Rhubarb is a perennial deep-rooted plant suitable for a sunny environment. It is better to have deep neutral and slightly alkaline sandy loam and lime loam. The mountain climate is cool and the area with low groundwater is suitable for cultivation. For acidic soil, apply 1500-3000 kg of lime per hectare, deep-plowing 30 cm or more, and apply enough base fertilizer, 45-60 tons per hectare. After thawing in the arid areas, the soil is flattened and the seeds are soaked.
Sowing: Spring and autumn can be used. The method of spring sowing is to select the mature and full-bodied seeds of the three-year-old robust plants and plant them on the eve of the spring rain. In the whole land, the northeast will be planted in the middle and late April, the row spacing is 60-75 cm, the row spacing is 45-60 cm, and 5-10 seeds per hole, which can be mixed with the scutellaria, covering about 2 cm, and the seeding rate per hectare is 22 .5 ~ 30 kg.
In the southerly region, it is used for autumn sowing, with a plant spacing of 45 cm and a row spacing of 60 cm. It can be used for intercropping with Sanmuxiang and Angelica. Watering, fertilizing and weeding at the right time to facilitate emergence. Seed treatment before sowing, immersed in warm water of 18 ~ 20 ° C for 6 ~ 8 hours, covered with damp cloth after immersion, rushing 1 or 2 times a day, 1% ~ 2% of seeds can be sown when germinated.
Seedling: In the spring, choose the mature land or the habitat of Xiangyang for deep tillage and fineness, and make a 120 cm wide seedbed, depending on the terrain. In the north, planting in March, striping, line spacing 9 ~ 10 cm, covering soil 3 ~ 4 cm, 10 days to emerge. Pay attention to moderate watering after sowing. When the seedling height is 6~10 cm, set the seedling according to the live broadcast. The sorghum can be used in the south. The groove is 25 cm wide and the horizontal groove is 3 cm, and the depth of the groove is 3 cm. After the human excrement is applied, the seeds are evenly scattered into the ditch. Every 3 to 5 cm, there is a seed, suitable for a layer of fine soil or smoked soil, no seeds can be seen, and then cover the grass to protect the sputum. After the emergence of the seedlings, the grass is covered in the cloudy days or in the evening. After the seedlings are out, they insist on seeing the grass. Apply human and animal waste water 2 to 3 times to accelerate seedling growth. When the first weeding, the seedlings with too close spacing were transplanted, and the depth of each seedling was 30 cm, the soil was 1.5 to 2 kg, and the soil was about 6 cm higher than the head, 6 to 10 cm below the ground. Conducive to topdressing and soil.
Field management: Rhubarb grows longer and can only be harvested in three years. Therefore, it is especially important to loosen soil, weed grass, topdressing and pest control. Generally, the soil is loosened 3 times in the first and second years, and the topdressing is 2 times. At the beginning of the first June, chasing cake fertilizer or fertilizer (superphosphate 150-225 kg / ha, potassium chloride 75 ~ 112.5 kg / ha, ammonium sulfate 112.5 ~ 150 kg / ha). In the second half of August, phosphorus and potassium fertilizers were applied at a rate of 150 kg/ha per hectare. The second year of topdressing 2 to 3 times. In addition, attention should be paid to the prevention and control of pests and diseases (such as root rot).
Harvesting and processing: Rhubarb can be harvested 2-3 years after transplanting. When the stems and leaves of the ground are withered in September-October, the roots and roots are excavated, the stems and soil are removed, and the rough skin is scraped with a bowl. Top buds and fine-stem roots, large-sized ropes can be used, small and medium-sized can be sliced, dried or dried.
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