The highest temperature is controlled at 30~35℃, and the lowest temperature is controlled at 12~ 15℃. After the seedlings are delayed, they enter normal management, and the temperature is controlled at 28~32℃, 12~ 10℃. Control technology of reproductive growth and nutritional growth of cucumber in greenhouse after overwintering: Fresh-keeping opportunity of cucumber in greenhouse early stage: Promote roots and accumulate nutrition in cucumber early stage. When many vegetable farmers raise melons, no matter how many leaves a melon has, it is unscientific to raise which one looks good. No cucumber is left under 8 leaves in the greenhouse, all young melons are removed, and nutrient accumulation and root growth are done well. In order to increase the yield, many vegetable farmers raise a melon every two leaves, but because the nutrition produced by the leaves can not meet the needs of the growth of melon strips, the growth of melon strips is slow, there are many deformed melons and the price is low. Moreover, sitting too many melons at a time will lead to excessive nutrient consumption, weak plant growth, reduced yield and even "tired" dead plants.
It is suggested to leave a melon every 3-4 leaves, and the overall yield of the plant is the highest. Because the nutrients produced by leaves can meet the needs of the growth of melon strips and the normal growth of plants. From planting to leaving the garden, each tree can produce 10 commercial melons on average, with the highest comprehensive yield. On the basis of raising melons with leaves, there is another point that needs special attention, that is, vines should not hang too low. Practice has proved that the yield of a cucumber is relatively high, and it needs 16-20 functional leaves. This requires that the height of cucumber should be kept above 1.6 meters after vine removal. If the tendrils hang too low and the functional leaves and photosynthetic products are insufficient, the growth of melon strips will not be guaranteed. The general planting time of cucumber is 1 from the end of the year to the beginning of February,1-March, and the seedling pulling time is from June to July, with an interval of 5 months. First of all, in terms of temperature, it is a process of gradually increasing temperature, which is a point suitable for cucumber physiological cycle. The seedling temperature is relatively low, so it is necessary to exercise cucumber seedlings at low temperature to promote root recession and cultivate strong plants and roots.
With the growth of cucumber, the light time and intensity gradually increased, which was beneficial to the photosynthesis, the accumulation of photosynthetic products and the growth of melon strips. We should pay attention to the balance between vegetative growth and reproductive growth. The performance of malnutrition is that cucumber will consume a lot of nutrients during its growth, which will lead to plant malnutrition. Mainly manifested in: leaves and stems, when several mature melons grow on the plant, after 1~2 months, the leaves will become smaller and smaller, some plants will have yellow leaves, and the stems of the plants will become thinner and thinner. The most obvious performance is that the melon hits the top and turns its head. Whether the cucumber grows well can also be judged by the thickness and length of the stem. The internode of the plant is controlled at 10~ 12 cm, which is a relatively robust plant. Malnutrition can also be identified from the whiskers of cucumber. If the plant is vigorous, the beard is long, straight and thick, and when the cucumber plant is weak, the beard is short, thin and drooping, which are all manifestations of malnutrition.