Abstract: The effects of selenium fertilizer and selenium and cobalt mixed fertilizer on the forage yield and quality of alfalfa(Medicago sativa L.) were studied by leaf-spraying during growing durations in the soil and climate conditions of Yellow River bottomland in Henan Province.The results show that the selenium fertilizer and selenium and cobalt mixed fertilizer increased significantly the ratio of stem to leaf and decreased the ratio of fresh weight to dry weight;increased the dry matter content in alfalfa forage from shooting stage to florescence stage;increased the plant height of alfalfa from flowering stage to ripening stage.Selenium fertilizer promoted only the forage yield during vegetative periods;however selenium and cobalt mixed fertilizer promoted the forage yield during the whole growing durations.Moreover,selenium fertilizer and selenium and cobalt mixed fertilizer enhanced not only the contents of Se and Co of alfalfa hay significantly,but also the contents of 6 kinds of other trace elements(Fe,Mn,Cu,Zn,Mo,and B)obviously,especially that of Se and Mo.Selenium and cobalt mixed fertilizer increased the contents of crude protein,ash,and calcium and decreased the contents of water and crude fibre of alfalfa hay significantly in favor of good forage quality.

Key words: Selenium, Cobalt, Alfalfa, Yield, Quality

摘要： 在河南省黄河滩区,研究叶面喷洒硒肥以及硒钴配施,对紫花苜蓿产草量和品质的影响。结果表明:2种微肥在分枝期到开花期能够显著地提高苜蓿茎叶比,降低鲜干比,增加干物质含量;从开花期到成熟期能显著地提高其株高;硒肥仅能提高苜蓿营养生长期的产草量,而硒钴配施则能显著提高总产草量;硒以及硒钴配施不但能显著提高青干草中的硒钴含量,而且能显著提高Fe、Mn、Cu、Zn、Mo和B等微量元素的含量,其中以Se和Mo的提高幅度最大;硒钴配施能显著提高干草粗蛋白质、粗灰分和钙的含量,显著降低含水量和粗纤维含量,改善牧草品质。

关键词: 硒, 钴, 紫花苜蓿, 产草量, 品质