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The MM1 site has determined the long term effect of superphosphate on wheat yield response in the Mallee and scientific publications arising from this site are listed below.
The MM1 site is also used regularly as a resource for post graduate students and agricultural researchers within collaborative projects, where it provides a known history of fertiliser management and rotation treatment.
Plots at the MM1 site at Walpeup are 3.5 metres wide by 30 metres long. Testing rates are 0, 35, 67, 101, and 135 kg of phosphorus per hectare as single superphosphate. The original purpose was to test long term effect of superphosphate on wheat (cv.
Insignia) growth, yet some variations from the original design occurred between 1943 to 1959, with a three year rotation (fallow-wheat-oats) used across three paddocks, with one paddock in wheat phase each year.
From 1960 to 2010 a two year rotation (fallow - wheat) was used at two of the original three paddocks, with only one paddock sown each year.
From 1959 to 1970 plots were halved lengthwise to test top-dressing with nitrogen. From 1985 to 1987 plots were halved width wise to test under sowing of medic (cv.
Since 1987, subplot treatments have been abandoned, although subplot divisions still exist on the ground and are shown on the figure below as dotted lines.
From 1943 to the present, grain yield and climate data has been recorded. In 1976, 1977, 1990, 1997 and 2007 grain protein was measured and in 1997 and 2005 soil phosphorus was measured. One thousand grain weight and screenings were completed in 2006. Soil nitrogen, phosphorus and potassium was measured over 17 years between 1959 and 2005. No soil moisture data is available.
McClelland VF (1968) Superphosphate on wheat: the cumulative effect of repeated applications on yield response. Australian Journal of Agricultural Research 19
Latta RA, Mock I, Smith J (2008) The effect of repeated application of phosphorous fertiliser on wheat yields in the Mallee. Australian Journal of Agricultural Research 59
Vu DT, Tang C, Armstrong RD (2008) Changes and availability of phosphate fractions following 65 years of P application to a calcareous soil in a Mediterranean climate. Plant & Soil 304