RELEASE CHARACTERISTICS AND EFFECTS ON EUCALYPTUS TREE GROWTH OF FERTILIZER FROM WOOD RESIDUE SLOW-RELEASE FERTILIZER SHELL
To investigate the release characteristics and effects on tree growth of fertilizer from wood
residue slow-release fertilizer shells, fertilizer was loaded into the wood residue shells and the resultant
slow-release fertilizers were evaluated using eucalyptus fertilization tests. The growth parameters (girth,
height, and standing volume) and nutrient contents of soil and tree leaves were monitored regularly to
evaluate the effects of wood residue slow-release fertilizer shells on tree growth and to determine the
process by which fertilizer was released. Fertilizer-loaded Pinus massoniana and Toona sinensis shells
and straight fertilizer can all significantly improve growth, eg girth at breast height, height, and standing
volume. The K, N, and P contents in soil and tree leaves were not significantly different among groups
treated with P. massoniana and T. sinensis residue shell slow-release fertilizer and straight fertilizer,
which suggests that these three fertilizers did not differ with respect to effects on soil nutrients and leaf
nutrients. Wood residue shell slow-release fertilizer can significantly increase tree growth, including
growth in girth, height, and standing volume. These shells provide satisfactory fertilizer release dynamics.
Toona sinensis shells provided better slow-release properties than did P. massoniana shells.
Keywords: Forest fertilization test, nutrients, tree growth, wood residue shell slow-release fertilizer.
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