Notes:
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12 tables, 29 refs.
With: Economic analysis for the deep ripping, gypsum and complete nutrient package / Graem McConell -- The association between rainfall and wheat yield in the low rainfall areas of Western Australia / M.A. Hamza and W.K. Anderson. -- Improving soil physical fertility and crop yield on a clay soil in Western Australia / M.A. Hamza and W.K. Anderson. -- Effect of competition between gypsum, potassium, iron and sulphur on lupin yield / M.A. Hamza and W.K. Anderson.
refs.
(En)
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