Revista Brasileira De Herbicidas 2013; 12(2): 124-130
Coexistence periods between wheat crop and weeds combined with growth regulator
The use of growth regulators in wheat crop is a usual practice, and one of its effects is the changing in plants architecture, what may interfere in the early season for weeds control. With the objective of evaluating the influence of growth regulator (trinexapac-ethyl) effect over agronomic characteristics and wheat yield, in order to determining the best period to initiating weeds control in wheat crop, an experiment was conducted in Ponta Grossa County, Parana State in 2011 agricultural year. Experimental design used was randomized complete blocks, in factorial scheme 2 x 10, represented by two treatments with or without growth regulators and 10 coexistence periods between weeds and wheat crop Quartzo genotype. The ideal period for initiating weeds control, avoiding yield reduce was up to 25 days after emergence (DAE), independent or no of trinexapac-ethyl use as growth regulator, that decreased plant height, leaves length and leaf area index, but without interfering over yield and weeds control period.
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