Technical specification for ridge and furrow cultivation of licorice covered with plastic film

1. The scope of selection. Licorice has strong adaptability and can grow in general soil, but the slightly alkaline or alkaline sandy loam with a pH value of 7.2 Murray 8.5 is the most suitable. 2. Stubble selection. Licorice belongs to Leguminosae Glycyrrhiza belongs to perennial herbs, the previous crop is better than Gramineae crops, do not choose legumes. 3. Soil preparation and fertilization. After the previous crop harvest, combined with deep ploughing and soil preparation, apply high-quality farm manure 3500 Mu 4000 kg, phosphate fertilizer 50 kg, rake fine leveling to preserve soil moisture, in preparation for planting. 4. Timely planting. In the middle and late April, in the whole plot, a trench with a depth of 15cm was opened according to the row spacing of 20cm, and the seedlings were slightly tilted upward into the ditch according to the plant spacing of 30cm in the shape of "taste". Then cover the front row of seedlings with trenched soil and rake fine, according to this three small trenches as a group, compacted with plastic film with a width of 80cm, so that it formed a "three-ridge trench" cultivation model, planting about 10,000 plants per mu. 5. Field management. After planting seedlings, it is necessary to carefully tear open the plastic film and release the seedlings in time to prevent burning the seedlings, and press the torn place of the plastic film with sandy loam soil. Artificial cultivation of licorice must keep the soil layer around the Reed head soft and make the weak buds exposed to the ground to grow into new main branches. Combined with ploughing and weeding, it was found that the underground transverse stem should be removed in time to promote the growth of main root and improve the proportion of grade grass. 6. pest control 6.1 rust. The initial stage of the disease was sprayed with 1000 times solution of 70% trimethoprim. 6.2 powdery mildew. 50% methyl topiramate can be sprayed with 100 times liquid. 6.3 Gray spot. You can use 75% chlorothalonil wettable powder 500 Murray 600 times liquid spray. 6.4 insect pests. It can be controlled by 90% trichlorfon or 40% dimethoate root irrigation. 7. Harvest. The grade grass standard can be reached after 3 years of growth, and the best excavation season is when the leaves turn yellow in autumn. The method is to first cut off the stems and leaves, remove the plastic film, dig deeply along both sides, pull it out when the rhizome is exposed to more than 40 centimeters of the ground, shake the soil, remove the Reed head, root and tail, and lateral roots, and then go on the market after being dried in different grades.