The reasons for the formation of malformed melon: lack of light, high temperature at night, small temperature difference between day and night, irrigation water suddenly more and less frequent, easy to appear thin waist melon. Plants grow too profusely, causing melons and locusts to grow out of tune, or melon pods to get sick. The lack of nutrition during the growing period of the cucumber, the weak growth of the plant, or the serious harm caused by the worms, downy mildew and other pests, can easily grow into sharp-edged melons. During the growing period of cucumber, the temperature is high, the moisture is large, the plant grows more vigorously, the melon strip grows faster, or in the flowering stage of the cucumber, the temperature is low, the rainy weather, the ground temperature is low, and the pollination is bad. The apex of the pollination first enlarges, the nutrition is insufficient, or the moisture Insufficient, uneven development of ovules, melon seed formation at the top, melons grow thicker, and melon seeds in the lower part of the seedless or seedless, melons grow thin, become a big pot cucumber. Cucumbers encounter low temperatures during flower bud differentiation, often forming ovary or four ovary locules, and they easily grow into short deformed "melon balls." Due to the excessive application of nitrogen fertilizer or insufficient phosphorus and potassium fertilizers, especially the sudden excessive application of nitrogen fertilizer causes the plants to grow in length, and the melons are not neat, and the melons on the side branches and weak branches tend to have bitter taste. In addition, in the case of low-temperature, low-light weather, especially cloudy days, cucumber roots absorb less water and nutrients, and melon strips grow slowly, often accumulating more bittersin the roots and lower melons, resulting in bitter melons.
Prevention of malformed melon measures:
1. Control the temperature. In the cucumber seedling stage, especially before two true leaves, the temperature difference between day and night is required to be larger, the night temperature should not be lower than 12 °C, so as to avoid the formation of malformed ovary, grow into a malformed melon. The temperature difference between day and night of the cucumber melon period is also larger. The daytime temperature during the melon period should not exceed 30°C. The night temperature should be 16°C18°C in the middle of the night and 13°C15°C in the middle of the night. The ventilation should be strengthened to prevent over 30°C high temperature. Normal pollination and fertilization, so that the thickness of melons grow well-proportioned.
2. Reasonable fertilization. Apply enough base fertilizer and apply organic fertilizer and phosphorus and potassium fertilizers. Apply a small amount of fertilizer to the top dressing, collect the fat after the harvest, and then recover the fertilizer every 10 days or so, strictly control the amount of nitrogen fertilizer, and use the formula fertilization technique to determine the ratio of nitrogen, phosphorus and potassium during fertilization. At 5:2:6, it prevents the plants from becoming leggy. In the middle and late stage, 0.2% potassium dihydrogen phosphate solution was sprayed on the leaves to prevent premature aging.
3. Reasonably water. During the growth period of cucumber, especially in the period of squashing, it cannot be considered that the cucumber is used for fertilizer and fertilizer, and a large amount of fertilizer and water are sprayed, resulting in “running squattingâ€. Sunny days should pay attention to watering to prevent water shortages. To control the amount of watering watering, especially in the fruit expansion period should not be excessive watering.
4. Strengthen pest control. Diseases such as cucumber downy mildew, blight, and gray mold must be observed during the initial stage of cucumber growth. Attention should be paid to the detection of central diseased plants, and timely removal of diseased leaves to prevent infection from spreading. Can be used 10% of Kejia suspension 10001500 times, 64% anti-virus WP 400500 times or 72.2% Precike 600700 times spray control, 710 days to spray once, use 34 times. Prevention and treatment of diseases can also adopt the method of spraying aerosols, without increasing the humidity in the greenhouse, using 45% chlorothalonil smoke agent per acre and placing 250 grams of the chlorothalonil smoke agent on the shed, and then igniting the cessation of smoking from the inside out in the evening. Smoked, generally 710 days cast 1 time, used 23 times. Aphid and whitefly can be sprayed with 10% imidacloprid wettable powder.
In addition, it is necessary to promptly remove malformed melons so that the nutritional supply can develop normal melon strips.
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