Cultivation Points for Growing Five Crops of Carrots a Year

I. Choosing Varieties

For carrots sown in spring and summer, choose varieties that are crisp, sweet and tender, and good in palatability; for carrots sown in autumn, choose varieties with high yield.

?II. Cultivation Points

The first crop is grown in a greenhouse, sown in early February and marketed in early April, with a growing period of about 40 days, yielding 2000-2500 kg of carrots per mu; the second crop is grown in the open field, sown in early April, with a growing period of 40 days, yielding 2500-3000 kg of carrots per mu; the third crop is sown in late June, with a growing period of about 35 days, yielding 2000-3000 kg of carrots per mu; the fourth crop is sown in early August, with a growing period of 30-35 days, yielding 2500-3000 kg of carrots per mu; the fifth crop is sown in mid-September, with part of it marketed in early winter and the rest marketed around the Spring Festival, yielding 4500 kg of carrots per mu. The first 4 crops are drilled in rows 25 cm apart with plants 15-20 cm apart, about 15,000 hills per mu, and each crop must be established at the three-leaf stage of the seedlings.

?III. Fertilization Points

Carrots have a short growth period and a high fertilizer requirement. Generally, 3000 kg of livestock manure, 50 kg of superphosphate and 20 kg of urea are applied per mu as base fertilizer, and 50 kg of ammonium bicarbonate is applied per mu as a top dressing at the large-leaf stage. In case of drought, irrigation with fertilizer water should be used; otherwise, the carrot surface will be uneven and pithy heart will occur, affecting quality and yield.