Maize fertilizer investigations on red loam soils of the southern Darling Downs, Queensland

Steadily declining maize yields on red loam soils indicated a depletion in nutrient status through continuous grain cropping. In a series of three field trials, marked yield responses were obtained to phosphorus (as superphosphate) application in one season, and to nitrogen (as urea) in the other two seasons. Applications of potash and mixtures of trace elements were of little significance

Control of Johnson grass patches in cultivation using glyphosate

Complete control was achieved with 0.09 percent glyphosate applied in November and again in February and April. Applications in November repeated in February (at concentrations up to 0.24 percent) or single applications in November or April (at concentrations up to 0.36 percent) failed to control the weed completely. At concentrations of 0.24 and 0.18 percent, there were no significant differences in initial control achieved irrespective of timing or number of applications. However, at 0.09 and 0.045 percent there were indications of greater activity of glyphosate when applied in autumn rather than in early or late summer

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