Detailed Explanation of Key Field Management Points for Fritillaria thunbergii Planting

From planting to emergence, Fritillaria thunbergii requires the soil to remain consistently moist. During the growing period, water demand is not high, but during the vigorous growth stage of the plant (early February to early April), water demand is correspondingly greater. If water is lacking at this time, stem and leaf growth will be poor, directly affecting the expansion of the bulbs. From emergence to the bud stage, if prolonged drought occurs, irrigation is needed to combat it. During the summer survival and seed preservation period, accumulated water should be drained promptly after rain, because high temperature and high humidity can easily cause bulb rot.

Hoeing and Weeding:

Cultivation and weeding should be carried out as early as possible, preferably before the Fritillaria thunbergii emerges and during the early stage of plant growth. Generally, a shallow hoeing is done half a month after planting, and thereafter once every half month until the winter fertilizer is applied. In mid-to-late February of the following year, after the seedlings have all emerged, an appropriate deep hoeing should be done once, taking care not to damage the stems. After the stems have bolted, pull out any weeds on sight.

Topdressing:

The growth cycle of Fritillaria thunbergii is relatively short, so the main focus should be on applying sufficient base fertilizer, with topdressing applied 2 to 3 times as needed. The first application is when the seedlings are uniform: splash-apply 1000-1500 kg of human and livestock manure per mu, or 7.5-10 kg of urea; the second application is at the bud stage, with the same amount as the first. If conditions permit, after flower removal, a third "flower fertilizer" can be applied, with 1500-2000 kg of human excrement and urine per mu or 10-15 kg of ammonium sulfate, which can delay plant withering. In the main production areas, around the "Winter Solstice," a heavy application of winter fertilizer is made, using 750-1000 kg of human excrement and urine per mu, plus 75-100 kg of cake fertilizer, covered with a thin layer of soil, and then 1500-2500 kg of barnyard manure or garbage compost spread on top. The fertilizer covering the bed surface not only raises soil temperature but also improves the soil.

Flower Removal and Topping:

To concentrate nutrients in the bulbs, flowers must be removed and the tops pinched back at the right time, controlling above-ground growth and avoiding the consumption of large amounts of nutrients through flowering and fruiting. The key to flower removal and topping is to grasp the right timing; it should not be too early or too late. When 1-2 flowers have opened at the top of the plant, they should be removed. Flower removal should be done on a sunny day after the dew has dried, picking off the flower buds and stem tips, so that rainwater does not seep into the wounds and cause rot. The removed flower buds can be slightly sun-dried and then used as medicine.