How to grow broccoli?
Seeding rate Broccoli seeds are small, the cost of seed production is high, and the selling price is also high. In order to save costs and ensure that there are enough seedlings for field production without wasting seeds, the seeding rate should be calculated scientifically. The calculation method for the amount of seeds is as follows: the seed amount (g/mu) = [(the number of seedlings per acre + the number of seedlings per acre) (1000 seeds per 1000 seeds)] germination rate. The qualified seed germination rate is more than 85%, and the safety factor for raising seedlings can be estimated as 80%. The seed weight of broccoli seeds is generally about 4 grams, depending on the variety. When planting can be calculated according to the specifications.
Sowing density The sowing density refers to the seeding rate per unit area of ​​the seedbed, which is commonly expressed in gram square meters. Sowing density directly affects the quality of seedlings. If sowing is too dense, the seedlings often crowd each other at the time of emergence or emergence, and have poor ventilation and light transmission, which can easily lead to leggy and easily induce disease. However, if the seeding is too sparse, the seedbed utilization rate is too low, resulting in waste. The appropriate sowing density is when the seedlings have enough room for growth when they are transplanted or colonized, and they are not crowded with each other. The seeding rate per square meter seedbed is generally 5 to 10 grams, or 2 to 3 seeds are generally sown per cup.
Seeding depth Before sowing, the nutritious soil should be crushed and smoothed, and then watered and then sown. After sowing, cover about 0.5 cm thick soft humus to cover the seeds. If the cover soil is too thick, the seed is difficult to unearth, and it is easy to form high-weak seedlings or rotten seed; if the cover soil is too thin, the seed radicles are exposed, and they are prone to lodging or water loss.
In order to keep wet and avoid scouring the seeds when spraying, cover the soil with gauze or straw, then apply enough water, and cover with plastic film for winter and spring sowing.
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By setting a protective collar, the neck of the operator can be kept warm and protected. The provision of a hand guard is helpful for the surgical staff to temporarily place their hands in the hand guard while waiting during the operation, which plays a protective role and is more in line with the principles of aseptic operation and occupational protection.
By setting the shrinking cuffs, it is beneficial to make the cuffs fit the wrists, prevent the cuffs from loosening, and prevent the gloves from slipping off during the operation and the operator's hands are exposed to the gloves.
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