Abstract
Zinc deficiency is common on the sandy acidic soils in south Western Australia
for grain production of wheat grown with diammonium phosphate containing low
levels of zinc contamination. The effectiveness of zinc fertiliser (zinc oxide
or zinc contamination of single superphosphate that were widely used for crops
in south Western Australia) was measured in 1996 for grain production of
wheat, for zinc applied once only to plots, either in 1996 (current zinc) or
in a previous year (previous zinc) (1983, 1984, 1986, 1990, 1992). Relative to
current zinc applied as zinc oxide with diammonium phosphate, the
effectiveness of previous zinc for dry matter, zinc uptake (zinc concentration
× yield) and grain production of wheat decreased relative to the
effectiveness of current zinc, the decrease being larger with increasing time
since application. Thirteen years after application, the decrease in the
effectiveness was about half for dry matter and grain production where wheat
was grown with diammonium phosphate. Both currently and previously applied
zinc fertiliser increased wheat dry matter, zinc content of the dry matter and
grain yields. Zinc applied as a zinc contaminant in single superphosphate in
1983 produced wheat grain yields on the maximum grain yield plateau (about 2.4
t/ha) achieved for the 5 amounts of zinc oxide applied in the current year
(1996). The critical concentration of zinc in the youngest emerged leaf and
grain for diagnosing zinc deficiency was 12 mg zinc/kg. However, when
relating the zinc concentrations in the youngest emerged leaf to the grain
yield (prognosis), a zinc concentration of 14 mg zinc/kg was determined.
Subject
General Agricultural and Biological Sciences
Cited by
31 articles.
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