RESPONSE OF APPLE-TREES TO FERTIGATION-INDUCED SOIL ACIDIFICATION

被引:21
作者
NEILSEN, GH [1 ]
PARCHOMCHUK, P [1 ]
HOGUE, EJ [1 ]
WOLK, WD [1 ]
LAU, OL [1 ]
机构
[1] OKANAGAN FEDERATED SHIPPERS ASSOC,KELOWNA V1Y 3H5,BC,CANADA
关键词
VIGOR; YIELD; FRUIT CA; LEAF K; MN AND CU;
D O I
10.4141/cjps94-067
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Summerland McIntosh apple trees (Malus domestica Borkh.) on M.9 rootstock were fertigated for the first 3 yr after planting with all combinations of two rates of N (23.5 and 47.0 g tree(-1)) and three rates of P (0, 17.5 and 35 g tree(-1)). During this period, soil pH (0.01M CaCl2) beneath and near the drip emitters declined from 5.8 to < 4.0. Rate of fertigated N had few measurable effects on the trees. In contrast, fertigated P increased first-year tree vigour, second-year tree yield, and sometimes leaf Ca and Mg and leaf and fruit P concentrations. None of these nutrient concentrations were near critical values. Fertigated P also decreased leaf concentrations of K and Cu, which reached deficiency after 3 yr, and did not ameliorate the decline in tree vigour attributed to soil acidification. Increased Mn concentration in leaves was the most distinctive plant indicator of soil acidification, while decreased leaf K was the most important basic cation affected. Fruit Ca was not affected by the decrease in soil Ca availability.
引用
收藏
页码:347 / 351
页数:5
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