Proceerlings of The South African Sugar Technologiss….pdfVIP

Proceerlings of The South African Sugar Technologis/s Association -June 1970 THE RESULTS OF PRE-EMERGENCE HERBICIDE SCREENING TRIALS FOR SUGARCANE IN NATAL By F. E. RICHARDSON South African Sugar Association Experiment Station Abstract Materials and Methods The results of seven pre-emergence herbicide The experiments are described and discussed indi- screening trials involving 27 chemicals are presented. vidually but the techniques of herbicide application The experiments, which were conducted over a four- and assessment were common to all experiments. Full year period, differed with respect to soil moisture cover herbicide treatments were applied using a conditions, soil type and prevailing weed flora. Platz Frankonia knapsack fitted with a Spraying Special attention was directed to the control of Systems T.K.2.5 floodjat and a constant pressure Cyperus esculentus, C. rotundus and grasses. Mean valve. The ,pace of the operator was maintained so visual assessmenlts of control of species or species- that approximately 280 litres per hectare were de- group are presented for each experiment. Two chemi- livered at a pressure of 2.1 kg/cm with the floodjet cals, C.P.50144 (Alachlor) and C.P.44939 gave con- held 50 cm above (theground. sistently good results. C.P.50144 had a wide spec- Visual scorings of weed