The efficient intercropping pattern of potato, sweet corn, cowpea, and broccoli developed in Nanjing and surrounding areas has avoided continuous cropping obstacles and increased returns. Each acre can produce 1,000 kilograms of potatoes, 900 kilograms of sweet corn, 1,000 kilograms of kidney beans, and 1,500 kilograms of broccoli. The total output value is 14,000 yuan per mu and the net income is 10,000 yuan.

Potatoes were selected from Dongnong 303 and Kexin No. 4 varieties, and the best selection of virus-free seed potatoes was the best choice. 20 to 30 days before sowing, the large seeded potatoes are cut into pieces, each weighing 40 to 50 grams, containing at least one bud eye, and then germinated in a scattered light chamber at 15 to 18°C ​​to lay 2 to 3 layers every 2 Turn it once in 3 days and cover it at night to prevent freezing. Each potato block has 1 to 3 1-2 cm long buds that are ventilated and cooled (the temperature is maintained at 8 to 10 °C). The seedlings are grown under scattered light, and the buds turn green and sowed. In combination with winter, 2000 kg of organic fertilizer per acre and 50 kg of 45% potassium sulfate compound fertilizer are ploughed. The 8-meter-wide greenhouse is made of 3 ridges, with a ridge width of 2 meters, a height of 15 centimeters, a ditch width of 40 centimeters, and an operation line of 60 centimeters on each side of the greenhouse. 10 cm soil temperature stable at 7 ~ 8 °C when planting, Nanjing in the greenhouse covered with film cultivation in early February sowing. After the sowing, drip tapes were laid and then covered with mulch. On both sides of the ridge, 58 cm away from the ditch, they were drilled on demand. The distance was 20 cm and the sowing depth was 8 to 10 cm. About 3,000 plants were planted per acre. After sowing, soil moisture was promptly suppressed. Harvesting ends at the end of May.

Sweet corn was selected from early-middle-maturing sweet corn variety Jingtian No. 3 or Jingtian No. 5. At the beginning of March, 128 seedling trays were used to raise seedlings in the greenhouse and 1 seed per hole was sown. After sowing, they were irrigated with water, covered with plastic film on the bed, and the mulching film was removed immediately after the seedlings were flushed. Before the transplanting, the seedlings were properly cultivated, and 3 to 4 leaf stages were planted on the both sides of the planting at 15 cm from the ditch and in the middle of the planting. The plant spacing was 20 cm, and 4000 plants were planted per acre. After the live tree, it is used to decompose and dilute the manure or use urea and potassium dihydrogen phosphate to add water to water; 8 to 10 leaf phases apply urea 8 to 10 kilograms per mu; big bell-mouth fertility fertilizer applies 15 kg of urea per acre. 20 to 24 days after the ear is spit silk, when it is dark brown, it is timely harvested and marketed. At this time, the greenhouse film is removed.

Kidney beans use heat-resistant, moisture-resistant and disease-resistant Ningjing No.3. After the harvest of sweet corn in early and mid-June, the kidney beans were planted next to the sweet corn plants with 1.5 kg per acre. 10-15 days after sowing, cowpeas were pumped before vines, and some of the upper leaves of corn stalks were removed to allow the cowpeas to see more light and to control the water to prevent the plants from becoming leggy. After the vines were drawn, they were introduced to the corn stalks. Pumping manure, initial stage of scab and stage of scab increase fertilizer and water supply, fertilize 2 to 3 times, apply 15 to 20 kg of bean compound fertilizer per mu, and spray 0.2% to 0.3% of potassium dihydrogen phosphate solution. . The main vine has 15 to 20 knots and a height of 2 meters to pick the heart and promote the formation of lateral flower buds. About 45 days after sowing (mid-August mid-August), harvesting began and harvesting was completed by mid-September.

Broccoli uses cold green, late green 99 imported broccoli varieties. In the middle and late August, 72 seedlings were used to raise seedlings in greenhouses, and shade nets were placed on the seedbeds. Seedlings were transplanted 15 days after sowing. Use avermectin and other drugs to control seedling pests. After the harvest, the pods were sowed in time. Before the planting, 2000 kg of organic fertilizer was applied per mu, and 50 kg of 45% potassium sulfate compound fertilizer was applied before planting. The pods were 2 meters wide and 30 cm wide. Planted in the middle and late September, spacing 50 cm, spacing 40 cm, planting about 3300 per acre. Late soil can be combined with fertilization. 15 to 20 days after planting, 10 kg of compound fertilizer per acre. Close to the time of bud application compound fertilizer per acre 15 to 25 kg, combined with control pests with 0.2% potassium dihydrogen phosphate solution mixed with 0.25% boric acid solution spray, a total of 2 spray. Control the amount of watering at the end of the ball, and forbid the irrigation of the flood water 1 week before harvesting. Before the onset of the cold wave, the water was covered with the outer leaves to prevent freezing damage. Harvesting began in late December and harvesting ended at the end of January of the following year.

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