Read the stalk rot of the Three Character Classics without a trace

At present, the late autumn greenhouse vegetable has reached the critical period of planting. If the vegetable grower does not care a little during the planting process, one month later, the vegetables are likely to focus on the phenomenon of dead seedlings, dead trees and serious stalk rot. How should it be? prevention? What problems should you pay attention to during the cultivation of shed vegetables? Prof. Cheng Zhihui of the College of Horticulture, Northwest A&F University, suggested that the “Three Character Classics” should be paid attention to in the autumn when planting vegetables in greenhouses.

"Increase": Increase the amount of organic fertilizer

According to vegetable farmers, more and more fertilizers are being used, and vegetable production is getting lower and lower, which is related to the unreasonable fertilizer habits of vegetable farmers. Before vegetable planting, the vegetable farmer should pay attention to increasing the amount of organic fertilizer and deep application of organic fertilizer. Cheng Zhihui stated that deep application of organic fertilizers mainly increases the content of organic matter in the soil, promotes the formation of soil aggregates, and increases the permeability of the soil. In addition, vegetable farmers should also pay attention to increase the amount of biological fertilizer. Bio-fertilizer can increase the amount of beneficial microorganisms in the soil and inhibit the occurrence of soil-borne diseases. It can also promote rooting, facilitate the formation of strong trees in vegetables, and increase the yield in the later period.

Once vegetables have stalk rot, vegetable farmers should also provide timely nutrition to the vegetables. "Foliar fertilizer can be sprayed properly," said Cheng Zhihui. Spraying foliar fertilizer can increase the disease resistance of vegetables. Vegetables have high calcium content and the cell wall will be thick and not prone to wounds. The use of fertilizers before planting and fertilizer distribution methods, killing two birds with one stone, can prevent the occurrence of stalk rot, but also help vegetables to supplement the nutrition, the growth of vegetables in later stages of great help.

"Decrease": Reduce chemical fertilizer use

When planting former crops in greenhouses, organic fertilizers are often used more, and the amount of later-stage fertilization is larger. In this case, when delaying the colonization of greenhouse vegetables, the use of chemical fertilizers or chemical fertilizers should be reduced. In high temperature weather, the chemical fertilizer has high solubility in the soil, and in addition, the salt content in the soil is high, and excessive application of chemical fertilizers is not conducive to the growth of the root system.

"Bogey": Avoid full shed black mulch

Cheng Zhihui said that in the current situation, some problems with seedlings are often caused by improper coverage of vegetable mulch. The environmental conditions in the late summer and early autumn are conducive to the growth of vegetables, which is also conducive to the growth of weeds. Many vegetable farmers often cover black mulch after planting to prevent weeds. After covering the black plastic film, the plastic film blocks the evaporation of water, and the humidity on the ground is high. This leads to high temperature under the plastic film. A large amount of water vapor evaporates from the base of the stem, which can easily burn the stem base of vegetables and create opportunities for the infection of pathogenic bacteria. At present, if the black mulch film is laid, it should not be connected, keep a certain distance from the stem base of the plant, and press the stem around to prevent the hot gas from being discharged from here. If the temperature in the greenhouse is too high, it is not recommended for the vegetable growers to cover the plastic film. After the high temperature, the plastic film can be covered.

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