Effect of pasture on subsequent wheat crops on a black earth of the Darling Downs. I. The overall experiment

During 1958-68 on the Darling Downs, Queensland, wheat monoculture was compared with rotation involving 4 years of pasture followed by wheat. The pasture was a mixture of Bromus unioloides and Medicago sativa sown at rates of 17 and 15 kg/ha

Correction of sulphur deficiency in lucerne in the Warwick district, Queensland

Yield responses were obtained to applications of S as elemental sulphur, gypsum and superphosphate. An index of the S status of lucerne was derived from the data, using the ratio of % CP/% total S

Comparison of four nitrogenous fertilizers for topdressing winter oats on a Darling Downs soil

Urea, ammonium nitrate, ammonium sulphate and diammonium phosphate were applied at 0, 26 or 52 kg N/ha to oats cv. Camellia on a Darling Downs black earth during the winters of 1971-3

Effect of pasture on subsequent wheat crops on a black earth soil of the Darling Downs. II. Organic C, nitrogen and pH changes

During the 11 year period 1958 to 1968, continuous cropping to wheat was compared with a rotation involving 3 or 4 years of lucerne-prairie grass pasture followed by wheat, on a Darling Downs black earth. Soil chemical measurements made at various times showed that 2 to 4 years of lucerne based pasture increased organic carbon, total N, mineralisable-N, while pH decreased. Soil total N build-up maximised after 2 years of pasture while the residual effect of 3 or 4 years pasture produced significantly higher nitrate-N levels in soil for up to 7 years, and was related to wheat yield and quality improvements

Effects of nitrogen fertilizer on the yield and malting quality of barley on the Southern Darling Downs, Queensland

The effect of N fertilizer (0-2 cwt urea/ac) on yield and malting quality of barley on red loam soils was studied during 1961-4. High N (2 cwt urea/ac) tended to increase yield and grain protein percentage but decreased predicted malt extract

Nutritional investigations in irrigated maize on some black earth soils, Darling Downs, Queensland

Results of 5 fertilizer trials at 4 localities to determine nutrient deficiencies and assess fertilizer requirements are summarized. Significant grain yield responses in maize were obtained only to N and, in one locality, to P. Zn unavailability may occur sporadically on irrigated country. K, Mn, B, Mo and Fe had no effects on foliage or grain yields. In P-deficient areas, N and P are required in combination to secure highest yields