今天不想干活，决定灌水。 加拿大官网关于种人参后土地方面的问题解释：

http://www.omafra.gov.on.ca/english/crops/hort/news/hortmatt/2014/01hrt14a2.htm

Soil

Many of the soil-borne diseases of ginseng are favoured by high soil moisture. Drainage is the most important factor in preventing disease. As a result, ginseng production has only been successful on sandy to sandy loam soils, with high yields restricted to truly sandy soils. This is the reason that ginseng production is mainly located in Norfolk, Brant and Oxford counties, and small pockets of sandy soil elsewhere. Growers accustomed to clay or clay loam soil often refer to sandier areas of their farms as sandy soil, but true sands are rare outside of the traditional ginseng or tobacco growing areas. Truly sandy soils are similar to beach sand with very low organic matter. A quick test to confirm a sandy soil would be to saturate a small amount of soil and try to form a ball with it. A ball of sandy soil should fall apart easily and none of the particles should stick together.

Furthermore, ginseng cannot be grown on the same land twice due to replant disease. Replant disease is a poorly understood issue that prevents ginseng cultivation on the same land even 40 or 50 years later because of significant soil-borne diseases in the second crop. This has resulted in a shortage of suitable land for ginseng production and increased land lease prices for ginseng. In addition, many growers have to travel long distances from their home farms to their fields, resulting in higher fuel and labour costs.

所有跟帖： 

• 才发现你前面那个帖子是问种参的土地为啥要歇十年，还以为是问为什么人参要存十年才吃。真是痴呆了：（ -viewfinder- ♀ (0 bytes) () 06/15/2016 postreply 11:47:53

• 去韩国旅游导游说是因为人参吸取土地的精华太多，所以要休息几年等土地恢复，不知该听谁的。 -羽衣甘蓝- ♂ (0 bytes) () 06/15/2016 postreply 22:21:12