Influence of herbicides application methods on weed control effectiveness: first results

Balsari, P.; Ferrero, A.; Airoldi, G.; Tamagnone, M.

Mededelingen van de Faculteit Landbouwwetenschappen - Rijksuniversiteit Gent 58(3A): 809-817

1993


ISSN/ISBN: 0368-9697
Accession: 002410137

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Abstract
Field trials were conducted in a typical Italian maize and soyabean growing area during 1992 to investigate the influence of herbicide application methods on weed control efficacy. A hybrid variety of maize (FAO class 600) was sown in the 1st week of May on a muddy soil at a density of 6.5 seeds/msuperscript 2, and different vol. of herbicide (250 and 500 litres/ha) and uniformity of distribution were tested. Soyabean trials were carried out on a loam soil in which the crop was sown in late Apr. at a density of 48 seeds; various different types of spray nozzle (hollow, cone, flat fan and spinning disc), vol. (25-300 litres) and rates of herbicide (75-100%) were tested. In both trials herbicides were applied pre- and post-em. The results of the maize trials indicated that when herbicides were applied pre-em. application vol. had little effect, whereas with post-em. applications the best results were achieved at lower vol. (250 litres). In both the pre- and post-em. trials, yields appeared to be directly related to distribution uniformity. The soyabean trial with the various spray nozzles showed that fan nozzles gave the greatest weed control and greatest yields for all the variables tested (vol. and application rates of herbicides), and the cone and spinning disc nozzles were next best, resulting in yields approx. 30% lower. These results indicate that, with the use of fan nozzles, it is possible to reduce the application rate by 25% and the application vol. by 50% without affecting the efficacy of herbicides.