求翻译：试验为研究北柴胡和南柴胡的生物量，根据生物量的比较得出结论：两个柴胡栽培种生物量的日均增长量在各个时期不同。北柴胡、南柴胡返青后持续1个月左右开始抽茎，此阶段柴胡的地上生物量日均增长较低，抽茎后，各栽培种生物量的日增量表现不同：北柴胡地上生物量在抽茎、现蕾、初花期均保持较高的日均增长量，其中在现蕾期最高，至盛花期后增长速率放缓，并且在最后种熟期有负增长的现象，而地下生物量的日均增长量在开花期达到最大；南柴胡的地上生物量和地下生物量的最高日增量均出现在初花期是什么意思？

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Pilot study for North and South Chai Hu Chai HU of the biomass, biomass based on the comparison came to the conclusion that two Chai Hu cultivars from biomass is different in each period. North South Chai Chai Hu, Hu thunderstorm after around 1 months, the stalks, this phase of the Chai Hu biomass o

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Test study on the North and South of bupleurum bupleurum chinense biomass, based on the comparison of biomass concluded: two biomass of bupleurum chinense cultivar differs from the average daily volume during each period of growth. North bupleurum, and South bupleurum regreening Hou continued 1 mont

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