A, rotten root causes:

1, rot caused by de-rooting.

Cabbage is a kind of semi-cold vegetables, like mild cold climate, neither cold nor heat resistance, but also like the humid environment, but not waterlogged.

When planted in a hot or cold environment, if this time to encounter the rainy season, heavy rainfall when the soil moisture is too much, will be due to the lack of oxygen and lead to root necrosis, resulting in the emergence of de-rooting.

In addition, cabbage in the pre-growth period if in the high temperature period, there will be a high-temperature type of winnowing root; on the contrary, in the late growth of cabbage, if the temperature is too low, there will be a low-temperature type of winnowing root.

Cabbage root rot

2. Root rot caused by soft rot.

Soft rot is also one of the causes of cabbage root rot, de-rooting planted in higher plots, prone to waterlogging prone to soft rot, additional nitrogen fertilizer application is too much, it may be the plant is infested or damaged by insects, which leads to the invasion of germs invasion of soft rot.

Soft rot mainly affects roots and stems, petioles appear waterlogged, outer leaves lose water and rub, and in severe cases, roots and stems rot.

It fills with a yellowish substance that emits a peculiar foul odor and causes the entire plant to rot.

3. Application of undecomposed organic fertilizer.

Undecomposed organic fertilizer in the soil, under the action of microorganisms will continue to ferment and release heat and ammonia and other harmful gases, resulting in kale root rot; in addition, the immature organic fertilizer contains a large number of larvae, root-knot nematodes and other underground pests and eggs, which will eat the roots of the Chinese cabbage, resulting in root damage and necrosis, which will cause root rot in the Chinese cabbage.

Rotting cabbage

Two, preventive measures:

1, degumming root rot control measures.

Select higher elevation, better drained plots of land planting, so as not to produce too much soil and the phenomenon of sun root, in the pre-growth period, if encountered high temperature climate, you can then go to the shade measures to prevent high temperature mode sun root; late in the growth period, you can cover, fertilizer methods to increase the low temperature, to prevent the low-temperature mode sun root.

When planting, mid-tillage weeding can increase the plant's permeability, so that the root system can breathe and stretch normally.

Additionally, mid-tillage can reduce the risk of frost damage by increasing cold temperatures later in the growing season.

After the rain, drainage should be timely to prevent the phenomenon of waterlogging, and when watering, it is strictly prohibited to flood, so as not to wither the roots.

Rotting root precursors

2, soft rot caused by root rot control measures.

At the base of cabbage leaves close to the roots, there will be water-damaged rotting spots, and gradually move upward, there will also be a distinct rotting odor.

To control the root rot of kale rot, in addition to the above measures to reduce environmental humidity, you can also apply a layer of quicklime on the surface of the cabbage substrate soil, and pharmaceutical control can choose copper preparations or agro-streptomycin, antibiotics in the plant such as bacteriocin.

3, due to organic fertilizer is not fully decomposed caused by kale root rot control measures.

First of all, make sure that the organic fertilizer used is fully fermented and has no manure odor, and at the same time, when applying organic fertilizer, try to apply it evenly to avoid too high a concentration.

To avoid control caused by kale root rot in this form, once used in the soil accompanied by root burning, root rot, basically no effective measures.