Do you know the main points for farmers to grow vegetables and purple sunflower?

Uncle Zhang in the village planted a lot of purple-backed sunflower, which grew well and had a high yield. the boy surnamed Huang in the village also wanted to plant some, so he went to ask Uncle Zhang about his technique of growing purple-backed sunflower. Uncle Zhang said that the purple back sunflower, which is also known as Panax notoginseng, is fed by its tender stems and leaves, and its cultivation techniques are as follows.

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First, raising seedlings: because the node of sunflower is easy to grow adventitious roots, and the cuttings are easy to survive, most of them are propagated by cuttings, which can be used for cutting seedlings in spring and autumn. the sturdy and disease-free branches should be cut off to cut a section of about 6cm, cut off their 1mm leaves, and insert them in a seedling bed or nutrition bowl. cover them with old film or non-woven cloth, pay attention to shading and moisturizing, and the seedling temperature should be controlled at 20 ℃. Keep the seedbed moist and survive after about 2 weeks.

Second, soil preparation and planting: select deep, fertile and loose sandy loam for fine soil preparation, apply 3000 kg of high-quality farm manure and 25 kg of nitrogen, phosphorus and potassium compound fertilizer per mu to make a flat border 1.2m wide, open holes according to the row spacing of 30x30 cm on the border, plant the surviving cuttings into the hole, plant 1 plant in each hole, pour enough fixed planting water, and seal after the water seeps down.

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Third, field management: ploughing and weeding in time after slow seedling can promote root development, keep the border moist during the growth period, be careful not to be too dry or too wet, purple back sunflower likes temperature and heat resistance, the suitable temperature for growth is 20: 25 ℃, can not bear low temperature, can only endure low temperature of 3: 5 ℃, freeze to death in case of frost, therefore, low temperature areas should be produced in greenhouse in winter, purple back sunflower has strong growth potential and long harvest time. On the basis of sufficient base fertilizer, a small amount of topdressing should be applied many times during the harvest period, and the early detection of virus disease strains should be removed in time to reduce the spread of virus disease.

Fourth, harvest: purple back sunflower can be harvested after 20 days of planting. The standard of harvest is generally that the tender shoot is about 10 cm long. In the first harvest, 2 leaves should be left at the base, so that new shoots will continue to sprout in the axils of the leaves. The second harvest will retain 1-2 leaves at the base. Under suitable environmental conditions, it can be harvested every 10 to 15 days. The more times the harvest is, the more vigorous the branches of the plant will be. If it is not harvested in time, it can be harvested every 10 to 15 days. On the contrary, it is not conducive to its growth.

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