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明尼苏达州西南部流域土壤水分记录的一个唯一序列指出利用有效降水的方式.这些记录,目前已有17年(1960年～1976年),它们包括从过量降水期到干旱的1976年这一段时间范围内的气候极值年份.该流域在美国中西部玉米种植带的西部,那里的土壤完全用水再补充的情形是很少有的,美国有一半以上的地区有再补充条件,而这一玉米种植带的大部分地区却没有这样的条件.
A unique sequence of soil moisture records in the southwestern Minnesota basin indicates the use of effective precipitation patterns, which have now been recorded for 17 years (1960-1976) and ranged from an over-precipitation period to a droughty 1976 period Within the extreme years of the climate in the western part of the United States, west of the Corn Belt in the Midwestern United States where there is very little replenishment of the soil with complete water and more than half of the United States is replenished, In most parts of the belt there is no such condition.