Liming experiments were conducted at 13 sites (soil pH range 4.99-6.27, 0-10 cm depth) in the dryland cropping region of north-eastern Victoria with wheat grown at all sites and barley at 3 sites. Lime increased wheat yields at 9 of the 13 sites with the acid sensitive cultivar Oxley, but the yield increase was not correlated (r2=0.07) with exchangeable Al. Exchangeable A1 was closely related to pH (in 0.01 mmol/L CaCl2). The acid-tolerant wheat cultivars (Matong and Millewa) out-yielded Oxley at a soil pH (CaCl2) of 4.7 and the acid-tolerant cultivars were less responsive to liming. The barley responded to the lime treatment at each of the 3 sites. The use of acid tolerant crop species is recommended on these soils, but an improvement in the predictability of a lime response is required before liming is widely recommended.
Nineteen accessions of eight Stylosanthes species were grown in association with volunteer species (mainly native grasses) for three years in small mown swards at three different sites in central Queensland. The outstanding accessions for dry matter yield were S. scabra 40292 and 40205: they significantly out-yielded S. hamata cv. Verano at all three sites and their plant densities in the third year at the wettest site were significantly higher than all other accessions except S. scabra 49833. At all sites, 'Verano' gave significantly higher mean annual dry matter yields than S. guyanensis cv. Oxley and S. humilis cv. Paterson. Other accessions that showed promise were S. scabra 49833 and 40289 and S. viscosa 34904: the latter accession performed relatively better at the wettest site.
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