Population density and application of nitrogen in the production of hybrid corn seed.
Keywords:agronomic management, seed yield, physical and physiological quality of seed.
The objective of this work was to evaluate the effect of population density and nitrogen fertilization on hybrid corn seed yield and quality. The experiment was conducted at the Instituto Nacional de Investigaciones Forestales, Agricolas y Pecuarias- Campo Experimental Bajío (INIFAP-CEBAJ) in the P-V cycle 2009. In the crosses CML 142 x CML 176, female parent of hybrid H-374C, three population densities (60, 75 and 90 000 plants/ ha) and three nitrogen levels (150, 250 and 350 kg/ha) were evaluated. In line CML 176, female parent of hybrid H-469C, population levels of 60, 80 and 100 thousand plants/ha and the same levels of nitrogen as the previous hybrid were evaluated. Agronomic traits, yield, components and the physical and physiological quality of seed were measured. In the crosses CML 142 x CML 176, the nitrogen had no significant effect on the characters evaluated. The population density significantly affected the yield, flowering and prolificacy index. In line CML 176, the population density also affected significantly the yield, flowering and prolificacy index and it also changed the diameter and length of pod and seed number per row. Other seed traits also modified by this factor were: useful percentage rates, large ball, and waste. The nitrogen presented statistical differences for the number of ears per plant, diameter and length of ear. The weight of a thousand seeds, the volumetric weight and vigor through the accelerated aging test were not modified by the effect of treatment in both evaluated genotypes.
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