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美国康乃尔大学食品科学研究所的研究人员发现,对马铃薯每英亩施用40～100磅硫酸镁,其块茎总含氮量、蛋白质含
Researchers at the Institute of Food Science at Cornell University found that applying 40 to 100 pounds of magnesium sulfate per acre to potatoes has a total nitrogen content of tubers,