Control of fertilizer-based, prevention of melon watermelon

The current single-film greenhouse watermelon East about to enter the pollination period. Vegetable Research Institute in Dongtai Chan Po Kuan, a telephone interview, the combined production of melon watermelon summed up the reasons, to provide technical guidance for the watermelon production.

According to reports, the main melon and watermelon aspects of factors.

First, vegetative and reproductive growth of non-conforming. As the entire vine is unreasonable, "promoting" and "control" lack of balance between vigorous vegetative growth to reproductive growth can not normally turn affect fruit set.

Second, fertilizer inputs unreasonable. Excessive fertilizer application, especially in field with excessive chemical fertilizer, resulting in excessive growth of plants, a result of reduced resistance to melon.

Third, poor pollination. Protected cultivation affected by short day at low temperature, resulting in watermelons first opened female flower parts, less use of male flowers; stigma too wet sticky powder, leading to poor pollination, poor fruit development, are easily lead of melon.

Fourth, hormone misuse. Some Watermelon fruit set in the spirit of such spraying when the concentration of too much hormone, resulting in deformed fruit and more, although some can be enlarged melon, but later more serious cracking.

Production from the following aspects, to reduce rotting.

- Is the fertilizer and water management. Fertilization, not partial nitrogen, organic manure, P and K, mu basal 1000-2000 kg of decomposed manure, composting can be added to 150-200 kg of cottonseed cake or rapeseed, who turned the bottom; upper phosphate fertilizer too Calcium 30-40 kg, 50 kg of 45% potassium sulfate compound fertilizer (do not use potassium chloride). In the second female flowers after pollination, Yougua started to enlarge when the 15-20 kg of urea per mu, 10 kg of potassium sulfate. Yougua enlargement of the event continued dry weather, pay attention to proper watering hose or drip irrigation under film drought. After picking the first melon, inside a large scaffold leftover film as the next Zaishi 15 kg of urea fertilizer Relay to promote the second and third batch of melon growth.

Second, spread the whole time. Vine after vine stretch the whole time, Yaman, increase light transmittance. The current production of Main's Beijing Xin 2, good morning (8424) and other species to "a primary two" three-vine type pruning, control of vegetative growth. To prevent the top edge is too strong, can hand Qingnie main vine to the top, so that injuries of the water, reduce fertilizer and water to the top conveying concentrated nutrient supply Yougua.

Third, melon vine hanging. The second female flowers usually remain main vine of watermelon melon melon as a commodity, if the vegetative growth, excessive control can be used to stay melon root length, when Guaman normal vegetative growth removed gengwa.

Fourth, attention to ventilation and pollination. To maintain vegetative growth stage Watermelon Day temperature 26-28 ℃, flowering period of 30-32 ℃; fruit development and maturation minimum temperature of 20 ℃, the maximum does not exceed 35 ℃. Temperature is above 35 ℃ shed pollen viability of the affected film opened in time to dress ventilation to reduce Peng Wen, also with wind pollination. Artificial pollination should in 8:00 to 10:30, when the temperature 25-30 ℃. Pollination should be uniform, while marking in order to avoid leakage granted.

Fifth, do pest control work. In case of Fusarium wilt early fruiting, in a timely manner with 40% Flusilazole EC 20 ml plus 50% carbendazim WP 400 Kejia root pouring water, 160 kg, 250 ml per plant. Watermelon fruit bearing even during the rain event, mu with 45% or 15% Chlorothalonil Smoke Smoke 250 g procymidone fumigation, control Sclerotinia, Botrytis cinerea; with 75% WP Chlorothalonil (800 dilution) plus 70 ~ 4, thiophanate-methyl WP (800 times) spraying to combat the disease, anthrax. Found that aphids and whitefly, use 70% imidacloprid WP (5000 dilution) plus 0.5% Avermectin EC (1000 times) Pensha.