Tropical Grasslands (1980) Volume 14, 6977
PHOSPHORUS RETENTION BY A KRASNOZEM SOIL AND RESPONSE BY A GUINEA-CENTRO PASTURE IN THE WET TROPICS
Seedlings of Centrosema pubescens cv. Belalto were planted in microplots within larger fertilised plots of guinea grass (Panicum maximum) pasture on a north Queensland krasnozem. With six rates of superphosphate, from 0–320 kg ha-1 P, there was no increase in guinea grass yield but the phosphorus concentrations were raised by as much as 0.20 % P. Centro yields were increased 10 months after planting but remained below 10 per cent of the total pasture yield. The largest yield increment was to 20 kg ha-1 P and yields increased up to 160 kg ha-1 P before, decreasing with 320 kg ha-1 P. There were only small increases in the phosphorus concentration of centro.