Application of living mulch in rows of the apple trees on several rootstocks – long-term evaluation
Maria Licznar-Małańczuk
Department of Horticulture, Wroclaw University of Environmental and Life Sciences, Grunwaldzki sq. 24a, 50-363 Wrocław, Polandhttps://orcid.org/0000-0003-0996-2049
Iwona Kwiecińska
Department of Horticulture, Wroclaw University of Environmental and Life Sciences, Grunwaldzki sq. 24a, 50-363 Wrocław, PolandAbstract
The long-term influence of several living mulches on apple tree growth, nutrient status, yield, and fruit quality concerning the year of cover crop sowing in tree rows was evaluated in the Lower Silesia region in the southwestern part of Poland. The estimation was conducted in six apple tree ‘Ligol’ populations differentiated by the rootstock: M.26, M.9, P 60, P 2, P 16, and P 22. In experiment no. 1, one-year-old nursery stock was planted, and perennial living mulches were sown: colonial bent grass (Agrostis vulgaris With.) and white clover (Trifolium repens L.) in the same year and blue fescue (Festuca ovina L.) in the following year. In experiment no. 2, which involved two-year-old stock, the sowing of blue fescue was delayed until the second, third, fourth, and fifth years following orchard planting.
The presence of the cover crop significantly affected young tree growth when one-year-old trees were planted. The sowing of the living mulch in the first or the second year after tree planting led to a significant reduction in the cumulative yield obtained from the young trees. The living mulch improved the red coloration of the fruit skin in the young orchard, but it caused a reduction in the mean fruit weight and size. However, it also contributed to decreased nitrogen concentration in the leaves of the apple trees, and the tree tolerance to living mulch increased as the orchard aged. A choice of semidwarf rootstock, postponed sowing of cover crop, and high-quality nursery stock were recognized as the most important factors for fostering apple tree tolerance to living mulches in tree rows.
Keywords:
orchard floor management, cover crop, fescue, colonial bent grass, cloverReferences
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Department of Horticulture, Wroclaw University of Environmental and Life Sciences, Grunwaldzki sq. 24a, 50-363 Wrocław, Poland https://orcid.org/0000-0003-0996-2049
Department of Horticulture, Wroclaw University of Environmental and Life Sciences, Grunwaldzki sq. 24a, 50-363 Wrocław, Poland
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