Pasture cultivar comparison on red loam soil - large plots.

Trial 88GE34 Locations : North Mullewa Research Station and Morawa Agricultural School. Evaluation of pasture cultivars in large plots

Effect of deep ripping and aphid infestation on pasture production.

Trial 88EC18 Location: East Chapman Research Station. Half the trial site was cultivated to 30cm at the break of the season and the whole site was normally cultivated. Weeds were then sprayed with Roundup at 1 1/ha prior to seeding with an eight run cone seeder. The plots were kept weed free during the year by hand weeding. The root distribution was calculated from soil cores taken in 20 cm increments on 20 August. Aphid cortrol consisted of spraying every two weeks with Pirimor at 140 g/ha between July and October. Lorsban at 150 ml/ha was used for the last two sprays, which appeared to have some affect on the pasture growth and may have compounded the results slightly. Both cultivars displayed an early response to deep ripping, however this response had faded out by 8 weeks after germination and had no effect on seed yield. Blue-green aphids were at the highest numbers between 8 and 11 weeks, and had virtually disappeared by 13 weeks

Serradella establishment on light textured soil.

Trial 87GE81 Location: East Chapman Research Station. Evaluate early maturing serradella lines on deep sands

Pasture cultivar comparison on acid wodjil soil - large plots.

Trial 88TS64 Location: Latham To evaluate the effect of various legume pasture cultivars on pasture production on acid wodjil soils

Pasture cultivar comparison - large plots.

Trial 88TS63 Location: Perenjori To evaluate the effect of various legume pasture cultivars on pasture and crop production

Annual medic evaluation on Eradu sandplain soil - plots

Trial 88EC17 Location: East Chapman Research Station. The plots were hand sown at 2 g/m2 of inoculated and lime pelleted seed. The medics were inoculated with WSM540 which may have been ineffective on some of the M. littoralis and M. tornata varieties. The time taken to form ripe pods was monitored to gain some extra measure of maturity besides flowering time for comparing wide ranges of species. The ripening time involved was very similar over all the varieties, averaging out to 44 days after the flower opens. What appears to be a more important factor when considering maturity is the rate of flower and pod development, which appears the most rapid in M. tornata and M. polymorpha

Random set theory and problems of modeling

The three- or four-dimensional world in which we live is full of objects to be measured and summarized. Very often a parsimonious finite collection of measurements is enough for scientific investigation into an object’s genesis and evolution. There is a growing need, however, to describe and model objects through their form as well as their size. The purpose of this article is to show the potentials and limitations of a probabilistic and statistical approach. Collections of objects (the data) are assimilated to a random set (the model), whose parameters provide description and/or explanation

On The Performance Characteristics Of Electron Ring accelerators

On the basis of our present understanding of the physical phenomena involved in an electron ring accelerator (ERA), a theoretical study is made of the performance which might be expected for an ERA. Rigorous upper bounds are obtained on the rate of energy gain, from which it is shown that, in order to prevent azimuthal instability, parameters must be selected such that (for reasonable fields, injector properties, etc., but with no safety factors) the proton energy gain is less than 80 MeV/m. Numerical examples and approximate formulas are given for the properties of rings satisfying the stability conditions for both azimuthal oscillations and ion-electron oscillations. It is found that for reasonable fields and injector properties, but without safety factors, the useable proton energy gain is less than 45 MeV/m