If sowing is sown too early in suitable period, and the seedlings are prosperous before winter, it is easy to cause early infestation, and if it is too late, it is not conducive to the wintering of seedlings. The best sowing is generally in mid-September, which must not be earlier than September 1 and no later than October 5.
Proper planting in a timely manner Usually planting in appropriate period is planted in mid-November, and no later than November 25. The daily average temperature is appropriate at about 10°C. At this time, the seedling stem base is 0.5 centimeters thick, 3 to 4 true leaves, 40 to 50 days of seedling age, and 3 to 4 new roots can be grown before the soil is frozen to facilitate safe wintering.
Before field planting, it is necessary to do a good job of cultivation of strong seedlings and prevention and control of underground pests to control watering and fertilization. If the seedlings are yellow, a 0.3% urea solution may be sprayed on the leaves. Before the freezing, it is necessary to pour enough overwinter water. After returning green, it will be poured once and return to Qingshui. After the leaves have entered the vigorous growth period, 15 kg of urea will be applied per acre. Before returning green for 50 days, before the expansion of bulbs, 10 kg of urea and 15-20 kg of potassium sulfate were applied. If it is found that twitching plants, the pods can be split from the middle to promote bulb enlargement.
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