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Backgroud and aims Plant boron (B) status is known to affect plant secondary metabolites but most studies have been short termed and in controlled environments. Copper (Cu) effects on phenolics are better known at toxic than at low levels. Here, the chemistry of Scots pine (Pinus sylvestris L.) needles was studied 20 years after fertilisation with B and Cu in a long-term field experiment on a drained...
Samples obtained from two planting experiments with tropical shrub legumes rich in condensed tannins (CT) (Calliandra calothyrsus, Flemingia macrophylla, Leucaena leucocephala) were analysed in detail for CT concentration, composition and properties, as well as for in vitro degradability. The factors evaluated included cultivation site (fertile mollisol with pH 7.8 and bimodal rainfall vs. infertile...
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