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Vegetables often cause rotten roots during seedling stage, which affects the normal growth of seedlings. The general symptoms are as follows: the roots are rust-colored rot, the seedlings grow slowly after emergence, no new roots are formed, and some even stop growing, the leaves are grayish green, and gradually turn yellow, and the whole plant eventually withered and died. The main control measures are as follows:
Note that after the cotyledons of the ventilated vegetable seedlings are unfolded, choose a clear and warm weather to uncover the cover and ventilate, and evenly apply a layer of fine dry soil to the seedbed. This can reduce the humidity of the bed soil and increase the temperature.
When controlling the amount of watering in nursery fields such as greenhouses or greenhouses, it is generally not necessary to water the seedbed when there is no obvious drought (that is, when the surface soil is held in groups). When there is obvious drought, it is best to spray a new high-fat film to moisturize and prevent bacterial infection. .
Adding organic manure such as decomposed chicken manure before applying organic fertilizer to improve seedling disease resistance and seedbed soil temperature, and reduce seedling incidence. Before seedling, mix the decomposed fine-quality high-quality hot farmyard manure and bed soil in the seedbed to the nursery soil. Do not apply nitrogen fertilizer as the base fertilizer in the seedbed. It should be noted that the organic fertilizer should be fully decomposed to avoid the loss of "burning seedlings" and nutrients.
Using roots + tree guards to root the roots, can induce virus agglomeration, target the generals to protect the tree, inhibit root-transmitted virus infection and leaves and fruits, and maintain the health of the plant transport system.
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