The Chinese cabbage during the ball stage has been ridged, and the ground between the lines is in a sheltered state. A small microclimate with a small amount of ventilation, high humidity, and weak light is formed. The root system develops to the shallow layer under such moist environmental conditions, and even exposes the ground to form a heel phenomenon. In order to maintain the development of shallow roots, we must always ensure that the soil has sufficient moisture. The lack of earthworms causes dry soil cracking, rooting and rooting phenomena occur, which seriously affect the growth of shallow roots and their ability to absorb water and fertilizers.
The ball stage needs to grow into a huge leaf ball and it needs to absorb a lot of mineral nutrients. These mineral nutrients are absorbed through the transpiration of the leaves and enter the plants with water as the root system absorbs the water. The lack of water will affect the amount of mineral nutrients such as nitrogen, phosphorus, and potassium that enter the body. Water shortage and nutrient deficiency will inhibit the growth rate of the nodule.
The pre-balling period is the peak period of downy mildew, and it is also susceptible to soft rot in the mid and late stages of the ball. The severity of these diseases is closely related to the size of the field humidity. The amount of watering is too large, the humidity is apt to be saturated, the condensation phenomenon is heavy, and the long time of dehydration will aggravate its harm. Therefore, the amount of watering during the ball-breaking period must grasp the principle of small early period. There is a large amount of water in the early and middle periods, but it cannot be flooded with water. It is better to use water for irrigation, not to ditch, and to pour for 7-8 days. The amount of watering at the end of the ball should be slightly smaller to 8 days. Watering is better. The water should not be re-irrigated within 10 days before harvest to reduce the body's moisture and prevent the occurrence of rotten vegetables during storage.
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