Planting techniques of autumn lettuce

I. Land preparation and planting

The land for planting autumn lettuce requires fertile soil, strong ability to conserve water and fertilizer, and fine farming. Combined with cultivated land, 3 square farm manure was applied per mu, 30kg compound fertilizer with high nitrogen and low phosphorus, 20kg biological fertilizer and 200kg 400g trace element were applied to the cultivated land. Then dig the hole with a pick. The distance between the acupoints (plant-row spacing) is 35-40 cm, and the mu planing hole is about 5000. When the seedlings of autumn lettuce grow to 5 or 6 true leaves, they can be planted. Try to choose cloudy or rainy days when planting, which is beneficial to slow down the seedlings quickly and improve the survival rate when transplanting, make the seedlings upright as far as possible, avoid askew, and water them in time after planting.

II. Field management

After watering the slow seedling water, when the ground is not dry, in line with the principle of once shallow and twice deep, hoe twice. It should be noted that when there are crooked seedlings in hoe, it is necessary to cultivate the soil to straighten them in time, because crooked seedlings will produce curved bamboo shoots, commonly known as "stick bamboo shoots", which will greatly reduce the commercial nature of lettuce, thus affecting the income. In case of heavy rainfall, the weather should be cleared after the rain, should be hoed in time. Lettuce likes moist soil, so it should be properly watered to keep the soil moist. The lettuce was watered about 15 days and 10 days after planting, 20 kg of lettuce Le Le and 20 kg of ammonium calcium nitrate plus 1 kg of potassium dihydrogen phosphate per mu.

III. Timely harvest

If the autumn lettuce is harvested too early, the yield and income will be affected. If the bolting is hollow in the evening, it should be harvested when the outer edge leaf is flush with the growing point before bolting.

IV. Pest control

The main diseases of autumn lettuce are downy mildew, soft rot, black rot and sclerotinia disease. In the early stage of the disease, 72.2% 1000 times of aldicarb or 70% Antaisheng was sprayed to control downy mildew for 3 times for 4 times. Spray 30% nitro humic acid copper 500 times solution or 14% complex ammonia copper water agent 300 times solution to control soft rot and black rot, twice at intervals of 7 to 10 days. Control Sclerotinia sclerotiorum by spraying 1000 times of 50% Nongliling or 1000 times of 50% prohydantoin, twice at intervals of 7 to 10 days. The pest of autumn lettuce is mainly Liriomyza huidobrensis, which can be controlled by 40% Wanling 1300 times liquid spray.