1. Rehmannia planting technology
1. Environmental requirements
Rehmannia is a high-gloss plant that should not be placed close to the edge of the forest or intercropped with tall stalk crops. The whole growing season needs ample sunshine, and the sex is dry, afraid of water accumulation and cold resistance. Otherwise the disease is serious. Rehmannia has "three fears", that is, fear of drought, fear of paralysis and fear of pests and diseases. When the soil temperature is 11 ~ 13 ° C, the emergence of seedlings should be 30 ~ 45 days, 25 ~ 28 ° C is most suitable for germination, if the soil moisture is suitable in this temperature range, germination one week after planting, unearthed 15 to 20 days, the rhizome can not be low Sprouting at 8C.
2, soil requirements
The growth of Rehmannia glutinosa has unique needs for soil and fertilizer. It is advisable to choose sandy loam with deep soil, loose and fertile soil and good drainage. The pH is neutral or slightly alkaline, and the plot with higher organic content is the best. Soil stickiness, hoarding water, and hidden plots cannot be cultivated. Special attention is paid to the fact that the rehmannia should not be repeated, which is also a key measure that should be noted in the selection of land. For the cultivation of Rehmannia glutinosa, it is advisable to select grass crops for the previous crops. It is not advisable to choose land that has been planted with cotton, sesame, beans, melons, etc., for controlling underground pests. Combine with the soil preparation, apply 2000 kg of composted compost, 25 kg of superphosphate, 50 kg of compound fertilizer, and plow for more than 25 cm. Then, leveling and finening, generally 1.3 to 2 meters wide, and can be used at the same time. 50% Fumei double 1.5 ~ 2 kg + 1.8% avermectin 0.8 ~ 1 kg mixed 30 ~ 40 kg fine sand soil poisoning sand spread tillage (耙), nematodes, blight, stem rot and other pests.
3. Water demand
In the early stages of the growth of Rehmannia glutinosa, soil moisture requirements are low, about 10-20%. In the middle and late growth stages, it is also the period of root enlargement. The soil should be kept moist, but not water. Because of its small root system, poor water absorption capacity, it is easy to wither when it is slightly dry; if the soil moisture is too much, the fleshy rhizome is perishable, so it should be properly irrigated.
4, seedling planting
(1), nursery. Generally, cultivated rehmannia has roots as a propagation material, and production is called "planting." The "plant" of Rehmannia glutinosa is generally selected from the "inverted planting" and "planting" cultivated from July to August of the previous year. This is because when the "inverted planting" and "planting" are used for seeding, the yield of the rehmannia glutinosa is high, the quality is good, and Prevent species degradation. Specific methods: From July to August, in the fine-grained yellow land planted in the spring of that year, the roots with strong growth and no pests were selected, and the short knots were folded into 4 to 5 cm. After drying slightly, the row spacing was 15-20 cm. About 10 cm, planted in a field full of foot fertilizer, appropriate weeding, topdressing, pay attention to drainage after the rain, in the second year of spring, it was planted and excavated.
(2), planting. Every acre needs to be “planted†40 to 60 kg. When the average temperature of the day is 18 to 21C, 40 to 60 kilograms per acre is required to be planted. When planting, the holes are 15 to 20 cm in length and 15 to 18 cm in length. ~ 2 sections of soil cover 3 ~ 4 cm, after compacting the topsoil, watering, and then covering the film (the film can improve the ground temperature, while having a sputum effect), planting Rehmannia is usually the best.
Second, the precautions for planting yellow
Make sure the seedlings are full 0.71776. During excavation, a 35 cm deep groove is opened at the end of the crucible, and the organic rehmannia is processed into a mature land using a special oven to form a commodity. Organic yellow leaves, flowers and rhizomes can be used as medicine. Rehmannia leaves in the late growth stage of Rehmannia glutinosa, choose robust, disease-free plants, pick up some leaves properly, and dry in the shade. Organic rehmannia leaves treats sore sores and hands and feet, and has the effect of quenching thirst and treating kidney deficiency and low back pain. Therefore, harvesting should be carried out at an appropriate time. The harvest of organic yellow flowers should be selected in the flowering period, and the flowers and flower buds should be picked back in combination with the buds. Carefully pick the roots and dry them in the shade.
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