Journal
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
Volume 40, Issue 15-16, Pages 2616-2637Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00103620902896761
Keywords
Lint yield; M-DRIS; nitrogen; northern Australia; nutrient ratios; nutrition; P sorption; plant mapping; potassium; zinc
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Funding
- Cotton Research and Development Corporation [CSP 138C]
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Considerable amounts of phosphorus (P) fertilizer will be required on soils in the proposed Ord Stage II area of northwestern Australia if a sustainable dry-season cotton production system is to be established, because in their virgin state the soils are known to be inherently low in P. This study aimed to determine P fertilizer requirements on these soils to optimize cotton yield as well as nutrient uptake. Five rates of P fertilizer were applied to soil recently cleared of trees and prepared for irrigation. In the second year, these same rates were imposed over the trial. We conclude that the application of 60kgha-1 of P was sufficient to allow maximum yield and quality for dry-season cotton grown in the first season on virgin soils in the Ord River Irrigation Area, whereas a total of 80kgha-1 of P was required when cotton was grown over two seasons.
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