The use of shade nets to cover cultivation of tomatoes in summer can provide environmental conditions that are more conducive to their growth, and can increase their yield and quality, effectively alleviate the shortage of tomatoes in the summer, and have great market potential and high benefits. Its cultivation techniques are as follows:
I. Selection of improved species
In the summer, when the temperature is high and it is rainy, the viral disease and bud blight on tomatoes can easily occur. Selecting the varieties with strong resistance to disease is the key to cultivate tomatoes in summer. Such as hair powder 802, Niagara 868, Selster, New Lunfeng hybrid 2 and so on.
Second, seedlings
The suitable sowing date for summer tomatoes is in late June. About 30 days at the seedling stage, the plants have 5 to 6 true leaves and they are transplanted and planted.
Third, the land cover network
1. Soil preparation. Choose a well-ventilated, well-drained and irrigate condition, thick soil layer of idle winter warm greenhouse cultivation, per acre Shi Mangan 5,000 kg of organic fertilizer, potassium sulfate compound fertilizer 60 kg, spread evenly, deep plowing soil preparation to do.畦 1.2 meters wide, 畦 surface must correspond with the sling, in order to prepare for vines; or insert triangular, quadrangular frame vine.
2. Shade net fixed coverage. Shade nets will be directly covered on the scaffolding, and both sides of the net are 1.5-1.7 meters away from the ground. At noon to cover the light to avoid high temperatures, the effect of morning and evening exposure to low light, the lower part is also more ventilation, which will help the normal growth of plants and nutrient accumulation. Sunshade nets should be covered during the day in the sunny days and exposed at night.
3. Lightly move and lightly plant. 3 to 5 days before transplanting, watering, planting with soil, avoid cutting branches when transplanting, to prevent virus infection. Each row is planted with 2 rows, 60 cm big row, 40 cm small rows, 30 cm plant spacing, 1 water per plant after planting, and 1 second water after 2 days. After transplanting, spray 80% of Dasheng M-45 WP 600 times or 60% downy mild WP 300 times or 20% of virus A WP 300 times, plus 20% of locust 3000 times , spraying once every 10 days, even spraying 2 times, can prevent early blight, late blight, virus disease, maggots and L. sativae.
Fourth, field management
1. Keep flowers. When 2 to 3 florets are open, they are sprayed with 25 to 30 mg/kg of rhizomatis on the backside of the inflorescence to prevent falling and fruiting at 9 to 10 am, spraying once every 3 days.
2. Scientific pollination. Use growth hormone deuterium treatment to increase fruit setting rate. Use 10 to 20 mg/kg of 2,4-D, with a little red pigment. At 8 to 9 in the morning, use a brush to sip the stalk of the newly opened flower. Do not spray drops on the stems and leaves, let alone spray, to prevent phytotoxicity. To strictly control the concentration, the concentration is too high, or repeated flowering, will produce abnormal fruit.
Natural Aesculetin,Cas 531-75-9,Aesculetin Extract ,Aesculetin Extract Powder
Shaanxi The River Pharmaceutical Co., Ltd. , https://www.dahepharma.com