The chemical control of wild radish

Wild radish (Raphanus raphanistrum) and wild turnip (Brassica Tournefortii) occur over a very wide area in Western Australia and are two of the most troublesome weeds of cereal crops. In a period of three years the area sprayed with hormone-like weed-killers for the control of these weeds has increased from experimental proportions to an estimated total of 400,000 acres in one season

Some chemical trials with doublegee

There is no more troublesome weed in Western Australia than doublegee. Besides its competitive and smothering: effect on crop and pasture, the spiny fruits penetrate the hoofs of stock causing: lameness. It is a quick-growing- annual which forms seeds at an early stage of growth and rapidly develops a strong tap-root. Dormant seeds will continue to germinate for a number of years and a succession of germinations often occur in the one season. The seedlings are capable of surviving adverse conditions and making rapid recovery

The effect of Hormone-like herbicides on Dwalganup subterranean clover

herbicides of the hormone-like group including,2,4-D and M.C.P.A. are now being used extensively in Western Australia for selective control of wild radish, wild turnip and mustard in cereal crops. It would be too much to expect however, that all crop and pasture plants are resistant to these chemicals and research into the tolerance of cultivated species is now being undertaken in a number of countries

The tolerance of subterranean clover (Trfolium subterranean L.) to chlorinated phenoxyacetic derivatives

The selective phytocidal properties of certain growth-regulating substances were confirmed when Slade, Templeman and Sexton (1945) found in 1940 that applications of 25 lb. naphthylacetic acid per acre to oats weedy with charlock (Brassica sinapis) killed the weed without causing permanent injury to the crop. Within two years of this work investigators in both England and America had recognised the strong growth-regulatory and herbicidal effects of chlorinated phenoxyacetic derivatives

A further chemical trial with doublegee (Emex Australis)

In the Journal of Agriculture, Vol. 3, No. 4, July-August, 1954, details were given of experimental work with doublegees and the following conclusions were reached:

The Transference Numbers and the Degree of Solvation of the Ions of Lithium Chloride in Certain Alcohols

The low migration velocities of some of the ions of the elements of low atomic weight, as well as the many other phenomena that are not explained by simple electrolytic dissociation, have led to the belief that the ion does not lead an independent existence in the solution, but is solvated, or combined chemically with one or more molecules of the solvent

How profitable are herbicides for weeds in crops?

BEFORE spending money on chemical weed control in crops, a farmer needs to know how profitable the operation will be. He may also be influenced by other things such as the need for weed-free seed, but the most important consideration should be an increased cash return. If a herbicide is used to control weeds in a crop, the extra yield achieved must be worth more than the cost of the herbicide and its application for the treatment to be profitable. This article gives guidelines to help farmers estimate the likely profitability of herbicide treatments for quota and non-quota crops

Development of laminar flow control wing surface porous structure

It was concluded that the chordwise air collection method, which actually combines chordwise and spanwise air collection, is the best of the designs conceived up to this time for full chord laminar flow control (LFC). Its shallower ducting improved structural efficiency of the main wing box resulting in a reduction in wing weight, and it provided continuous support of the chordwise panel joints, better matching of suction and clearing airflow requirements, and simplified duct to suction source minifolding. Laminar flow control on both the upper and lower surfaces was previously reduced to LFC suction on the upper surface only, back to 85 percent chord. The study concludes that, in addition to reduced wing area and other practical advantages, this system would be lighter because of the increase in effective structural wing thickness

Wind on the boundary for the Abelian sandpile model

We continue our investigation of the two-dimensional Abelian sandpile model in terms of a logarithmic conformal field theory with central charge c=-2, by introducing two new boundary conditions. These have two unusual features: they carry an intrinsic orientation, and, more strangely, they cannot be imposed uniformly on a whole boundary (like the edge of a cylinder). They lead to seven new boundary condition changing fields, some of them being in highest weight representations (weights -1/8, 0 and 3/8), some others belonging to indecomposable representations with rank 2 Jordan cells (lowest weights 0 and 1). Their fusion algebra appears to be in full agreement with the fusion rules conjectured by Gaberdiel and Kausch.Comment: 26 pages, 4 figure