The size of the head squash produced by the zucchini is due to insufficient supply of photosynthetic products. During the development of the young larvae, sufficient nutrients can not be obtained in time, thereby causing the "tip" phenomenon of the squama head to be enlarged and developed, which is a physiological disease.
There are many reasons for this disease, including excessive fruit set, unreasonable management of fertilizer and water, inappropriate temperature and humidity, and so on. To solve this problem, it is important to take measures to prevent it in advance. Once a “sharp†shape is produced, it will be difficult to improve in the later stages of development. The best way is to remove the tip of the head timely to avoid wasting nutrients. . The following are the main points for taking measures:
1, should be appropriate according to the growth of the plants to take melon strips, for the growth of robust plants generally take 4 to 5 melons per plant can be, must not be a leaf melon, to avoid excessive supply of nutrients due to melon strips appear sharp Head melon.
2. Strengthen fertilizer and water management and appropriately increase the amount of chemical fertilizers. Because the zucchini is a high-yield crop, it is also bred with new melon strips at the same time as it grows. Therefore, in addition to using foot-based fertilizer, it is necessary to pay attention to frequent fertilization of nutrients in order to supplement nutrients. In the melon period, about 30 kg of high-potassium fertilizer can be applied per acre. At the same time, in the squash phase of zucchini, it is not possible to water a lot, and it must not be dry and damp, so as to avoid root injury after watering and affect the absorption of fertilizers by roots.
3, pay attention to the rational use of shade nets, increase the ventilation of the greenhouse. Zucchini does not like high temperature, especially when the leaf temperature is too high, resulting in enhanced respiration and most of the photosynthetic nutrients are consumed, resulting in insufficient supply of nutrients to the melon strips and the appearance of melon strips and slow growth. The daytime temperature during the melon period should not exceed 23°C, and the night temperature should be controlled at about 13°C. At the same time, we must pay attention to the removal of the old leaves of the lower part of the plant (leaves to keep the handle), in order to enhance ventilation, remove moisture, to avoid disease, affect the photosynthetic efficiency of the leaves.
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