A, planting time

Generally in April can start sowing, before the frost must be able to harvest. Cabbage like high temperature and humid environment, suitable for moist soil, like sufficient light.

Second, planting method

1, environmental requirements: cabbage on the soil requirements are not strict, but like viscous and fertile soil, like high temperature and high humidity environment, it can withstand high temperatures of 35-40 degrees. The best growing temperature is 25-30 degrees. It does not tolerate frost, frost stem and leaves will die, not cold, 10 degrees below the temperature to stop growing; like the environment of high air humidity, the environment is too dry, the fiber increases, the stem is thick and old, the sense of food is reduced.

2, sowing: the seed skin of cabbage is thicker and harder, if directly sown germination will be extremely slow, affecting the planting cycle, and if it is a long period of cloudy and rainy weather, may lead to seed rot. So before sowing, soak the seeds in 50-60 warm water for 15-30 minutes, stirring during soaking to avoid scalding the seeds, then soak them in water for one day, and then put them into the greenhouse environment to germinate, rinse them once a day during germination until until a large area starts to whiten when they are ready to be sown. Can be sown or strip sown, the amount of seed per mu is about 2 kilograms, after sowing covered with a layer of fine soil, watering to maintain soil moisture.

3, field management: the growth of cabbage on the fertilizer demand, in addition to planting sufficient fertilizer, but its growth to 5cm is to be watered and fertilized, so that it grows quickly, and then often watering, keep the soil moist. In addition, after harvesting should also be fertilized in a timely manner, so that it can make its second growth, fertilizer to nitrogen-based fertilizer. In addition, although the hollow cabbage can be certain dense planting, but too dense planting, resulting in it can not receive light irradiation, may rot.

Expanded:

p>Hollow cabbage disease control

1, white casting disease: mainly harm the leaves. The spots are born on both sides of the leaf. Petri dish leaves at the beginning of the front yellowish green to yellow spots, and then gradually turn brown, the spot is larger; leaf back white elevated scar, nearly round or oval or irregular shape, sometimes fused into a larger scar, later scar rupture scattered white gown capsule. When the foliage is seriously affected, the leaves are deformed, and the leaves fall off. Stem damage, symptoms with the leaves, but the stem is swollen and deformed. Low temperature and high humidity are favorable to the epidemic of the disease.

Prevention methods: at the beginning of the disease, remove the diseased leaves, spraying 25% mefenamic acid wettable powder 800 times, or 40% ethylenic aluminum wettable powder 250-300 times, or 64% kill alum or wettable powder 500 times, once a week.

2, the wheel spot disease: mainly harmful to the leaves. At the beginning of the disease, small black spots appeared on the leaves, gradually expanding into brown round spots, slightly elevated edge, with concentric whorls. When the disease is severe, the spots are connected to each other, and the diseased leaves are yellow. High humidity, depressed cultivation fields are susceptible to disease.

Prevention and control methods: spray 50% carbendazim wettable powder 800 times, or 50% thiophanate-methyl wettable powder 500 times, or 77% kojic acid wettable powder 500 times, for prevention and control of the early onset of the disease, and protect the cultivation of 45% Chlorothalonil fumigant, 200 grams per mu each time.

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