At present, nearly 10,000 mu of watermelon are planted in the arch shed, most of which are in vine extension period, and a few are in the early blooming stage. Through inspections, the author discovered a number of problems and now proposes the following solutions for reference by melon farmers.
One of the problems: the vines do not grow and form a rigid seedling.
The emergence of this problem is related to the fact that the ground temperature is too low in the early stage and there is a direct relationship between poor root growth. In addition, the length of cultivation of the large arch sheds here is 4-5 years. There are soil salinization problems at different levels, and some are more serious. It is proved that the ground is â€œback-alkalineâ€ after watering. Then, watermelons in the sheds were planted continuously for many years. Soil-borne diseases and self-toxic substances aggravated, and the capillary roots turned brown. The leaves at the bottom were yellow, and some began to die. To solve the weak watermelon seedlings in the shed, and the vines do not grow, we should look at the nature through phenomena. The weak nature of melon seedlings is a problem with the roots and soil, blindly focusing on the leaves on the ground, spraying pesticides and foliar fertilizers. It is useless. The transfer of ground management to underground management is of great significance.
Through tests on melons, it has been proved that using Amisite for 1 bucket of water, 3 ml of naphthalene acetic acid, and 5 ml of love for more than irrigating roots for 2-3 times can well solve soil and root problems. Generally, it is 7 days. Within the water can turn watermelon from weak seedlings to strong seedlings, yellow leaves turn green leaves. The basic principle is that Ami-Silda has a role in killing almost all soil-borne diseases, and naphthalene-acetic acid and love-doping have functions of rooting, salt-resolving, fertilizer-damaging, and self-toxic substances.
The second problem: poor growth of flowers and ovary, can not sit melon.
In the early growth stage of watermelon, due to low temperature and lack of illumination and organic nutrient, flower buds are poorly differentiated. Most female flowers do not pollinate and become malformed flowers. If the stalks are slender, they will not reach the same thickness as the main vines. Because the large arch sheltered watermelon is covered with seven membranes, under the condition of good insulation, the light intensity will be seriously insufficient. In the sunny days, the four-layer membrane in the greenhouse must be peeled off to increase the illumination time and light intensity as much as possible. If the temperature is not low in rainy days, At 18Â°C, do not cover the small shed, try to increase the scattered light. In addition, proper application of boron, calcium, zinc-iron leaf fertilizer, such as yellow leaf spirit fertilizer, is conducive to the promotion of flower bud differentiation and fruit expansion, can be properly added meat hormone, spraying 2-3 times. At the same time, it is indispensable for the use of sitting guarunes, 3-4 jins of water against a seat of guayan, with a small watering can at the young melon spray, try to avoid flowers and cucurbits. Some winter shed watermelons have a long trend and have adverse effects on pollination and sitting cucumbers. In addition to using cooling seedlings to reduce watering and nitrogen fertilizer application, they should pay close attention to the commander and can spray more than one packet of water per barrel. (10 ml) or two booster (10 ml each), sprayed 1-2 times depending on the circumstances.
The third problem: timely prevention and treatment of leaf diseases.
At present, the main leaf diseases of watermelon are anthracnose, blight, black spot, brown spot, and bacterial leaf blight, which are mainly mixed. If the resolution is not clear, it is better to adopt a compound formula for comprehensive prevention and treatment. , that is, the application of Ami receives a bucket of water
1 package plus a noble copper spray 1-2 times. This prevention and control method has been fully recognized by the majority of growers after it was widely used in watermelon production areas last year.
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