ABSTRACT
EFFECT OF SEEDING DATE AND NITROGEN RATE ON A SPRING WHEAT CULTIVAR. I. YIELD AND YIELD COMPONENTS VARIATIONS

Nicasio Rodriguez S.1, Mario Mellado Z.2 y Carlos Rojas W.1
 

Wheat (Triticum aestivum L., cultivar Antufén) performance subjected to five seeding dates and seven N rates was evaluated by grain yields and yield components.
Interactions of both factors was used as a criteria to evaluate N efficiency in each seeding date studied.
Two field experiments on a trumao soil (Andasol) were conducted. A splitplot desing with 4 replications was used, including five seeding dates and seven N rates as treatments.
The correlation matrice used for grain yields and their components showed significance for all parameters. Spike number/m2 had the higher incidence on grain yield, followed by weight of 1.000 grains and grain number by spike.
Grain yield components varied independently; but they interacted significantly in their contribution to grain yield.
According with results obtained, in late seeding dates it is not possible to reach the maximum grain yield by increasing N rate.

Keywords:
1Ings. Agr., M. Sc., Recursos Ambientales, Estación Experimental Quilamapu, Instituto de Investigaciones Agropecuaria, Casilla 426, Chillán - Chile.
2Ing. Agr., M. Sc., Programa Vegetal, Estación Experimental Quilamapu, Instituto de Investigaciones Agropecuaria, Casilla 426, Chillán - Chile.