The summer vegetables we refer to here include vegetables in the late growth stage of spring sorghum vegetables, as well as vegetables that are in the summer stage during flowering. At present, the spring sorghum vegetables have entered the late growth stage, and some of the summer sorghum vegetables have entered the flowering result period. Many vegetable farmers have called to report that the vegetable sheds in the shed are severely broken.
In fact, the summer light time is too long, contrary to the growth habits of vegetables, which is the main reason for the summer vegetables to break. Such as loofah, although like high temperature, but belongs to short-day plants, such as long hours of sunshine, it will inhibit the flowering of loofah, and then there will be a phenomenon of flowering and sitting melons, breaks and breaks.
Under high temperature, how to prevent the summer vegetables from breaking? The reporter suggested starting from the following points.
First, adjust the lighting and temperature in the shed properly. Illumination is a key factor in determining the temperature in the shed, so adjusting the illumination and regulating the temperature are consistent. Generally speaking, when the temperature in the shed exceeds 35 ° C and lasts for more than 2 hours, the flower bud differentiation of the vegetables is hindered, resulting in poor flowering and fruit drop, falling flowers and fruit. At present, the temperature outside the shed sometimes exceeds 35 ° C. If the sunshade net is not covered on the shed, even if the ventilation is good, the temperature inside the shed can easily reach 40 ° C or above. Therefore, the vegetable grower can cover the shade net from 11:00 am to 3:00 pm, or use a sprayer to spray water into the shed at noon, which has better cooling effect and can improve the flowering and fruit setting rate of vegetables.
Second, rational use of growth regulators. At the seedling stage of 3-4 leaves, in order to promote the differentiation of female flowers, vegetable farmers can spray ethephon to promote female flower differentiation, but it should be noted that lower concentrations should be used when the summer temperature is high. After planting, in order to control the plant growth, it can be sprayed 500 times or more than 1500 times to regulate the vegetative growth and reproductive growth of vegetables, and improve the fruit setting rate of vegetables.
Again, pick up the melons in time. If the vines are not timely, the vines are too small, and it is easy to cause excessive growth of vegetables and difficult to sit. For the loofah in the late spring, it should be accompanied by picking melon and picking the heart in time; for the early growth period of the summer gourd, the width of the vine should be increased, each time the vine is not less than 60 cm, and the height of the plant can be kept at about 120 cm. , inhibit vegetative growth.
In addition, we must pay attention to the management of fertilizer and water in the late spring vegetables. Many vegetable farmers believe that anyway, they have entered the late growth stage, the output is reduced, the management is not so good, and the number of watering and fertilization should be reduced. In fact, this understanding is wrong. The reporter suggested: in summer, the temperature is high, and it should be watered in time. In the later stage of vegetable growth, high-nitrogen and high-potassium fertilizers can be applied with water to promote the growth of plants and fruits, and the water-soluble fertilizer lighthouse, Haolipu, Fangrun, etc. can be applied. Foliar spraying of foliar fertilizer containing trace elements such as boron and calcium, such as 600 times of borax or 350 times of 1500 times of calcium nitrate, can play a role in maintaining flowers and fruits.
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