PJB-2019-914
ASSESSMENT OF THE GROWTH POTENTIAL OF TWO WHITE LUPIN GENOTYPES (LUPINUS ALBUS L.) IN CALCAREOUS SOILS
soumaya Tounsi-Hammami
Abstract
The purpose of the present investigation was to assess, under pot experiment, nodulation and plant growth of two white lupin genotypes: Mekna (Tunisian genotype) and Lumen (French genotype) planted in soils sampled from 56 distant locations in Tunisia. More than 75% of soils were classified as alkaline and calcareous. Nodulation was absent in 41 soils, abundant in 2 (Sejnen and Mraissa), and scarce but efficient in the remaining 13 soils. Mekna developed significantly more root nodules and in more soils than Lumen. The growth of lupin plants varied widely among soils. Compared to Mekna, correlation analysis showed a high sensibility of Lumen to soil active lime content. When considering the productive performance of the two genotypes, three soil classes were defined based on their ability to grow in as follows: lupin plants (i) didn’t grow, (ii) grown but with showing chlorosis symptoms and (iii) grown well without showing any chlorotic symptoms. The third class included soils of Madian, Tejerouin, Benouria, and Ouedzinga containing high active lime content ranging from 26 to 31%. This finding suggests that the genotype Mekna can be planted in calcareous soils. This study revealed also the présense of native rhizobia in alkaline Tunisian soils that are compatible with white lupin which might be isolated and used as biofertilizers to promote the development of this legume in Tunisia.
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