How to grow Rehmannia well? Key technical points for Rehmannia cultivation
How to grow Rehmannia well? A netizen can help introduce the cultivation method. Rehmannia cultivation can refer to the following methods: 1. Rehmannia site selection and planting: choose flat terrain, convenient irrigation and drainage, deep soil layer, loose soil texture, rich in organic matter, and good water and fertilizer retention sandy loam as suitable, with a crop rotation period of ten...
How to grow Rehmannia well? A netizen can help introduce the cultivation methodRehmannia cultivation can refer to the following methods:
1. Rehmannia site selection and planting:
Choose flat terrain, convenient irrigation and drainage, deep soil layer, loose soil texture, rich in organic matter, and good water and fertilizer retention sandy loam as suitable, with a crop rotation period of ten years.
2. Rehmannia variety selection:
Beijing No. 1, Beijing No. 3, Jinjiu.
3. Land preparation:
In combination with land preparation, apply 5 square meters of fully decomposed coarse miscellaneous manure per mu, 100 kg of sulfate-type ternary compound fertilizer, deep plow 30 cm as base fertilizer, and per mu use 1.5-2 kg of 50% thiram + 0.8-1 kg of 1.8% abamectin mixed with 30-40 kg of fine sandy soil to make toxic sand and broadcast it, then plow (harrow) the soil for treatment, to control underground pests, nematodes, fusarium wilt, stem base rot and other diseases and pests.
4. Sowing of Rehmannia:
1. Soil disinfection of the Rehmannia planting site: after sowing, along the sowing belt, use a mixed solution of Nongkang 120 + Guangkuling 300 times for ground spraying to disinfect the soil, to prevent fusarium wilt, stem base rot and other diseases.
2. Suitable planting time for Rehmannia: in mid-April, use plastic film mulching to ensure full seedlings from one sowing.
3. Soaking of Rehmannia seedlings: soak in 25% Shibaike 1500× or Junkeduke 250× or OS-Shiteling 250 times solution for 30 minutes, then air-dry until sowing.
4. Weeding method for Rehmannia: soil closed chemical weeding: from late March to early April, after sowing and before emergence, use 200 ml of Shitianbu per mu, dilute with 45-50 kg of water for soil closed treatment (spray in reverse rows, and prohibit people and livestock from entering the field within one week to avoid damaging the herbicide film).
5. Field management of Rehmannia:
1. Topdressing method for Rehmannia: after seedling establishment, apply 25 kg of nitrogen-phosphorus-potassium compound fertilizer or 50 kg of cake fertilizer per mu; in the middle and late stages, when entering the tuber enlargement period, spray 0.06 kg of nitrogen-phosphorus-potassium compound fertilizer per mu on the leaves.
2. Watering method for Rehmannia: after emergence, water less and keep the soil at yellow moisture level as suitable. The principle of watering Rehmannia is three waterings and three no-waterings. The three waterings are: water during drought before emergence, water after fertilizing, and water in time when there has been a long drought without rain and the plants appear wilted at noon. The three no-waterings are: do not water when the weather is not dry, do not water when the noon air temperature and soil temperature are high, and do not water when it is cloudy or raining. After rain or watering, any accumulated water should be drained in time.
3. Bud removal method for Rehmannia: remove flower stems in time to help concentrate nutrients for rhizome growth.
6. Pest and disease control of Rehmannia:
1. Control methods for fusarium wilt and stem base rot: on the basis of chemical seed soaking and soil chemical treatment, in the early stage of disease, use a mixed solution of Nongkang 120 + Guangkuling 300 to drench the roots, with 0.2-0.3 jin of medicinal solution per plant, continuously drenching 3-4 times, with an interval of 7-10 days.
2. Control methods for leaf diseases such as ring rot and spot blight: before disease onset, choose 1000 times Guan Jun Qing or 500 times Longkejun or 500-600 times Junkeduke or 500 times OS-Shiteling solution for spray protection. After disease onset, choose 1500-2000 times 30% difenoconazole-propiconazole solution or 300 times Junkeduke or 300 times OS-Shiteling solution or 1500-2000 times Zhixinxing for alternating spray control, with an interval of 7-10 days.
3. Control method for viral disease: use 500 times Junkeduke or 500 times OS-Shiteling or 600 times Longkejun + 1500 times Dagongchen or 2000-2500 times 0.9% Chongmanke mixed spray.
4. Control method for red spider mite: choose 2000-3000 times 0.9% Chongmanke or 1500-2000 times 34% Huifeng Keman or 1500 times Weili Te for spray control.
5. Control method for cutworm: per mu use 5 kg of roasted fragrant bran mixed with 250 g of trichlorfon (dissolved in 500 g of warm water) to make poison bait, and scatter it between ridges in the evening to trap and kill; or per mu use 40-50 ml of 2.5% Kung Fu or 50 ml of 4.5% beta-cypermethrin, diluted with 35-40 kg of water, and spray on the ground in the evening for control.
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