Fertigation method affects performance of 'Lapins' sweet cherry on Gisela 5 rootstock.

摘要

'Lapins' sweet cherry (Prunus avium) trees on Gisela 5 (Prunus cerasus x Prunus canescens) rootstock were maintained for the first 4 growing seasons with 8 different fertigation treatments at Summerland, British Columbia, Canada. Treatments involved N application at low (42 mg litre-1), medium (84 mg litre-1) and high (168 mg litre-1) concentrations via sprinkler-fertigation of Ca(NO3)2 each year approximately 8 weeks after bloom. The medium N treatment was also applied with P fertigation in early spring or with K fertigation in June. N was also broadcast in early spring at 75 kg ha-1 or followed with medium N sprinkler-fertigated postharvest in August. As a final treatment, the medium root zone N concentration was maintained for 8 weeks postbloom via drip fertigation. Throughout the study, irrigation was scheduled to meet evaporative demand based on an electronic atmometer. Drip fertigation, which wet a smaller portion of the orchard floor, considerably reduced per-tree water applications. Tree vigour and pruning weights were reduced for drip-fertigated compared with sprinkler-fertigated trees although cumulative yield was not significantly different during the study. Fruit size, however, was smaller for this treatment when crop load was at a maximum at year 4. Leaf and fruit N increased linearly as N concentration of sprinkler-fertigating solution increased from low to high values. Optimum yield and highest fruit quality were associated with the medium N treatment. Sprinkler fertigation of P and K did not increase leaf and fruit concentration of either nutrient or meaningfully affect tree performance.