Planting and management of Arnebia euphratica

1. Climate and soil

Arnebia hardy, avoid high temperature, afraid of flooding. Calcareous soil, sandy loam and clay loam are the best soils.

two。 Land preparation

After raking and raking the land deeply, open a small ditch with a distance of 20-30cm. Manure or green manure is applied in the ditch.

3. Planting

Seedling raising method: sowing in the first ten days of April, watering the seedbed first, sowing seeds after the water seeps down, covering the soil with more than 1cm, often keeping moist, emergence in 15-22 days. When the seedling height was 6-10cm, it was transplanted to the field with row spacing 30cm and plant spacing 10-15cm, and watered after slight pressure.

Direct seeding method: sowing seeds before and after the Qingming Festival, sowing strips, opening shallow ditches according to row spacing 30cm, sowing seeds evenly, and suppressing after sowing. Seedling height 6cm about time seedling, plant distance 10-15cm.

4. Field management

Prevent high temperature and direct sunlight in seedling stage, pay attention to watering, weeding and loosening soil. Drainage should be timely in the rainy season. When the seedling height was 20-25cm, 20-25 jin of superphosphate was applied per mu, followed by covering and watering.

Soil preparation and fertilization

It is suitable to plant on loose and fertile sandy soil with high terrain and good drainage. Before sowing, apply 75000 kg of farm manure per hectare, turn it more than 30 cm deep, rake it flat and make a bed 100cm wide, ready to sow.

Reproduction method

Reproduce with seeds, divided into autumn sowing and spring sowing. From seed harvest to ground freezing in early November, autumn sowing began to germinate at the beginning of April in the second year, and the whole seedling emerged from late April to early May. Spring sowing takes place from March to early April, and seedlings emerge from late April to early May. Spring sowing seeds must be treated at low temperature to allow the embryo to mature. If the seeds are sown more dry, they will not emerge in the same year. There are two sowing methods: strip method and sowing method.

Seed treatment: from late October to early November, after mixing seeds with wet sand at 1:3, hide in the pit, dig a pit 45 cm deep and 30 cm long and 30 cm wide on the sunny slope, put a small amount of branches at the bottom of the pit, cover the seeds with a layer of leaves, and cover the seeds with 10 centimeters of soil. pay attention to rodent prevention during seed sand storage. Before and after the Qingming Festival the following year, most of the seeds have already sprouted before sowing.

Strip sowing: open a shallow trench with a depth of 3 cm according to the row spacing of 15 cm, evenly sow the seeds, cover 3 cm of soil after sowing, and sow into the suppression. The use of 22.5-30kg per hectare.

Sowing: spread the seeds evenly on the bank and cover the soil by 2cm. After sowing, make the seeds come into contact with the soil and press slightly. The sowing rate is 30 kg per hectare.

The seeds were sown in spring after treatment, and the seedlings began to emerge within about 10 days with sufficient temperature and humidity.

Field management

(1) weeding by ploughing

Loosen the soil and weed in time to prevent barren grass from bullying seedlings.

(2) replenishing and fixing seedlings

Timely check and repair seedlings in the seedling stage, if too dense can be appropriate between seedlings, found that the lack of city selection of overcast and rainy days or evening timely replenishment of seedlings, after watering, moisture conservation. When the seedling height is 10 cm, the seedling should be fixed according to the row spacing of 15 cm * 10 cm.

(3) topdressing

Topdressing 150 kg of urea per hectare after seedling setting, 225 kg of calcium phosphate per hectare after flowering, topdressing or watering on rainy days.

(4) drainage and irrigation

Arnebia is most afraid of waterlogging, pay attention to drainage in the rainy season to avoid root rot. If the drought is serious, it can be watered properly.

Pest control

(1) Root rot

Hot or rainy seasons occur. The roots rot and the stems and leaves wither on the ground.

Prevention and treatment: ① drainage in time after rain. ② cleared the diseased plants and burned them, and disinfected the acupoints with lime powder. ③ used 1% ferrous sulfate to irrigate the acupoint for disinfection.

2) Leaf spot

Damage to the leaves, irregular disease spots are formed on the leaves.

Prevention and cure method: ① pulled out the diseased plant in time. ② was prevented and treated with 100-fold Bordeaux solution.

(3) the pests of Lithospermum are grubs, mole crickets, ground tigers and weevil, which can be killed artificially or trapped with poison bait.