The weather is getting colder and colder, improper watering can easily cause root damage, which is not conducive to the growth of vegetables. Root retting in particular occurs in the low temperature seasons of autumn and winter, coupled with continuous rainy weather after watering, the ground temperature is too low, and the seedlings will wilt. Over time, retting will occur. In addition, the soil is compacted or sticky soil, if the amount of water is too large, the phenomenon of rooting is also easy to appear. So, how to water to avoid the occurrence of retting?
Watering knowledge
Remind vegetable farmers not to water daily and avoid flooding, otherwise the moisture in the soil will quickly turn from extremely dry to extremely waterlogged. Excessive moisture will squeeze the air out of the soil out of the soil. In the case of excessive watering If the root system is surrounded by water for a long time and is in a state of hypoxia, the root system will be injured. Especially for crops with shallow root systems such as cucumbers and peppers, once the watering is too large, it is easy to retreat and damage the roots. Water with the smallest amount of water frequently, and drip irrigation under the film can be used if conditions permit. Generally speaking, it is most appropriate to maintain soil moisture between 50%-85%, which can not only meet the roots' demand for moisture, but also maintain the oxygen content of the soil.
Pay attention to the weather forecast before watering. It should be done on a sunny day. After watering, you must ensure that there are at least 2-3 sunny days. The watering time is before 10:00 in the morning, when the ground temperature and water temperature are not much different. , After watering, the ground temperature will not change greatly, which can reduce the damage to the root system and prevent the occurrence of root retting.
Sand and clay watering
Cohesive soil, if watering more frequently, the soil has more water and less oxygen, which is not conducive to the growth of roots. Especially in the case of large evaporation, it often results in a dry top and bottom wet soil, giving the vegetable growers the illusion that they should be watered, resulting in frequent watering and causing retting. On the contrary, for sandy soil with good water permeability, if the water is frequently watered with small water, the upper part will be wet and the lower part will be dry, which is also not conducive to the growth of the root system.
Therefore, due to the good water retention of cohesive soil, the watering interval can be appropriately extended. At the same time, hoeing should be carried out in time when the surface is slightly dry after watering, so as to minimize the harm of retting roots. When hoeing, you can judge the growth range of the root system according to the size of the seedlings. Lightly hoe the hoe closer to the root system. The farther the distance, the depth of the hoe should increase. Watering sandy soil requires a combination of large and small water. After a few small water runs, a large amount of water is appropriate to replenish the water in the deep layers of the soil and promote rooting.
Relief of retting and wounding roots
Once the phenomenon of retting occurs, management should pay attention to timely hoeing and loosening the soil to increase soil permeability. After the soil is slightly dry, use hymexazol water + rooting agent or metalaxyl + chitin for flushing. Or irrigate the roots to avoid infection by pathogenic bacteria.
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