New Zealand Journal of Agricultural Research abstracts
Phosphorus absorption capacity of Lotus corniculatus and Festuca
arundinacea during sward establishment
A. T. AYALA TORALES
V. A. DEREGIBUS
P. R. MOAURO
Cátedra de Forrajicultura
Facultad de Agronomía
Universidad de Buenos Aires
(1417) Av San Martín 4453
Capital Federal, República Argentina
Abstract Lotus corniculatus and Festuca
arundinacea are currently sown in phosphorus deficient soils of the
mesothermal humid Pampas, in Argentina. We hypothesised that the legume
seedlings might withstand competition from grass through greater phosphorus
root absorption capacity which would result in higher nutrient acquisition, and
compared phosphorus absorption capacity and total phosphorus acquisition of
both species at increasing levels of P supply during seedling establishment.
Plants grown in a greenhouse were harvested 40 days after sowing. Biomass
productivity and phosphorus content of shoots and roots were used to calculate
phosphorus absorption capacity per unit of root biomass and phosphorus
acquisition per plant. Birdsfoot trefoil showed higher root phosphorus
absorption capacity at P supply up to 25 ppm in soil (P < 0.05),
which resulted in nutrient acquisition similar to tall fescue although trefoil
showed lower root biomass over all levels of P supply (P
< 0.05). The higher phosphorus absorption capacity plus higher root
tissue phosphorus concentration of trefoil (P supply up to 100 ppm, P
< 0.05) may assist legume establishment in mixed swards with tall fescue.
Keywords Lotus corniculatus; Festuca
arundinacea; phosphorus fertilisation; phosphorus absorption capacity;
phosphorus acquisition
New Zealand Journal of Agricultural Research, 1998, Vol. 41: 307-312
0028-8233/98/4103-0307 $7.00/0 (c) The Royal Society of New Zealand
1998
PDF file of entire paper: medium quality (399K); (scanned from paper original: notes about this process)
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