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Field calibration of a soil sulfate test on sward lucerne on the eastern Darling Downs, Queensland

, : Field calibration of a soil sulfate test on sward lucerne on the eastern Darling Downs, Queensland. Australian Journal of Experimental Agriculture and Animal Husbandry 21(110): 303-310

In 1975, the relation between phosphate-extractable sulphate and the response of lucerne to applying 0 or 100 kg S/ha was examined on 20 established lucerne swards on black earths of the Darling Downs. 6 sites responded at the 1st cut and relative DM yield of lucerne was correlated with soil sulphate. The best fit of data was obtained using a square root quadratic model and soil sulphate from 0-80 cm deep. Critical soil conc. was 3.5 p.p.m.


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