[Sunflower seeds yield and quality response to spacing and fertilizers]
1988
Hernandez Livera, A. | Carballo Carballo, A.
The mayor objectives of this study were to determine the effects of nitrogen (N), phosphorous (P), potasium (K) and plant population (PP) on seed yield and quality of three sunflower (Helianthus annuus L.) varieties, as well as to study the relationships between physical and biological seed characteristics. Yield of different seed sizes varied with PP but not with fertilization. Total seed yield showed a positive response to N and PP. The three varieties showed similar responses to N, P, K and PP. Three was no effect of fertilization factor and PP on biological quality of seed of intermediate size, as measured by per cent germination and seeding vigor. Seed size was a determinant factor for seedling vigor measured as postgermination dry weight production
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