SciELO - Scientific Electronic Library Online

vol.39 issue5Expression of partial resistance to oat crown rust present in the lineage MN841801 submitted to the South Brazilian environmentWinter cereal crop development in Rio Grande do Sul, Brazil, throughout the temporal profiles of normalized difference vegetation index author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Ciência Rural

On-line version ISSN 1678-4596


MULLER, Liziany et al. Lower base temperature and seasonal production of diploid and tetraploid ryegrass genotypes. Cienc. Rural [online]. 2009, vol.39, n.5, pp.1343-1348.  Epub May 22, 2009. ISSN 1678-4596.

The objective of this study was to estimate lower base temperature Tb of three diploid (Comum, Fepagro São Gabriel, and LE 284 and two tetraploid (Avance and INIA Titán) ryegrass genotypes. With the estimated Tb, it was also possible to investigate if these genotypes may have seasonal production, which helps in programming herds feeding schedules. Five sowing dates (11/05, 07/06, 05/07, 09/08 e 01/09/2007) were performed in Santa Maria, RS, Brazil. Two methods were used to estimate Tb: least deviation method and relative development method. Tb values varied from 7.0 to 8.5°C for diploid genotypes and from 9.0 to 10.6°C for tetraploid genotypes, depending upon the method. Diploid ryegrass germoplasm have no risk of seasonal decrease in forage production, whereas tetraploids, mainly Avance, may have their growth and development decreased from June to August in Santa Maria because of minimum air temperature.

Keywords : growth; development; Lolim multiflorum; productivity; threshold temperature.

        · 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