ABSTRACT


VITAL VALDIVIA B.1 Y CARLOS MADARIAGA L.1
 
Effect of planting dates on seed yield and agronomic characters of three varieties of saybeans was studied at Santiago under irrigation conditions, during 1964-65 and 1965-66.Planting dates had significant effect in seed yields. Earlier variety Traverse gave lowest yield with the earliest and latest plantings. The average seed yield for the early variety Chippewa was highest when seeded in October and November and decreased rapidly with later planting. Clark, a late variety, was more affected by late planting and the yields decreased after October 15 planting.
The period from planting to maturity decreased with delay in planting up to November 30 planting, but this was not consistent for the different varieties and years. In 1964-65 the earliest varieties Traverse and Chippewa were delayed 18 days and the late variety 11 days for a 76-day delay in planting. In 1965-66, under conditions of lower temperature in the fall, there was an extreme delay in maturity in the last planting date. In the Northern-Central region early varieties might be planted in October and November, and late varieties like Clark should not be planted after October.
Keywords:
1 Ingeniero Agrónomo M. S. e Ingeniero Agrónomo, respectivamente. Proyecto Oleaginosas. Estación Experimental La Platina. Instituto de Investigaciones Agropecuarias.