EFECTO DE LA EPOCA DE SIEMBRA SOBRE EL RENDIMIENTO Y CONTENIDO DE PROTEINA EN TRIGOS DE PRIMAVERA

Abstract

The influence of four dates of planting spring wheat (september 5th, 21st, october 7th and 23rd) was measured with varieties Pumafen, Panguifen, Intermedio and Flecha, in Valdivia, Chile. The different varieties were, similar although, as an average, the total yield was affected by the date of planting from 3,14 to 2,34 grams per plant. Pumafen, Panguifen and Flecha which averaged over 12 percent protein, were significantly superior to Intermedio with 10,8 percent. This percentage of protein appeared since september 5 until oct. 23 to increase from 11,2 to 12,6 percent. An opposite relationship between yield and protein, non significant, was observed. Only 55 percent of variation of the protein values could be assigned to variation in yield. The significant values, indicating lowering yields in later states of planting, did not make wise to delay the sowing date as a mean of improving the protein content without economical losses.