The comparative phosphorus requirements of some temperate perennial legumes

Abstract

The phosphorus (P) responses of seven temperate perennial pasture legumes and two species of lupins were compared in a field trial over a range of nine P rates, from 0 to 800 kg ha -1. The two lupins produced more than 5 t ha-~ of dry matter in the absence of added P and showed no response to the fertiliser. In contrast, the pasture legumes initially failed to grow without added P and responded to applications of between 200 and 800 kg ha -~. At the higher rates of P, dry matter production of the pasture legumes was equivalent to that of the lupins.In the first 2 years of the trial; the most productive pasture legume species at the higher rates of added P were also the most productive at the lower rates. Phosphorus requirements for 90% of maximum yield varied greatly between species, but were closely related to maximum yield. Thus species with low P requirements for maximum yield were not necessarily P-efficient species. In the third and subsequent years of the trial Lotus corniculatus performed better than the other pasture legumes at the lower rates of added P. In contrast to other studies Lotus pedunculatus showed no ability to outyield Trifolium repens at low rates of P. Critical P concentrations of the pasture species for the late spring-early summer period declined in the order Trifolium repens (0.34%)> Lotus pedunculatus (0.30%)> Triofolium pratense (0.28%)> Trifolium hybridum (0.27%)> Trifolium ambiguum (0.26%) > Lotus corniculatus (0.23%).Mineralisable nitrogen (N) levels were determined in soils under three species in the 7th year of the trial. At the lowest rates of added P, mineralisable N levels were much higher under Lupinus polyphyllus than under Trifolium repens or Lotus corniculatus. With increasing P rate, levels under the latter species increased, and at 100 kg P ha -1 were equivalent to those under the lupin with no added P.

Phosphorus requirements and nitrogen accumulation by three mungbean (Vigna radiata (L) Welzek) cultivars

“…Whether this was a significant factor in the better growth of T-77 under zero P needs further investigation. Davis (1991) however reported that species with low P requirements for maximum yield were not necessarily P-efficient species.…”

Predicting the Phytoextraction Duration to Remediate Heavy Metal Contaminated Soils

“…For this reason, we decided to use data on dry matter production from field experiments reported elsewhere in the literature. The dry matter production by L. hartwegii was set at 5,200 kg dm ha −1 year −1 (Davis, 1991). This author reported results on the dry matter production by Lupinus arboreus in a field experiment in which different amounts of P were applied.…”

Sustainability of New Zealand high‐country pastures under contrasting development inputs. 2. Soil inorganic components

“…Svavarsdottir (1995) also reported very high mean organic P in 0-15 cm samples in a similar study on the same soil type, determined by the same ignition and difference method. That study gave values 13 years after a single application of 9 superphosphate treatments applied at a geometrically increasing rate up to 800 kg ha" 1 (Davis 1991). The trial was ungrazed.…”