Matters needing attention and technical points for raising broccoli seedlings

1. Requirements for seedling growth environment

Broccoli likes cold environment, semi-cold production, its seed germination temperature is 3 degrees, the appropriate temperature is 20-25 degrees, the highest is 35 degrees. Flower bud differentiation is not strict with low temperature requirements, early maturing varieties only need the average temperature below 20 degrees to flower bud differentiation, but in the seedling stage can not be low temperature, otherwise it will form a floret ball, resulting in its loss of commercial value. Early and late maturing varieties have lower temperature for flower bud differentiation and should not be cultivated in high temperature season to avoid forming hairy flower balls, so sowing time is extremely important.

2. Prepare seedbed

Seedbed should choose high dry, good drainage, good permeability, rich in organic matter soil, and within two years for the cultivation of cruciferous, so as not to aggravate the degree of disease. 7-10 days before sowing, tilling the soil, and then 25 kg compound fertilizer per mu as base fertilizer, and making beds. Seedbed to undergo strict disinfection measures, you can use redomil and lesben comprehensive spraying seedbed, disinfection and sterilization and kill underground pests, in addition to avoid seedlings by weeds harm, you can spray herbicides, and watering the seedbed wet.

3. Sowing

According to the local climate, variety characteristics and cultivation purposes to choose the appropriate sowing time, generally early varieties in August sowing, medium maturity in August-September sowing, and late maturity in September-October sowing. Because broccoli seeds are relatively small, so in order to make seedlings have sufficient growth space, to do a good seeding density, generally sowing amount per mu is 12-20 grams. Sowing must be uniform, often using the method of seed dressing direct seeding, the seeds evenly spread on the seedbed, generally do not cover the soil after sowing, spray water to make the seeds and soil close contact.

4. Seedbed management

Broccoli corn technology is the most critical seedbed management, broccoli planting seedlings generally need 2-3 days, shorter time, more management requirements. During the germination period, patrol once in the morning, middle and evening to observe the germination of planting, observe the dry and wet conditions of soil and sunshine intensity, and drain water in time during the rainy season to avoid rotten seeds. During the high temperature period, it is necessary to rely on watering to regulate the ground temperature and keep it between 25-30 degrees to facilitate seed emergence. Watering is best carried out before noon and in the evening, in the period of strong light as far as possible to cover the shade net, cooling rain, to be cotyledons after unfolding to remove the shade net in time.