ISHS Acta Horticulturae 363: III International Symposium on Replant Problems
APPLE TREE GROWTH RESPONSE TO N FERTIGATION OF REPLANT SOIL: COMPARISON OF GREENHOUSE POT TESTS AND FIELD RESULTS |
| Authors: | P. Parchomchuk, G.H. Neilsen, E.J. Hogue |
| Abstract:
Greenhouse pot tests were conducted with apple seedlings to determine appropriate rates and schedules for applying N fertilizer to a suspected replant-disease soil. Rates of N application (25, 50 and 100 μg N/g of oven dried soil, applied as NH4NO3) had no effect on growth of potted seedlings. However, growth was improved by applying the dissolved fertilizer in multiple doses with the irrigation water rather than broadcasting a single application of granular fertilizer on the soil surface. Fertigated seedlings did not grow as rapidly as seedlings planted in soil which has been thermally sterilized prior to planting, indicating the possible presence of replant disease. In a subsequent field experiment, no evidence of replant problems was encountered when Gala/M.9 apple trees were planted in the same soil. First year growth was favourable and did not vary with varying rates of N nor with the method of application. | |
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