One, no flower ball
Only long stems, leaves, no kinks, the reasons for the production: 1, early autumn sowing varieties, high temperatures, seedlings without cold treatment, did not pass the vernalization stage, only long stems, leaves, not tied flower balls; 2. During the vegetative growth period, too much nitrogen fertilizer is applied and no seedlings are produced, which results in excessive growth of nutrients. The solution is to sow the plant in season and create conditions for the broccoli to successfully pass through the vernalization stage. During the rosette stage, topdressing nitrogen fertilizers and seedlings are applied to allow vegetative growth to be transferred to reproductive growth.
Second, small flower ball
When harvested, the ball is too small to meet the requirements of the goods. The causes are as follows: 1. The seeds are not pure, the spring sowing varieties are mixed with autumn sowing varieties, the late-maturing late-maturing varieties are mixed with a small amount of early-maturing varieties; 2. The seeds with weak or diseased seeds are weak, and the stems and leaves are not strong. Earlier through the vernalization stage, malnutrition, the formation of small flower balls; 3, fertilizer and water shortage, soil salinity, pests and diseases; 4, poor sowing date, late sowing in autumn, the temperature is lower, the varieties in the seedling stage through the vernalization stage , And forming a small flower ball. Remedy: Use pure seeds with proper variety and sowing date, suitable for water and fertilizer.
Third, the early ball
In the seedling stage, the vegetative growth has not yet achieved a full curd. The reason for this is: prematurely passing through the vernalization stage; the spring is usually used for spring sowing; the spring sowing is too early; the seedling temperature is too low and the autumn sowing is too late. Preventive measures: timely sowing date.
Fourth, blue and white
Green bracts or sepals grow prominently on the surface of the flower ball, making the flower bulb green. Causes: During the expansion of the bulb, the sun shines directly on the surface of the flower bulb. The bulb first turns from white to yellow and then changes to blue. Preventive measures: Bundle the ball in time, or fold off the old leaves to cover the flower ball and prevent direct sunlight.
Fifth, wool flower
The top part of the bulb: The style or filament of the bulb stretches non-sequentially. The reason is that the flower bulb suddenly cools in the mature period, and warming or heavy fog is prone to occur. In summer and autumn when sowing, the sowing date is too early. Before the autumn temperature decreases, the curd is formed. The harvest is not timely, and the temperature suddenly drops. Wool, preventative measures: appropriate sowing.
Sixth, purple flower
As the flower ball approaches maturity, it suddenly cools, and the glycosides in the flower bulb turn into anthocyanins, turning the flower bulb into purple. Purple varieties of seedling hypocotyl prone to occur; autumn sowing of broccoli harvested too late prone to occur. Preventive measures: The surface of the flower ball is uneven and loose. Reasons: the harvest is too late, the flower balls are old, the water and fertilizer are not enough, the growth of the flower bulbs is blocked; the seedlings are excessive, the flower bulbs stop growing, and aging. According to the causes, taking appropriate measures can prevent it.
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