Long term minimum tillage investigations.

Trial 77M13 Location: Merredin This site was in wheat in 1975 and 1976 before the treatments commenced on continuous wheat in 1977. 77M56 Location: Merredin Sited alongside 77M13 with the same paddock history. Commenced the wheat/pasture rotation after wheat in 1975 and 1976. Trial 86M79 Chemical and cultivated fallow in a pasture/wheat rotation on heavy land. Location: Merredin. At Merredin on salmon gum/gimlet soil. Pasture treatments and soil moisture measurements were conducted in 1990. Wheat 1991. Trial 87NA80, 81, 82, 83 Direct drilling with modified combines compared with cultivation for pasture/wheat rotations with grass control treatments in the pasture year. Location: Corrigin. These trials commenced in 1986 (with Me numbers) on the property of Peter Copestake - Corrigin. Peter does the cultivation and seeding treatments with his own machinery at normal speeds. 87NA80-83 pasture/wheat rotation. 87NA80,83 in crop in even years, 87NA81,82 in crop in odd years. 87NA80, 81 grey sand/clay, 87NA82, 83 yellow loamy sand with gravel in NA82. Trial 85SG28 Grey-brown calcareous earth - Kumarl Location: Salmon Gums A long term trial comparing direct drill with a combine to 2 cultivations prior to seeding, under three rotations (continuous wheat, wheat/pasture, wheat/fallow). Chemical and cultivated fallow. Site history - fallow 82, wheat 83, pasture 84 consisting of barley grass, goldfields burr medic, cyprus medic and wild mustard. Pasture plots sown with Serena medic in rotation in 1985 and 1986. Trial 88EB12 Direct drilling and scarifying - Duplex soil Paddock was in lupins (poor) 1987. Site is gritty sand over clay at variable depth 20-35 cm, average 25 cm. Wheat 1988, lupins 1989, wheat 199