Long-term rotation trials.

Trial 66M29 Location: Merredin Research Station. An old land site, cleared in 1909. First sown to Cyprus Barrel medic in 1955, grazed and topdressed. Cropped, 1962 and 1964. Medic resown in 1965. Trial 67C13 Location: Chapman Research Station An old land site, cleared in 1903. Sown to Dwalganup sub clover in 1964, topdressed each year until the start of the trial in 1967. In 1981 to 83 all plots were reseeded with Northam at 20 kg/ha. In 1988 rotations were altered to allow inclusion of grain lupins, the following changes were made: 1. The 4 plots of 2 crop :2 pasture were changed to 2 reps of wheat : lupins or lupins : wheat. 2. The 3 crop : 3 pasture had lupins included as the second crop, are now 3 pasture : wheat : lupins : wheat. Trial 67N4 Location: Newdegate Research Station An old land site, cleared in 1951 and in pasture (Dwalganup sub clover) from 1963 to 1967. All plots were sown to Nungarin sub clover, by 1982 all plots had been resown. In 1988 rotations were altered to allow inclusion of grain lupins, the following changes were made: 1. The 4 plots of 2 crop : 2 pasture were changed to 2 reps of wheat : lupins or lupins : wheat. 2. The 3 crop : 3 pasture had lupins included as the second crop, are now 3 pasture : wheat : lupins : wheat. Trial 68E5 Location: Esperance Downs Research Station Cleared in 1951 and sown to clover, cropped in 1961 and 1962 then Woogenellup sub clover and Brome grass were sown in 1963, topdressed until the start of the trial in 1968. Lupins were sown in trial in 1974. Esperance sub clover has been established on all plots. 65SG5 Location: Salmon Gum Research Station Cleared in 1962, then cropped until the start of the trial in 1968. Two of the four blocks were sown to Cyprus Barrel medic which was topdressed with superphosphate. The other two blocks regenerate volunteer pasture which was not topdressed. In 1984 all pasture plots were sown to SERENA medic. This grew exceptionally well in 1984 and set a lot of seed. In 1987 field peas were introduced into 4 reps of an existing medic : crop rotation. Trial 73SG16 Location: Salmon Gums The site was cropped in 1971 and 1972 after two years of volunteer pasture, mainly grasses and some wild legumes (Goldfields medic and wooly clover). In 1973 the trial started with pasture being sown to a mixture of Harbinger, Cyprus and Tornafield medics. The Harbinger quickly became the dominant species. In 1988 rotations changed with removal of a 2:2 system which is to be a second 1:3 medic but with control of grass in the pasture phase. Trial 88EB2 Location: East Beverley annexe The site in Paddock 1 was in sub.clover based pasture for the 3 years before the trial started