preparation methods are as follows: 
 planted 1. Excavated to a depth of about 15-20 cm 
 2. Exposed soil left approximately 7-10 day 
 3.The manure or compost decomposition good clothes. Mixed with soil to improve the physical conditions, the increase of soil fertility 
 4.Loosen the soil to digest is small. The planting sown in the converter. To prevent the seeds fall into the soil. It will not grow or grow hard 
 5. If an acid soil should put the lime to improve soil condition at the proper 
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