Site preparation:
For the cultivation of Polygala, it is advisable to choose a sandy loam land with sunny location, high heat and high dryness, good drainage, deep and fertile soil layer, and the content of harmful heavy metals and pesticide residues does not exceed the standard. After the land is selected, soil cultivation including ploughing, suppression, and leveling should be carried out on the selected land. Apply decomposed manure or compost 4000 kg/667 square meters (insecticide and sterilization treatment), apply superphosphate 100 kg/667 square meters, potassium sulfate 25 kg/667 square meters, urea 15 kg/667 square meters when deep ploughing Apply base fertilizer. After deep ploughing, shallow ploughing, raking and leveling, and spraying with trifluralin in proportion to kill the surface grass seeds (when using trifluralin, Anfargo herbicide safener must be added, so that it will not affect the emergence), 15 days later Before sowing, (0.15 kg/667 square meters of herbicide is appropriate).
Sowing date selection:
Seeds can germinate when the temperature is 15-20°C, and the optimum temperature is 25-30°C. It should be carried out from mid to late April to mid to late October before the soil freezes. Too early or too late will affect the emergence of seedlings due to unsuitable ground temperature.
Seed Treatment:
Appropriate seed treatment can be carried out before sowing. Mix 3 grams of "Bihu" with 1 kilogram of water, spray on the surface of the seeds, mix well and pile up for 6 hours. Make the seeds fully absorb the liquid medicine, so that the germination rate of the seeds can be improved and the stress resistance of the seedlings can be increased. After emergence, the seedlings will be particularly robust and the root system will be developed; or the seeds will be dried in the sun for 7 hours, and then mixed with appropriate amount of seed coat after cooling. agent, insect repellant.
Sowing method:
Whether using wide and narrow rows for sowing or equidistant sowing, evenly sown with a special seeding columbine (the seed top soil strength is weak, the sowing should not be too deep, the sowing depth is 1-1.5 cm), the sowing columbine is equipped with a roller, so that At the same time as sowing, the soil can be flattened and compacted, and then covered with wheat bran to prevent the skin from hardening.
