Grains and field crops
New land sites, Old land sites
At five out of the seven sites, there was a decline in plant
numbers per metre drill row with increasing super rates. At
one site (72TS9), the fall in density fitted a linear equation
of 1 plant/metre reduction with an increase of 450 kg super/ha.
This pattern could be the result of high fertilizer concentration
in the location of the seed and rhizobia, with drilling high rates
of superphosphate. The only two sites not to show this reduction
in plant numbers (72AL9 and 72GE10) had the two highest rates of
super treatments omitted.
The higher seeding rates to be used in the 1973 trials should
overcome any influence of reduced lupin density on yield. 72AL9, 72BR11, 72ES7, 72ES8, 72GE9, 72GE10, 72NA9, 72TS9,
Number of Pages
Walton, G H. (1972), Part 2 Lupin cultivar - response to superphosphate application. Department of Agriculture and Food, Western Australia, Perth. Report.