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(二)对土壤肥力的影响大多数长期肥料试验在试验后期进行了土壤肥力性状的分析比较,但只有少数试验进行了土壤肥力历史演变的分析比较.Broadbalk自1865年以来;Hoos-field自1882年以来,都进行过多次土壤分析测定;Askov最早的土壤样品采于1923年,但1949年以后才有系统的土壤分析资料;Morrow试验则仅有少数历史资料可供比较.十分可惜的是,没有一个长期肥料试验在试验开始便进行土壤肥力性状的详细分析和记载.
(II) Impact on Soil Fertility Most of the long-term fertilizers tested and compared soil fertility traits later in the experiment, but only a few trials analyzed and compared the historical evolution of soil fertility. Since Broadbalk has been around since 1865, Hoos-field since 1882 Soil analysis has been performed many times since the year; Askov’s earliest soil samples were collected in 1923, but systematic soil analysis data were not available after 1949. Morrow’s test has only a few historical data available for comparison. None of the long-term fertilizer trials carried out detailed analyzes and records of soil fertility traits at the start of the experiment.