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Four maize (Zea maysL.) hybrids were grown hydroponically for 4 weeks with 20 mmammonium or nitrate as the sole nitrogen source. Dry matter production was strongly depressed by ammonium nutrition in the hybrid Helga relative to plants grown on nitrate, and moderately decreased in the hybrid Melina. Ammonium had no inhibitory effect on total yield in the other two hybrids (Ramses and DK 261). The relative...
The effects of mechanical support on two contrasting species of herbaceous annual, the dicot sunflower (Helianthus annuusL.) and the monocot maize (Zea maysL.), were investigated by comparing the growth and mechanical properties of supported plants and those which were left to sway freely in the wind.Providing support had its greatest effect on the more highly-stressed basal areas of the plants, such...
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