Potatoes, the scientific name of Bulb Cabbage, is a kind of cabbage vegetable with bulbs for eating.
(1) Selection of improved varieties: Select kohlrabi varieties with bolting tolerance and oblate bulbs. Sambo mainly grows kohlrabi, which is used to make leeks.
(2) Timely sowing: Potatoes seedlings are generally raised in flat beds, and the suitable sowing period is from late/kloc-0 to early February. Sowing in advance is easy to lead to immature bolting, which affects the yield and quality of bulbs; Cuohou
Sowing, small seedlings, late maturity and low efficiency, so we should sow strictly on time. Water the soles of feet before sowing, and the soil layer of seedbed 8- 10 cm should be saturated. Sow 1.5g per square meter of seedbed, about 60g per mu, and dry the seeds. After sowing, cover a layer of sieved fine soil with a thickness of about 0.5 cm, which requires that the whole seedbed be covered with uniform soil thickness.
(3) cultivating strong seedlings: after the seedlings are in full bloom, cultivate the soil once with a thickness of 0.5 cm to prevent the soil surface from cracking; After the cotyledons are spread out, the seedlings should be separated by 6.7 cm, and then the soil should be cultivated again with a thickness of 0.5 cm, so as to facilitate the seedlings to take root, reduce the temperature of the seedbed and prevent the occurrence of damping-off disease. Five days before planting, all mulch can be removed and seedlings can be exercised.
(4) Planting: Generally, it is planted in late April and early May. Select a plot with fertile soil and strong water and fertility conservation, apply 5000 kg of high-quality farmyard manure and 30 kg of compound fertilizer per mu, plough deeply, rake the soil and fertilizer evenly, and ridging at the rate of 1.2 m. The plant spacing is 35 cm, and there are about 6000 seedlings per mu. It needs to bring complete clods and water them with planting.
(5) Fertilizer and water management: kohlrabi has a short growth period and is usually harvested 65-70 days after planting. After slowly planting seedlings, timely intertillage to conserve moisture, increase ground temperature and promote root development. Pay attention to squatting seedlings, and don't topdress and water them too early, otherwise it will easily cause plants to grow white and affect bulb development, which is characterized by many leaves, small bulbs and late maturity. Therefore, it is required in cultivation that when the bulb diameter reaches more than 4 cm in the middle and late stage of expansion.
Start watering, keep the soil moist, and prevent the soil from being too wet and uneven, causing bulbs to crack. At the same time, topdressing 1-2 times can promote bulb expansion, and urea or compound fertilizer 15-20 kg can be applied once per mu.
(6) Timely harvesting: the maturity of Isatis indigotica is at the turn of July and August, and the temperature is high. After the bulbs arrive, they should be harvested in time, cut into filaments and dried, and sold to the pickles factory.
(7) Pest control: The pests that harm Isatis indigotica mainly include Pieris rapae, Plutella xylostella and aphids. Attention should be paid to early control, and 5% chlorhexidine and 10% pyridaben can be selected for control. China Organic Agriculture Network