【摘要】 为明确氮素运筹对皖草2号和墨西哥玉米植株吸收矿质元素的影响,本研究分析了皖草2号和墨西哥玉米植株各器官中的矿质元素含量、累积量以及产量变化情况。结果表明,底肥一次性施入300kg/hm2(即N1)处理的皖草2号和墨西哥玉米Ca、Mg、S含量最高,叶片Ca和S含量高于茎,茎Mg含量高于叶片,皖草2号头茬草3种矿质元素含量高于墨西哥玉米;墨西哥玉米单株Ca、Mg、S累积速率和累积量显著高于皖草2号,再生草Ca、Mg、S矿质元素累积速率均呈逐渐下降趋势;皖草2号矿质元素产量显著高于墨西哥玉米,前者分次施肥处理各矿质元素产量高于一次性施肥处理。回归分析表明,皖草2号植株中3种矿质元素对生物量的作用顺序为Ca>S>Mg,墨西哥玉米为S>Mg>Ca,随着Ca、Mg、S三种矿质元素含量升高,2种牧草单株生物量有增加趋势。生产上可以采取一次性施入氮肥300kg/hm2的管理措施,来获取矿质营养较高的牧草。更多还原

【Abstract】 To study the effect of nitrogen application on the absorption of mineral elements in Wancao 2 and Zea mexicana,the content,accumulation rate and output of calcium,magnesium and sulfur in different organs were analyzed.The contents of Ca,Mg and S in Wancao 2 and Z.mexicana were the highest under N1 treatment(300 kg/ha,as base fertilizer).The contents of Ca and S in leaves were higher than those in stalk,while the content of Mg in stalk was higher than that in leaves.The contents of mineral elements in the first harvest of Wancao 2 were higher than those in Z.mexicana.The accumulation rate and amount of Ca,Mg and S in single plants of Z.mexicana were significantly higher than those of Wancao 2,while their accumulation rate declined gradually in aftergrass(growth after the first cut).The output of the three mineral elements in Wancao 2 was significantly higher than that in Z.mexicana.Seperate applications of nitrogen fertilizer increased the output of mineral elements in Wancao 2 compared with total application as base fertilizer.The regression analysis showed that the order of the three mineral elements influencing biomass of Wancao 2 was Ca>S>Mg,while for Z.mexicana it was S>Mg>Ca.The biomass of single plants increased with an increase in the mineral element contents in both herbages.Briefly,a total application of 300 kg/ha nitrogen as base fertilizer should lead to higher mineral nutrition in forages.更多还原