The Practicality of Top-root Ratio in Nursery Stock Characterization | Zendy

G. D. Racey | Zendy; C. Glerum | Zendy; R.E. Hutchison | Zendy

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The Practicality of Top-root Ratio in Nursery Stock Characterization

Author(s) -

G. D. Racey,

C. Glerum,

R.E. Hutchison

Publication year - 1983

Publication title -

the forestry chronicle

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.335

H-Index - 49

eISSN - 1499-9315

pISSN - 0015-7546

DOI - 10.5558/tfc59240-5

Subject(s) - stock (firearms) , mathematics , statistics , volume (thermodynamics) , environmental science , horticulture , biology , physics , geography , thermodynamics , archaeology

Top-root ratios (T/R) form a non-normal frequency distribution which is positively skewed or skewed to the right, creating a bias in the estimate of a sample mean. T/R's determined by volume displacement give larger estimates than those determined by oven-dry weight. This difference increases with the size and T/R of the tree. Top length, stem diameter, top volume and root volume are all better indicators of nursery stock quality and potential growth performance than T/R. As top-root ratio is difficult to interpret or use in an objective manner it is of little value in nursery stock evaluation.

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