Key points for growing beans in greenhouses

The temperature is not resistant to frost. The suitable growth temperature is 18-20 ° C, and the flowering and pods are suitable. The suitable temperature is 18-25 ° C, and 0 ° C is subject to freezing damage. The cold leaves at 2-3 ° C temporarily lose green, but the temperature rises to 15 ° C Can return to normal after 2-3 days. Plants grow poorly below 10 ° C, and can easily cause flowers and pods to fall above 32 ° C. Beans require strong light, and the varieties are not sensitive to the length of sunlight. According to the above characteristics, the following points should be noticed when growing bean in winter greenhouse:

1. Selecting good varieties: Selecting good varieties is the primary condition for capturing high yields in the greenhouse and creating high benefits. Greenhouse planting should * "newly choose eight inches". "Green Dragon", these two crops have strong growth, green pods, flat long strips, high yields, and yields of 3,000 kg per mu, which are suitable for protected planting.

2. Site preparation and fertilization: Fine site preparation and deep application of base fertilizer are the basis of strong bean seedlings and high yield. Apply 2-3 square meters of fully decomposed organic fertilizer, 25-35 kg of ternary compound fertilizer or diammonium phosphate. The north-south to north-south flat rafters were made, and the rafters were 1.25-1.3 meters wide.

3． Reasonable planting density: sufficient fertilizer is applied in the greenhouse, and the plants grow more vigorously, but the light is weak, and the planting density should be thinner than in the open field. Two rows per planting, the hole spacing is 28-30 cm. 7,300 strains.

4． Scientific management: Phaseolus vulgaris is generally broadcast live, and watering should not be too much before sowing. The degree of wetness should be used to avoid lowering the ground temperature. Immediately after sowing, the soil is covered with mulch to increase ground temperature and promote early germination of kidney beans. Otherwise, it will easily cause rotten species.

After emergence, the seedlings were timely removed from under the mulch and covered with soil. At this time, the management promotes root-refining, and the shed temperature is maintained at about 15 ° C.

Before throwing the vines, try not to water, and mainly cultivating. After throwing the vines, suspend the ropes in time to prevent the vines from intertwining. In this period, the watering is still properly controlled. The principle is "water the pods but not the flowers".

After entering the flowering period, kidney beans need a lot of nutrients and water. To obtain high yield, the plants must have good nutritional status. After the tender pods are settled, 10-15 kg of urea per acre is poured in combination with pouring water * times. After that, every time you harvest the young pods, chase high-quality quick-acting fertilizers, ternary compound fertilizers or diammonium phosphate, and conditionally apply potassium dihydrogen phosphate, 15-25 kilograms per mu, or alternate with well-dried human feces and urine. get on.

5． Shed temperature management: The temperature in the greenhouse is high, the humidity is high, and the plants are strong. The leaves are often young and not resistant to the sun. For several consecutive cloudy days, the shed and the shed must be the same as usual. Otherwise, if the wind is released after sunny days, the leaves will Burns occurred. Therefore, special attention should be paid to the management of the greenhouse on rainy days in order to receive good results.

6. Pest Control:

Gray mold: Harm to the leaves, flowers and fruits of beans. Spread, gray hair layer on the diseased surface. Onset * suitable temperature of 13-21 ° C, spores of 21-23 ° C * suitable. Control method: Spray with 100-1500 times of Su Keling, Po Hein, and Nong Li Ling, remove diseased leaves and fruits at the same time, and take them out of the shed for destruction.

Rust: It mainly harms the leaves. The back of the leaves produces small yellow spots on the back of the disease, and then turns rusty brown. The bulge appears as a small pustule, and there is brown powder scattered after rupture. Control method: Initially spray with 200-300 times sulfur suspension or polysulfide suspension, and powder must be sprayed with 30-40 kg of water per bag.

Bacterial blight: The leaf infection starts to fade from the tip or edge of the leaf, or it appears as small oily spots, and then it is irregular and yellow halo appears. Control method: seed dressing with 50% dimethonone 0.3% of the amount of seed; spray 1000-2000 times 72% agricultural streptomycin sulfate or neophytemycin at the beginning of the disease, 300 times ammonia copper irrigated, Once every 7-10 days, 2 to 3 times in a row.

Tea yellow mite: Occurs on the top heart leaf of kidney bean, has a center of occurrence, and then gradually spreads. Severe leaves are oily, shiny or oil-soaked, the edges of the leaves curl downward; young fruits are reddish-brown. Control method: timely spray 2 to 200 times the solution of sweeping mite.

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