1. Spring radish: sow in early spring, harvest in early summer, and the growth period is generally 25-60 days. Sow in March-April and harvest in early May to June. In the northeast, northwest and northern North China with high latitude and altitude, the seeds are sown in April-May and harvested in June-July.
2. Summer radish: Sow in May-June and harvest in July-August. Sow too early, and it is easy to pluck the moss in advance. It is mainly used as a supplement in autumn.
3. Autumn radish is sown in the warm areas of North China and Northwest China from late July to early August, and harvested in1late October to1/early October; In the colder areas of northeast and northwest, sow in the first and middle days of July, and harvest in the first and middle days of 10; In the northern alpine region, it is necessary to sow in mid-June and harvest in late September to1early October.
4. Winter radish: The sowing date of winter radish should generally be selected in the first half of September. Sowing too late, due to the low temperature, will lead to insufficient growth of leaf clusters and low yield.
Radish planting method
1. Timely sowing: According to the characteristics of each variety, environmental conditions and market demand, determine the appropriate sowing date. For example, winter radish is the most suitable sowing date in the Yangtze River valley from mid-August to early September. Premature sowing not only has low yield, but also has poor quality, which affects the quality of processed products. If sowing is too late, the leaf cluster will grow small and the yield will be low. Another example is the carrot in Hangzhou, which is sown in late September to early October of 10. Early sowing is easy to be hollow, which is not conducive to extending the supply time, while late sowing will result in small plants and low production.
2. Reasonable close planting: Before sowing radish, deep ploughing and sufficient base fertilizer should be applied. When sowing, the reasonable close planting sequence should be determined according to the characteristics of seeds and the local soil, fertilizer and water conditions. Seeding, drilling and sowing can be used respectively. Large radish, such as Zhejiang Dachang, Zheluo 1, etc., are planted in holes, with row spacing of 40~50 cm and planting area of 2? 500~3? 000 plants, the sowing amount is 400-500g; Small radishes, such as small goubai and Emilia sonchifolia, are sown by sowing, and the sowing amount per mu is1000 ~ 2,000g, and the last distance of the seedlings is 15~20 days.
3. Fertilization: Radish fertilization should be based on base fertilizer, supplemented by topdressing, that is, 70% of the total fertilization is used as base fertilizer. In addition to human excrement and urine, the base fertilizer should also be applied in combination with decomposed manure containing complete nitrogen, phosphorus and potassium. For example, farmers in Hangzhou poured human excrement and urine on the border before sowing, and then spread manure on the border after sowing1000 ~15000kg. This can not only prevent heavy rain and drought, but also provide seedlings with sufficient nutrients. During the period from breaking white to bare shoulders, apply human excrement and urine twice, each time per mu 1000~ 1500 kg, and then generally stop chasing the moon to prevent excessive growth and affect the growth of dynamic roots. When topdressing, avoid excessive concentration and pouring near the roots to avoid burning the roots and rotting or hardening the fleshy roots.
4. Watering: Radish has shallow roots, few lateral roots and weak drought resistance after emergence. When it is dry, it should be watered in time to keep enough water in the soil. With the growth of the plant, the amount of water gradually increased, especially during the vigorous and hypertrophy period of fleshy roots, more attention should be paid to the side response of water. Insufficient water or uneven water supply will affect the normal growth of fleshy roots, reduce yield and quality, and are prone to cracking or hollowing. However, too much water will also cause the leaves to grow in vain and even get sick. In rainy season, attention should be paid to drainage, which is beneficial to the deep development of affected roots.