Effect of different concentrations of lupin seed extract on the growth criteria and pigmentation of soybean plant at different growth stages

ABSTRACT

This long-term greenhouse pot experiment study indicated that the application of lupin [Lupinus termis cv. Giza 1] extracts after 30 days of soybean seedling establishment could be effective in enhancing soybean production. Data revealed that soybean growth was stimulated by lupin extract of 5% concentration and no appreciable changes with 15% level, whereas the highest concentration [25%] showed an inhibitory effect. The extent of growth stimulation or inhibition by lupin extracts varied with the measured growth parameters. Regarding the pigments, the shoot of plants treated with lupin extracts contained less chlorophylls and carotenoids than the untreated plants. The magnitude of reduction increased with raising the lupin extract concentration and was greater in older than younger plants