The growth of Lupinus species on alkaline soils
1995
Tang, C. | Robson, A.D. | Longnecker, N.E. (Western Australia Univ., Nedlands. Soil Science and Plant Nutrition) | Buirchell, B.J. (Western Australian Dept. of Agriculture, South Perth. Div. of Plant Industry)
In field studies, the growth of 13 lupin genotypes reliant on N2 fixation, or receiving ammonium nitrate, at 4 sites with various combinations of soil pH and texture were examined. Plants grown on an alkaline clay and an alkaline sand showed iron chlorosis at early stages, and had a slower shoot growth than those grown on an acid loam or an acid sand. Species varied greatly in severity of iron chlorosis and also in growth and seed yield, with L. angustifolius, L. luteus and L. albus more affected than L. pilosus, L. atlanticus and L. cosentinii. Rankings of growth and seed yield of the lupin genotypes on the alkaline clay correlated well with the rankings on the alkaline sand soil. Plants that had severe Fe chlorosis in alkaline clay also had severe chlorosis in alkaline sands. However, correlation between the severity of iron chlorosis and early shoot growth was poor. The results suggest that high pH and-or high bicarbonate are more likely than soil texture to be the primary factors restricting the growth of commercial lupins.
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