Phosphorus efficiency in pasture species, 6. A comparison of Italian ryegrass, phalaris, red clover and white clover over time.
1991
Kemp P.D. | Blair G.J.
The effects of level of phosphorus supply, plant age, and time of harvest on various measures of P efficiency were examined in glasshouse trials. Italian ryegrass was the most P efficient and red clover the least in terms of the broad scale measures, shoot yield per unit P applied, and total P uptake over 40 days from sowing, and shoot P concentration at 68 days. But by 68 days the shoot fresh weight of the 4 species was similar at low and high rates of P. The early superiority of the grasses over the clovers was largely the result of greater root weight and P uptake per plant. When ryegrass and phalaris are compared on an ontogenetic basis, number of leaves per plant, shoot yield and P uptake per plant were similar. The comparison of the P efficiency of species on both an ontogenetic and temporal basis is proposed.
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