How to cultivate green beans in a greenhouse? Detailed explanation of the key technical points
It mainly harms the leaves, and in severe cases also harms the petioles and pods. In the early stage of the disease, small pale yellow spots appear on the back of the leaves, later turning rusty brown, raised in the form of small pustules, and then expanding into uredinia; after the epidermis ruptures, reddish-brown powder is released. These are the urediniospores.
Raising seedlings Green beans can be raised as seedlings for transplanting in small plastic bags or paper pots, sowing 2-3 seeds per hole, watering thoroughly, paying attention to heat preservation and controlling excessive vegetative growth. The seedling age is generally 20-25 days. Seedlings are generally raised around the winter solstice. When raising seedlings, quickly dip the carefully selected seeds in hot water at 80°C-90°C, then immediately add cold water to cool them down, keeping the water temperature at 25°C-30°C for 4 hours, remove them and let them dry slightly before sowing. Land preparation, fertilization and bed preparation Green beans like soil with a deep plow layer, so before sowing the soil should be deeply plowed 25 cm. Along with plowing, apply 8000 kg of farmyard manure per mu, 50 kg of superphosphate or 50 kg of diammonium phosphate, and 25 kg of potassium fertilizer. Make beds 1.2 m wide, transplant two rows of green beans per bed, with a hole spacing of 20 cm, transplanting 2 plants per hole, and 5000-5500 clumps per mu.
Early management Trellising, pinching, and removing branches. After the climbing green beans begin to vine, set up the trellis; remove all branches below the first flower cluster; pinch the main vine when it reaches the top of the trellis, and pinch the side branches in the later stage after they set pods. Pinching the main vine promotes the growth of side branches, while removing branches and pinching the side branches promotes the growth of green beans.
Pod-setting stage management Control first, then promote. From transplanting to before flowering, green beans should mainly be managed by controlling water and promoting root growth through cultivation, carrying out appropriate seedling hardening to promote flowering and pod setting; after pods are set, fully supply fertilizer and water to promote flowering and increase pod setting.