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isogram n.【氣象學】等值線(圖)。

isograph

On the basis of the isograms , we analyzed the variation law of yield and grain protein content with soil water content , nitrogen and p2o5 , 用等值線圖描述產量和蛋白質含量的水氮和氮磷兩因素效應,分析產量和蛋白質含量變化規律及其關系,確定實現一定生產目標的水肥管理方案。