1. Severe yellowing of the leaves. The leaves tend to yellow from the period of fruit swelling. After severe pruning in summer, the leaves will turn yellow. After two to three and a half months of pruning, they will gradually turn green. Some may not turn green normally even when the leaves fall. Cannot form enough flower buds. The reasons for this phenomenon are more complicated, mainly in the following aspects: First, the large pruning degree in the summer after harvest is too heavy and too urgent, and no nutritionally balanced branches are left; second, because the greenhouse is unveiled too quickly, and it does not follow the step by step Principles; the third is that there are problems in soil management; the fourth is the poor lighting caused by the aging of the shed film.

Solution: (1) The yellowing phenomenon caused by excessive pruning should be carried out step by step after harvesting. Each resulting branch group can be pruned on one side of the branch and grow 5 cm (about 10 days after pruning). ) And then pruning the other branch group, and at the same time, 3 to 5 branches that have not stopped growing will not be pruned to balance nutrition. (2) Don't rush to open the shed after harvesting. When the new shoot grows more than 10 cm, completely shed the shed. (3) In the soil management, more coarse organic fertilizers (green manure, grass manure, straw, etc.) should be applied, small ditch irrigation, and plastic film covering should be kept to 30% of the ground without covering. Measures such as soil drainage and timely drainage in the rainy season after the shed is uncovered improve the soil and increase the permeability of the soil to ensure that the soil contains more than 10% oxygen; formula fertilization, do not apply nitrogen or phosphorus fertilizers.

2. Severe pollination and fruit drop. Poor pollination and poor fertilization are important reasons for fruit drop. First, the self-pollination has a low fruit setting rate. Second, high humidity pollen cannot be normally transmitted.

Solution: Firstly, artificial pollination should be strengthened, and pollination should be performed once a day at 17 ° C when the pollen spreads a lot. You can also use bee pollination. Second, watering is strictly prohibited during the flowering period, and the humidity is controlled at 50% to 60%. At the same time, 500 times of borax solution and 300 times of urea can be sprayed during the flowering period to promote pollination and fertilization.

The amount of cold required is not enough, and the fruit setting rate is low. The reason for this situation is that the shed is heated prematurely, which results in insufficient cold demand, late germination, irregular buds and flowers, deformed flower organs, low fruit setting rate or flowers not opening, and even the buds die. Fall off.

Solution: First understand the cold demand of the cultivar, then record the temperature change after falling leaves, and accumulate the temperature hours below 7.2 ℃. When the cold demand of the variety is reached, the shed can be heated up or forced to sleep, that is, Cover the shed film before the beginning of November (Lidong), cover it in the daytime, and cool down in the evening to keep the temperature in the shed below 7.2 ° C to -2 ° C or higher until it reaches the required cooling capacity. 10 to 20 days earlier than natural dormancy. The sleep time can be shortened. Generally, after the low temperature of 35 to 40 days, the curtain can be warmed up.

3. Late maturity and poor quality are caused by: 1. Inadequate growth period; 2. Partial application of nitrogen fertilizer; 3. Physiological potassium deficiency and late ripeness; 4. Insufficient light and so on.

Solution: First, cover the shed properly in advance, and increase the temperature in advance while ensuring the amount of coldness required; second, enter the expansion period and apply high-potassium compound fertilizer.

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