Lotus root protection cultivation techniques
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1. Plot selection: The use of protected areas for planting lotus roots should be based on fertile soil, flat landform, adequate water supply, and lighter water permeability in the construction of sheds. The quick-seepage plots can be laid 6-8 silk plastic film under the soil tillage to prevent moisture infiltration. 2. Variety selection: The suitable varieties for planting lotus root in protected areas include E Lian No. 1 and E Lian No. 3, as well as local early-maturing varieties of four early and early five seasons. 3. Fertilization for soil preparation: Basal fertilizer should be based on decomposed organic fertilizer. The dosage per acre should not be less than 3 cubic meters. Fertilizer can be applied with 15-25 kg of diammonium phosphate or 50-70 kg of superphosphate per acre. Nitrogen fertilizer and potash fertilizer can only be used as top dressings. In addition, 3.5 kg of zinc fertilizer and 1 kg of boron fertilizer need to be applied per acre, and the land should be ploughed and set aside for use. This work should be completed before the Spring Festival. 4. Construction of sheds: Cultivation of lotus roots in greenhouses will be marketed as early as possible, but the cost will be too high. The benefits will be low. It will be cheaper to use greenhouses for cultivation. The north-south direction of greenhouses is better, the length is 70-80 meters, and the width of the shed is larger. Lotus grows better. For early maturity, the width of the shed should not be narrow, generally 6-8 meters is good, and the shed should be completed before the end of February, and the shed should be warmed. 5, sowing: When the soil temperature rose above 8 °C when you can sow, mu seed amount of 200-250 kilograms is appropriate, the mother lice, sub-fungus can be species. Seedlings should be planted by size, with axillary buds facing the shed. 6, water management: irrigation after sowing, the water depth should be maintained about 15 cm, this can not only inhibit weeds, but also make the temperature rise rapidly. The water level can be increased to 20-25 cm after the emergence of leaves in early April. 7. Topdressing: Planting lotus roots to apply ammonium bicarbonate, urea and compound fertilizers containing urea are all easy to cause burning seedlings. It is necessary to topdressing nitrogenous fertilizers and apply the fertilizers to the soil and ventilate day and night for 3-4 days. After the lotus leaves emerged, they began to take root to absorb the fertilizer, and then entered the vigorous growth stage, while the lotus root stem growth period was very short. Therefore, after the emergence of leaves at the beginning of April, a large amount of fast-acting fertilizers should be applied, and 20 kg of urea and 25 kg of potassium sulfate can be used per mu. Urea should be applied, buried, potassium sulfate applied, and pay attention to ventilation. In order to prevent burning seedlings, urea can be replaced by fully cooked cake fat, chicken manure, or fertilizer diluted from the manure heap. The effect is also very good. 8. Harvesting: Small sheds covered with plastic sheds can be harvested at the end of May. The cultivation of a single greenhouse can be harvested in mid-June. Before the harvest, you can touch the hands and feet in the field to check whether it meets the listing requirements. Can be changed after the one-time harvest of other vegetables, but also can not only damage the stems and leaves without cutting, let it continue to grow and topdressing nitrogen fertilizer, harvested in August-September. 9. Rotation of dry and flooded crops: the greenhouses were covered with shade nets and planted with celery after harvesting in mid-June. Harvested from late August to early October; then garlic seedlings were planted in the late October, harvested before and after New Year's Day, and can be harvested. Increase economic efficiency and improve the micro-ecological environment of the soil and realize the sustainable use of Putian.