The comparative applied phosphate requirements of eight annual pasture species

摘要: The effects of a wide range applied phosphate levels were compared on eight annual pasture species. Marked differences found between species in response by tops, roots, or whole plant, and top/root ratio. Different forms yield curve given the non-legumes, clovers, lupin. At an early growth stage cape-weed, three erodium highest phosphorus requirement for near-maximum yield. full flowering stage, ranked following decreasing order requirement: cupped clover > rose subterranean lupin = cape-weed Wimmera ryegrass silver grass. Yields concentrations are relation to levels. In vegetative all needed at least 0.7% tops maximum yield, but this had fallen very much lower It is suggested that large enough influence strongly botanical composition its fertilizer requirements.