Evaluation of the Abundance or Deficiency of Micronutrient in Soil and Leaves of Different Kinds of Citrus Orchards and Tree Ages [不同种类和树龄柑橘园土壤和叶片微量元素含量与丰缺评价]

作者：Weifang H.; Zhaohuan H.; Guangyan Z.; Yun Z.; Mu Z.; Jiwu Z.; Xinnian Z.; Aitian P.; Baoxin Z.; Duo L.; Guoliang L.^*

来源：园艺学报, 2021, 48(12): 2325-2335.

DOI：10.16420/j.issn.0513-353x.2020-1006

• citrus
• leaf
• micronutrient
• nutrient diagnosis
• orchard
• soil

The collected leaves and soil samples from 243 sampling units in representative orchards of Guangdong Province and determined their micronutrient concentrations. There was a relatively high significant difference in leaves Cu and Mo as well as soil available Mn, Cu, Zn, and B contents, while similar contents were found in leaves B and soil available Mo. Most of the leaves B and soil available Mo were in the optimum ranges(> 60%), while most of the leaves Mo and soil available B were in the deficiency level (> 50%)in orange, grapefruit, and mandarin orchards. In orange orchards, all soil available B and Mn, as well as most of leaves Zn(77.8%), soil available Cu(50.0%), and Zn(55.6%)were in the deficiency level. The soil available Zn and leaves Cu in grapefruit orchards, and soil available Cu and Fe in orange and mandarin orchards were in the excess level. The distribution proportion of micronutrients in leaves and soil available Fe, Mn, and Mo of different tree ages were similar. The excess percentage of soil available Cu in short-age(3–8 years old)and old trees(> 8 years old)(> 60%)was higher than that of young trees(< 3 years old)(48%). There were significant positive correlations between leaves and soil available Fe, Mn, Cu, and B in mandarin orchards, as well as between leaves and soil available Fe and Cu in grapefruit orchards. Fitting indicators of leaves and soil available Fe, Mn, and Cu in grapefruit orchards were higher than that of orange and mandarin orchards. There was a significant positive correlation between leaves and soil available Mn, Cu, and B in both old and short-age trees, and between leaves and soil available Zn in short-age trees. The fitting indicators between leaves and soil available Fe of different tree ages were as follows: young trees > short-age trees > old trees. Canonical correlation analysis results show that leaves Cu in mandarin and grapefruit orchards, leaves B and Fe in old trees, and leaves Mo and Mn in short-age trees could be used to diagnose the abundance or deficiency of micronutrient in different species and ages of citrus orchards. Soil available Zn and B in mandarin orchards and short-age trees, soil available Cu in grapefruit orchards, and soil available B and Fe in old trees were the key factors affecting the tree micronutrient among different species and ages of citrus orchards, which should be paid more attention in the management of citrus orchard fertilization.

• 出版日期2021
• 单位华南农业大学