EFFECTS OF SULPHUR AND PHOSPHORUS FERTILIZATION ON THE YIELD AND QUALITY OF BARLEY (Hordeum vulgare L.) IN THREE SOUTHWESTERN QUEBEC SOILS

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Abstract
Field studies were conducted on 3 southwestern Quebec soils for 2 yr to provide information on effects of S fertilization on barley growth, to examine any S-P interaction, and to assess contributions of S from rain during the growing season. The treatments were arranged in a factorial combination of 4 levels of S (0, 15.6 or 31.2, 62.4 and 93.6 kg S/ha) with 3 levels of P (0, 117 and 234 kg P2O5/ha) added as gypsum and triple superphosphate, respectively. Added S either had an inconsistent effect or no effect on barley yield on the experimental soils. The lack of response was attributed to annual S additions from rain estimated to be in excess of 10 kg S .cntdot. ha-1 .cntdot. yr-1 and high levels of available S in the soils. No S-P interaction was observed, indicating that high P fertilization should not result in S deficiencies for barley in southwestern Quebec.
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