SciELO - Scientific Electronic Library Online

vol.29 issue3Effect of corn and Panicum maximum intercropping on weed and soybean crop in rotationPhyto-sociological evaluation of the weed community in areas in transition to organic coffee author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Planta Daninha

Print version ISSN 0100-8358


PAULA, J.M et al. Competition of wheat with ryegrass as a function of application times and nitrogen doses. Planta daninha [online]. 2011, vol.29, n.3, pp.557-563. ISSN 0100-8358.

Wheat productivity potential is limited by competition with weeds, especially considering light, water, and nutrient resources. The objective of this work was to evaluate morphological variables and productivity components in wheat in competition with ryegrass, considering application times and N doses. The first factor evaluated was the competition condition (absence and presence of ryegrass); the second factor was N application times (100% applied at the beginning of tillering; 50% applied at the beginning of tillering and 50% at the beginning of spike differentiation [BSD]; and 100% at BSD); and the third factor was N doses (0, 40, 80, 120 and 160 kg ha-1). The variables evaluated were: leaf area (LA), aerial part dry mass (APDM), number of tillers ( NT), number or stems (NS), N content in the culture(CN), number of grain per spikelet (NGPS), spike grain number (SGN), number of grains per spike (NGS), biological productivity (BP), average weight of 1000 grains (AWG) and grain productivity (P). The results showed that ryegrass competes with wheat for nitrogen reducing FA, APDM, NT, NT, NS, NGPS, CEGN, BP, AWG and P of the culture. N application at the beginning of tillering or fractionated, at the two highest doses, increases FA and MSPA. N dose increase accelerates CN in wheat culture, independent of the presence or absence of the competitor. N application in BSD or increased N dose increase NSPS and SGN.

Keywords : Triticum aestivum; Lolium multiforum; weeds; interference.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License