Sweet Mandarin Orange,China Honey Mandarin Orange,Nanfeng Baby Mandarin Orange Changhong Imp. & Exp. Co., Ltd. , http://www.ly-foods.com
Delayed High-yield Non-pollution Cultivation Technique in Lettuce
Lettuce is a genus of the genus Asteraceae. It is a two-year-old herbaceous plant. Its edible fleshy stalks are rich in vitamins, minerals, etc. It can be cold, fried, or pickled. It has a good flavor and is well received by consumers. Lettuce is native to the Mediterranean coast and has been cultivated in China for more than 1,000 years. The main techniques for delayed cultivation of lettuce greenhouses are described as follows: Select fine varieties using Nanjing Purple, Jinan willow bamboo shoots, Hefei duck eggs, Shanghai white bamboo shoots and other seedlings more resistant to high temperature, slow response to the sun, the middle and late maturity of fine varieties . Sowing seedlings agglutination seedlings in summer and autumn, due to hot weather, lettuce seeds sprouting difficulties, and because of the small seeds of lettuce seeds, after sowing seeds top soil is weak, so usually first germination and then sowing. There are two methods of germination: one is the use of low temperature germination. The specific method is: Soak lettuce seeds for 5~6h, wash them clean, wrap them with wet cloth bags, and place germination at 15~20°C. The second is chemical germination. Soaking seeds with GA1000ppm solution for 2~4h has a good germination effect. Appropriate period, appropriate planting General greenhouses Late cultivation of lettuce harvest period from late November to December, seedling period is about 30d, planting to harvest takes 60 ~ 70d, so the sowing period should be in mid-August, late. Each 666.7 m2 lettuce should be prepared with a 12 to 15 m2 seedbed and about 50 g seeds. After the seedbed is watered, it is spread evenly. After sowing, it covers 1 to 1.5 cm with fine soil. When nurturing strong seedlings is in the season of high rainfall and high temperature during seedling raising, in order to cultivate strong seedlings, protection measures such as rain protection and sunshading are required. When the seedlings 2 to 3 true leaves when the thinning, spacing is 5 ~ 6cm. The seedbed temperature should be controlled at 18 to 20°C during the day and 12 to 14°C at night. 20 to 30 days, when the seedlings have 5 to 6 true leaves, they can be transplanted. Soil preparation before planting combined with site preparation fertilization, per 666.7 square meters of application of good quality circulatory fertilizer 4000 ~ 5000Kg, nitrogen, phosphorus, potassium ternary compound fertilizer 50Kg, deep plowing twice, so that the soil is evenly mixed, flattening, making flat plot. The close planting of the science is due to the fact that the cultivated varieties are medium and late-maturing varieties. The degree of development of the outer leaves is large and the plants are relatively high. When planting, the row spacing is 30-40 cm and the plant spacing is 35-40 cm. 1 to 2 days before planting, the seedbed should be watered in order to raise seedlings and plant soil with soil. The depth of planting should be level with the soil and ground. The seedlings should be planted straight and planted. If the membrane is covered, the colonization holes shall be sealed with soil after colonization. After planting, watering should be done in time to ease the seedlings. After the planting, the temperature in the field is controlled and the greenhouse is delayed in the early stage of the cultivation. The outside temperature is high and is not conducive to the growth of the lettuce. Attention should be paid to the ventilation to prevent the temperature from being too high. During the growing period of lettuce, the temperature is 15~20°C during the day and 10°C at night. Later, as the outside temperature drops, small arches can be covered in the greenhouse to enhance insulation. Fertilizer management Late cultivation of lettuce sheds is delayed. Due to the high temperature and ground temperature at the time of colonization and the large amount of soil evaporation, regular watering is necessary to reduce ground temperature and prevent drought. During growth, fertilizer can be applied in divided portions, and after 15 to 20 days after planting, the topdressing can be carried out. For each 666.7 square meters, 10 kg of urea or 20 kg of ammonium sulfate is used. After the 30 days of planting, the top dressing can be performed for the second time. Phosphate-potassium compound fertilizer 10 ~ 15Kg, timely watering after top dressing. In the late stage of growth of lettuce, the roots are aged and the absorption capacity is reduced. 0.2% to 0.3% of potassium dihydrogen phosphate solution can be used for foliar fertilizer application to meet the nutritional needs of late lettuce growth. After cultivating and weeding the asparagus lettuce planting, the cultivator must be cultivated in time to loosen the soil, eliminate weeds and promote root development. Before planting ridges, cultivating 2 or 3 times, after planting ridges, cultivating is no longer carried out, but weeds are to be removed. Diseases and Insect Pests Diseases of Lettuce include lettuce downy mildew, lettuce virus disease, and lettuce gray mold. The main insect pests are aphids. Lettuce downy mildew can be sprayed with 40% triethylaluminum phosphate (ethylaluminophosphate) wettable powder 200 to 300 times, or 58% metalaxyl manganese zinc wettable powder 500 times, or 72.2% prec Aqueous agent 800 times, spray once every 7 to 10 days, even spray 2 times, the effect is excellent; lettuce virus disease can be sprayed 20% of virus A wettable powder 500 times, or antitoxic agent No. 1 water agent 300 times in the early stage of disease. Liquid, or 83 anti-agent 100 times liquid, about 10d 1 time, even spray 3 to 4 times, control effect; lettuce gray mold can be sprayed in the early onset of 70% thiophanate-methyl WP wet powder 600 to 800 times Liquid, or 50% quick-inking WP 2000 times, or 50% acetaminophen wettable powder 1500 times, sprayed every 7 to 10 days, continuous control 3 to 4 times, excellent control effect. Aphids can be used in the occurrence of aphids 21% synergistic chryazoline EC 6000 times, or 40% fenvalerate 6000 times, or 20% swore CL 2000 times, the effect is very good. Late harvest due to timely late autumn due to low temperature, lettuce is not easy to produce convulsions, according to market demand, timely receipt. However, attention should be paid to climate change to prevent freezing.