澳洲坚果矿质养分周年变化研究(英文)

目的]研究澳洲坚果叶片的营养特性,掌握其营养规律和特点,为科学合理施肥提供依据,也为今后选育营养高效的澳洲坚果品种提供参考。研究澳洲坚果叶片中9种矿质元素含量的周年变化。方法]选取6年生桂热1号澳洲坚果健康植株,2011年每月15日在所选20株树的东南西北4个方向,采集枝条顶部往下第2轮叶1片,分别测定N、P、K、Ca、Mg、Zn、Cu、Fe、Mn等9种矿质元素的含量。结果]叶片N、P、K含量在4月均出现高峰,之后随时间推移N含量缓慢下降,P含量保持稳定,而K含量略有升高;Ca、Fe含量在4月时均有不同程度降低,之后缓慢升高,Mg周年含量保持基本稳定,而Mn含量周年缓慢降低;Cu、Zn含量4月达高峰,之后含量先减后增。结论]生产实践中应及时补充N、K、Ca和Fe等元素。

Annual Variation of Mineral Nutrition Elements Content in Macadamia integrifolia

Objective] To investigate the annual variation of 9 mineral nutrition ele-ments content in Macadamia integrifolia leaves. Method] Twenty 6-year-old ＆quot;Guire No. 1＆quot; healthy plants were selected. On the 15th of every month in 2011, 1 leaf in the second round from top-branch in 4 directions of the 20 trees was col ected. The content of 9 mineral elements of N, P, K, Ca, Mg, Zn, Cu, Fe and Mn were deter-mined. Result] The results showed that the N, P, K content in leaves reached a peak in April, then N content decreased slowly, P content stayed stable, and K con-tent increased slightly; Ca, Fe content decreased in April to different degrees and then increased slowly. Mg content was consistent al year round, meanwhile Mn content decreased slightly. Cu and Zn content reached a peak in April, and then presented a rise-fal trend. Conclusion] N, K, Ca, Mg should be supplemented in time in practice.