According to the comprehensive benefit of technology and economy,the lees content of 20% in the fly ash-lees compound media was the optimumproportion for planting shamrock.

• 从技术和经济的综合效益来看，在粉煤灰原酒糟复合基质中酒糟含量20%25为适宜种植三叶草的最佳配比。