Resumo

CHURA, Julián; MENDOZA-CORTEZ, Juan Waldir  e  DE LA CRUZ, José Carlos. Doses and splitting of nitrogen in two sowing densities of the flint yellow maize hybrid. Scientia Agropecuaria [online]. 2019, vol.10, n.2, pp.241-248. ISSN 2077-9917.  http://dx.doi.org/10.17268/sci.agropecu.2019.02.09.

An experiment was conducted in La Molina, Lima, Peru, with the objective of evaluate the effect of planting densities (62 500 and 69 444 plants ha-1), nitrogen doses (180, 200 and 220 kg ha-1) and nitrogen splitting (two times: stages V3 (50%) and V7 (50%); and three times: stages V3 (20%), V7 (40%) and V12 (40%)), on the agronomic performance of the flint yellow corn hybrid EXP -05. The experiment used a completely random block design, in 2x3x2 factorial arrangement, with four replications. There was not significant effect of the interactions of the evaluated factors on growth and yield components. On the other hand, there was an individual effect of nitrogen doses and planting density on grain yield and stem diameter, respectively. The highest grain yield (10.639 t ha-1) was obtained with 200 kg ha-1 of N and the largest stem diameter (2.42 cm) with the lowest planting density (62 500 plant s ha-1). Although the interaction of the evaluated factors was not significant, the highest grain yield (10.939 t ha-1) was obtained with 200 kg ha-1 of N, splitting in two stages which are V3 (50%) and V7 (50%) and using 69 444 plants ha-1.

Palavras-chave : Population density; nitrogen fertilization; yield; Zea mays L.

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