First, extension of vines management At present, the open watermelon to extend the vine, during which the growth of stems and leaves to speed up, internode elongation, leaf area gradually expanded, and pregnant bud blossom, this stage after 18 to 20 days. Watermelon from the group to the beginning of male flowers, should be promoted mainly to accelerate the growth of stems and leaves, lay the material basis for the development of flower organs, especially early maturing varieties, should pay more attention to raise seedlings and promote pupa. In the production, diammonium phosphate or cooked cake fat can be concentrated and watered in time to promote hair growth. In this period, we must do a good job of pressure vines, pruning work. Generally, when the main vine is 40 to 50 cm long, the first knife is pressed, the second knife is pressed at about 100 cm, and the third knife is pressed at 150 cm. There are pressure and dark pressure in the pressure. The pressure is to press the guava with clods, branches and other objects on the ground. The dark pressure is to dig a deep trough in the ground and put the guava in it, leaving only the leaves exposed. Then compacted with soil. The dry slopes in the mountainous areas should be darkly pressed, and the areas with large rainfall should be fine pressure. It is best to use triple vine pruning, that is, to leave one main vine and two robust lateral vines from the base of the root, and all the other side branches are cut off. The main vine is left between 10 and 18 knots, and the pruning can be stopped after sitting on the guava. In order to control the growth of stems and leaves, prevent running lice, and promote the development of female flowers, from the beginning of the male flower of the watermelon to the flowering of the second female flower of the main vine, the growth of the vegetative bodies such as stems and leaves should be controlled, and the development of female reproductive organs such as female flowers should be promoted. Controlled integration. Production should be strictly controlled watering, and through pruning, pressure vines and other technical measures to control the growth of stems and leaves, reduce nutrient consumption, to avoid madness caused by falling, falling buds, in order to improve the watermelon sitting rate. Second, the melon period management watermelon extends after 18 to 20 days into the melon period. The melon period, also known as the melon period, is an important stage of watermelon cultivation. At this time, the contradiction between the long beak and the melon is very prominent. If too much precipitation at this time, watering is too large, and nitrogen fertilizer is applied excessively, it is easy to cause the plants to grow crazy and lead to a large number of falling flowers and falling fruit. Therefore, the management of early melons should be centered on the promotion of melons, strict control of irrigation, timely pruning, snoring and pressure vines, and artificially assisted pollination or hormone treatment measures to promote melons and improve the rate of melons. The fruit size of the melon fruit increased rapidly during the middle period, and the demand for water and nutrients was the largest. If the supply of fertilizer and water is insufficient at this time, not only the fruit can not fully inflate, but it is also prone to premature aging and dehydration. Specific management and technical measures: 1. Fertilizer management. After the young melons are seated, when they grow to the size of the eggs, Mushi (combined with irrigation and irrigation) 20 kg compound fertilizer is used to promote melon enlargement. After the fruit is set, 0.2% potassium dihydrogen phosphate can be used to top-dress l to 2 times. During the late growth period, it is advisable to maintain the relative humidity at 60% to 70%. In the extension period, two waters can be filled. Moderate amount of water can be. Flowering fruiting period does not water, in order to prevent leggy and promote sitting melon, young melons grow to the size of the egg into the expansion of the melon period, can be 3 to 4 days pouring 1 water, promote the expansion of the young melon. 2. Thinning of fruit improves the commercial quality of the fruit. When the normally grown young fruit grows to the size of the egg, a manual sparse melon work is performed to ensure the quality of the future melon. Sparse disease fruit, fruit cracking, malformed fruit, and excessive young fruit were discarded. Among the medium-fruit type, one was left with one melon, and one small-fruit type was left with two melons. 3. Artificially assisted pollination. At 6 to 7 in the morning, roll over the male petals in the field to reveal the stamens that are loosely powdered. Apply lightly on the stigma of the female flowers to make the stigmas evenly adhere to the pollen. A male flower can grant 1 to 3 female flowers. Pollination time should be finished before 10 o'clock in the morning. If the stigma and pollen age for too long, the rate of sitting is not high. After pollination, wear rainproof paper caps for female flowers. 4. Pest control. During the expansion period, vine leaves are lush, air circulation is poor, and locusts are severe. Attention must be paid to strict drug control. The main diseases are anthrax, blight, powdery mildew, etc. and should be treated as soon as possible.
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