Watermelon, corn, lettuce, and spinach planted four-year-old

The use of watermelon, corn, lettuce, spinach four-year planting pattern, the general yield of 3,000 kg of watermelon per mu, green corn stick 500 Hall, lettuce 2000 kg, spinach 750 kg, higher economic efficiency. The cornices arranged for germination in the second half of February and planted in late March. The market began in mid-May and the harvest ended in late May and early June. Corn is broadcast live in the middle of June and harvested in mid-September. Lettuce is planted in mid-August, planted in mid-September and harvested in early November. Spinach was harvested after harvesting and was listed in batches in mid-January of the following year. Variety selection Watermelon use early-maturing, disease-resistant Jingxin No. 1 or early good (8424) varieties. Corn is selected for Su Yu (糯)1. Autumn lettuce is selected for its long-day exposure to pods and heat-tolerant varieties, such as sharpleaf whites and special heat-resistant whiteskins. Spinach selection is not easy to confuse local round leaf spinach varieties. Cultivation points (1) watermelon. Small sheds are used to raise seedlings in greenhouses, and grass drapes are covered in small arches at night. One week before colonization, the seedlings were made. Seedlings age 30-40 days when planting. Before planting, 3,000 kg of composted organic fertilizer and 50 kg of compound fertilizer were used as base fertilizer. Plant spacing is 0.5*1.8 meters, 700 per mu. After planting cover the film, take a large shed. The plants were adjusted to leave 2 vines per plant and one vine per vine. (2) Corn. Live in the open air. Ridge width 1.8 meters, height 20 centimeters, ditch width 40 centimeters, plant spacing 30 centimeters, 4000-4500 strains per acre. (3) Lettuce. Seeds soaked in cold water for 5-7 hours before sowing, washed and placed in a refrigerator freezer for 1-2 days until most of the seeds are whitened and sown. The shade net covers the nursery. The net shading nets were removed one week before planting. The seedling age is 25 days and does not exceed 30 days. Plant spacing is 30 cm. (4) Spinach. Spread the planting in the open field and plant 5-7 kilograms per acre. After sowing, the seeds were covered with decomposed thin manure, then the straw was covered with warming and moisturizing. After the emergence, the straw was peeled off.

The advantages of Ultrasonic Cleaning Machine are:the ultrasonic cleaning effect is good and the operation is simple.The sound that people hear is an acoustic signal with a frequency of 20-20000 Hz.Sound waves with a frequency of more than 20000 Hz are called ultrasonic waves.The propagation of sound waves propagates longitudinally according to a sinusoidal curve,generating a large number of small bubbles.Ultrasonic cleaning machine one reason is that localized tensile stress occurs in the liquid and forms a negative pressure.The reduction in pressure supersaturates the gas originally dissolved in the liquid and escapes from the liquid and becomes a small bubble.Ultrasonic cleaning machine the other reason is that the strong tensile stress tears the liquid."A hollow,known as cavitation.

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