Polish Journal of Agronomy 01

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Possibilities of weed control in spring cereals by herbicides applied at reduced rates
(Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy w Puławach, 2009-03-31) Krzysztof Domaradzki; Renata Kieloch
In the European countries leading in agricultural production like Great Britain, France, Germany and the Scandinavian , in the last several years, the tendency to use pesticides more rationally is observed. The tendency to reduce the use of pesticides is connected with the policy of the governments of the European Union countries. In the years 2003–2006 the evaluation of herbicides’ efficacy used at different rates for weed control in spring wheat and spring barley was tested. Each of tested herbicides was used at four rates – full recommended (100%) and at three lowered (75%; 50% and 25%). The best results of weeds control in spring cereals gave tribenuron methyl plus an adjuvant which excellent reduced fresh mass of weeds even it was used at 25% of recommended rate. The same effect was observed after application half of recommended rate mixtures 2,4-D + fl orasulam, amidosulfuron+iodosulfuron, amidosulfuron+metribusin and 2,4-D + fl uroxypyr. The similar results were occurred after application of MCPA + fl uroxypyr at 75% recommended rate. Application of herbicides at rates reduced by 25% to 75% to recommended rate had not signifi cant impact on grain yield of spring barely and spring wheat.