Effect of Planting Density on Root Growth in 'Starking Delicious' Apple Trees Grafted on Dwarfing and Semi-dwarfing Rootstocks
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Accession number;06A0073885
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| Title;Effect of Planting Density on Root Growth in 'Starking Delicious' Apple Trees Grafted on Dwarfing and Semi-dwarfing Rootstocks |
| Author;
KURODA HARUYUKI
(NARO, National Agricultural Res. Center for Hokkaido Region, JPN)
CHIBA KAZUHIKO
(NARO, National Agricultural Res. Center for Hokkaido Region, JPN)
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Journal Title;Journal of the Japanese Society for Horticultural Science
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Journal Code:F0626A
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ISSN:0013-7626
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VOL.75;NO.1;PAGE.91-99(2006)
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| Figure&Table&Reference;FIG.6, TBL.4, REF.23 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The effect of planting density on root growth was studied in 11 to 13-year-old 'Starking Delicious' apple trees (Malus domestica Borkh.) grafted on M.9, M.26, M.7 and MM.106 without pruning. At the 330 trees/ha plot the root system was composed of major lateral roots with few vertical sinkers, but at the 3178 trees/ha plot it was mainly of lateral roots. The root spread decreased as planting density increased, but the degree of intermingling of adjacent root systems increased. At the 3178 trees/ha plot the adhesion phenomenon between adjacent root systems was observed. The root/canopy spread ratio decreased as planting density increased, indicating that root spread was more strongly inhibited than canopy spread by an increase of plant density. The distribution ratio of root weight with depth was not affected by planting density, but the root dry weight per tree in each depth decreased as planting density increased, particularly in the major (>15mm) root of the 0-30 cm layer. On all rootstocks, the root dry weight per tree (R) decreased as planting density (.RHO.) increased. The relationship between R and .RHO. could be represented by the reciprocal equation: 1/R=AR.RHO.+BR-(1), where AR and BR are the coefficients depending on the tree age and rootstock. The relationship between root dry weight per tree (R) and trunk cross-sectional area (.THETA.) could be represented by the relative growth equation with h>1:R=H.THETA.'h'-(3), where H is the coefficient depending on rootstock. The root dry weight per hectare in each depth increased as planting density increased, and the increase was markedly in the fine (<1 mm) and small (1-5 mm) roots. On all rootstocks, the root dry weight per hectare (R) increased as planting density (.RHO.) increased.... (author abst.) |
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