Researches regarding weed control in soybean crop

Abstract

Soybean shows special sensitivity to weeding while in the early growth stages until the land is covered, but also in the mature stages after the leaves begin to fall. Once invaded by weeds, especially in the first phase of growth, the culture is no longer recovering even if later, weeds are controlled. The purpose of presented paper is to identify an integrated weed control system for the soybean crop, starting from: (i) requirements of the soybean crop towards environmental and technological factors so that it can effectively compete with weeds; (ii) reporting the weed control strategy to new climatic conditions through specific measures of adaptation; (iii) strategies research of chemical complementary herbicides regarding their combat range and time of application. In order to maintain soybean cultures clean of weeds, it is necessary, in general, to apply two chemical treatments, the first ppi/pre-emergent spraying for some annual dicotyledonous and monocotyledonous weeds and the 2nd post-emergence treatment for dicotyledonous weeds. If on vegetation exists infestations both with annual or perennial monocotyledonous weeds, good results are obtained by associating two complementary herbicides, which combat both monocotyledonous and dicotyledonous weeds. The lowest degree of weed (7.5 weed/m2) was determined with the combination: Frontier Forte & Surdone & Pulsar & Stratos Ultra.