The spring sowing of parsley is positive from day to day. The temperature in the early stage of growth is low, which is conducive to reproductive growth, flower bud differentiation, and convulsions and flowering. Summer sowing is caused by long days and easy convulsions, inter-regional introduction, and short-day varieties introduced into the long sunshine region. In favor of reproductive growth, it will promote convulsions and flowering, and the vegetative growth period will be shortened, the yield will be low, and the quality will be poor. The seed collection in the year will be earlier than the sowing of seed after sowing.
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