Efficiency of Substituted Urea Herbicides as Influenced by Surfactants and their Influence on Wheat Quality and Uptake of Nutrients1
Abstract
Field studies were conducted in the Punjab Agricultural University, Ludhiana during 1980–81 and 1981–82 to explore the feasibility of reducing the dose of isoproturon when applied in conjunction with adjuvants (surfactants) i.e. sandovit and hyoxid, for control of Philarisminor Ketz. in wheat Two years, data showed that there is a scope for reducing the dose of these herbindes by 20 per cent when applied in combination with either of these" two surfactants without any loss In the biorfficacy of these herbicides for control of Phalaits. These surfactants were compatible with isoproturon and metoxuron and lower dose, of isoproturon (0.75 kg/ha) + 0.1% sandovit or 0.25% hyoxid or metoxuron (1.2 kg'ha) + surfactant resulted in similar level of control of this grass weed and grain yield as attained in case of isoproturon/metoxuron alone at higher rate i.e. 0.94 and 1.5 kg/ha, respectively. However, these surfaciants were incompatible with methabenzthiazuron in which case its amplication with sandovii/hyoxid induced toxicity on the crop with consequent significant reduction in the grain yield compared with methabenzthiazuron alone at its higher dose (1.3 kg/hi).
