will more or less affect the microorganisms in microbial fertilizer, so before and after root drenching try not to apply microbial fertilizer by flushing. In plots where microbial fertilizer has already been applied, use as little fungicide as possible when controlling diseases, so as to avoid causing the microbial fertilizer to lose its proper effect.
5. Timely remedy for phytotoxicity
If plants show wilting and yellowing after root drenching, these are obvious symptoms of phytotoxicity and need timely remedy, so as to avoid causing greater losses. You can immediately irrigate once with water to dilute the chemical solution concentration, and at the same time spray a remedy chemical to prompt the root system to recover as quickly as possible.
The above is an introduction to winter vegetable chemical root drenching methods and precautions. We hope it can help you. To learn more related knowledge, please stay tuned to us.