Greenhouse Watermelon Secondary Squash Technique

The varieties cultivated in greenhouses are mostly early-maturing varieties, which creates time conditions for the watermelons to recolonize. According to the test, when picking up the watermelon after harvesting, it can grow new vines 7-10 days after cutting off the old vines, harvest the second pods on 40-45 days, and produce 1500 kilograms per 667 square meters. The benefit is considerable. The technique is: 1. After cultivating new vines, collect the head vines 30 to 35 centimeters from the roots, cut the old vines, use the latent buds of the base leaves to germinate, or leave 1-2 seeds at the base of the old vines. Robust new vines, the rest cut off. In this way, the position of the melons is low and the vines grow rapidly and vigorously. The watermelon has a fast maturation, a large melon, and a high yield. It is 500-600 kg more per 667 square meters than other methods. 2. High-yield measures (1) Protect the root system. In the process of management of fertilizer, watering, and weeding of the head melons, carefully and carefully protect the root system so that the root system will not be injured and grow normally and robustly. (2) fertilizer and water management. The head gourd is applied with a fast-acting nitrogen fertilizer on the 3rd day before harvest, generally 15-20 grams of urea per plant. The watermelons are watered promptly after harvest to promote the growth of new vines, expand the leaf area, and create conditions for the melons. When the plant has 80% fruit set, apply fertilizer again. General application of potassium sulfate 10 kg, potassium dihydrogen phosphate 10 kg, 5 kg of urea or organic decomposition 500 kg full, 20 kg of compound fertilizer. (3) Clearing the garden to prevent disease. Before harvesting, the head pods should be cleared of field weeds, rotten melons, diseased plants, residual leaves and leftover small melons in a timely manner, and spray 2-3 times of 500 times carbendazim or 600 times chlorothalonil and 0.2% urea. To prevent and treat diseases. The old melons that are cut off must be transported out of the field in time and the melon fields should be cleaned up. (4) Fresh pruning. Generally use a method to leave a melon, because the plant to cut the old vine, the new mango strong, fast, the result is more. In order not to affect the normal growth of the selected melons, the rapid expansion of the two melons and the early maturation of the vines and the vines and small fruits after cutting the vines are all cut off, so that the nutrients are supplied in a concentrated manner.

Marine Valve Parts


The valve stem is an important part of the valve. It is used to drive, connect the actuating mechanism or handle, and directly drive the spool to move or rotate, so as to realize the function of valve switch or regulation.Valve stem in the valve opening and closing process is not only moving parts, stress components, but also seals. At the same time, it is subjected to the impact and corrosion of the medium, and it also causes friction with the packing. Therefore, in selecting the stem material, it must be guaranteed that it has sufficient strength at the prescribed temperature, good impact toughness, scratch resistance, corrosion resistance. The valve stem is a vulnerable part, and the mechanical performance and heat treatment performance of the material should be paid attention to when selecting.The valve stem in the valve opening and closing process, under tension, compression and torsion force, and direct contact with the media, as well as the relative motion between the friction and filler, so in the choice of stem material, must ensure that it provides adequate temperature strength, good impact toughness, abrasion resistance and corrosion resistance of.


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