Fangfeng cultivation technique

1. Land selection and land preparation

Fangfeng is a deep-rooted plant with a main root length of up to 50 cents and 60 centimeters, which should be planted in sandy loam with high dryness and good drainage. Fangfeng is very short, bifurcated and poor in quality. When preparing the soil, we need to apply sufficient basic fertilizer, using barnyard manure 3000-4000 kg per mu and 15-20 kg calcium superphosphate per mu, ploughing fine rakes. The north is made into a flat bed with a width of 1.3mi 1.7 meters.

two。 Seed propagation is the main mode of reproduction, and root propagation can also be carried out.

The main results are as follows: (1) seed propagation can be sown in spring and autumn. Spring sowing in the Yangtze River Basin from late March to mid-April, North China in the first and middle April, autumn sowing in the Yangtze River Basin from September to October, North China sowing before ground freezing and emergence in the following spring. Spring sowing requires soaking the seeds in warm water for 1 day to fully absorb water to facilitate germination. In the finished border, the furrow spacing is 25 cm × 8 cm, the ditch depth is 2 cm, and the soil is buried 2 cm. The seeds are evenly sowed in the ditch, covered with soil, slightly suppressed, covered with grass and watered to keep the soil moist. Seedlings can emerge 20-25 days after sowing. Use 2 kg of seeds per mu.

(2) split root propagation in harvest or early spring, cut the root strips with a diameter of more than 0.7 cm into small segments 3 cm long for seed. The plant was planted according to the row spacing of 15 cm × 35 cm and the hole depth of 4 mi 5 cm. One root segment of each hole was inserted into the plant. After planting, the soil was covered with 3 mi 5 cm, and the reported amount was about 50 kg per mu.

3. Field management

(l) when the seedling height is 5 cm, the seedling spacing is 7 cm; when the seedling height is 10 mi 13 cm, the seedling spacing is 13 cm.

(2) weeding and soil cultivation should be carried out many times before June to keep the field clean. When the plant is closed, remove the old leaves first, then cultivate the soil to prevent lodging; when it comes to winter, combine with cleaning the site, and cultivate the soil again to facilitate the root to survive the winter.

(3) topdressing should be applied once each year in early June or late August, and ditched with human feces and urine, calcium superphosphate or compost.

(4) plants that have been bolting for more than 2 years should be bolted in time, except for those used to keep seeds.

(5) during the period from sowing or planting to before emergence, drainage and irrigation should keep the soil moist. Strong wind and drought resistance, do not need watering, rainy season pay attention to timely drainage, in order to prevent stagnant water rotting roots.

4. Pest control

(1) powdery mildew is harmful to leaves in summer and autumn. Prevention and treatment methods: ① application of phosphorus and potassium fertilizer, pay attention to ventilation and light transmission; when the onset of ②, 50% topiramate 800Mel 1000 times liquid spray prevention and treatment.

(2) the yellow-winged fennel borer occurs when it blossoms, causing damage to the buds and fruits. Control method: spray 90% trichlorfon 800x liquid or BT emulsion 300x solution in the morning or evening.

(3) the yellow butterfly becomes harmful in May, and the larvae bite the leaves and buds. Control method: ① artificial killing; ② sprays 90% trichlorfon 800 times solution or 80% dichlorvos EC 1000 times solution at infancy.