Resumo

ROMERO ROMANO, Carlos Osvaldo et al. Organic-mineral fertilization of amaranth (Amaranthus hypochondriacus L.). Rev. Mex. Cienc. Agríc [online]. 2017, vol.8, n.8, pp.1759-1771. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v8i8.700.

The objective of this research was to evaluate the effect of different doses of organic-mineral fertilization on grain yield and height of amaranth plant; in addition, to determine if there is any correlation between plant densities and yield. The experimental design used was completely randomized blocks with four replicates. The experiment was conducted under the traditional system of direct sowing during cropping cycles (2014-2015). The treatments were obtained through the Plan Puebla I matrix, the factors and study levels were: nitrogen (20, 40, 80 and 100 kg ha -1 ), phosphorus (0, 20, 40 and 60 kg ha -1 ) and composed of bovine manure (0.5, 1, 2 and 3 t ha -1 ), adding 40 kg ha -1 of potassium to the treatments and the control (00-00-00-00). The variables evaluated were grain yield per m2, yield per plant and plant height. The number of plants per experimental unit was also counted at the time of panicle cut in order to correlate plant density and yield. Statistically significant differences (Tukey, p< 0.05) were found in plant height, yield per plant and yield per m2; in both performance variables the best treatment was 80-20-00 kg ha -1 of N-P-K plus one ton of compost. A significant negative correlation (r= -0.38982; Pearson, p< 0.05) was found between the number of plants and plant height; and between plant numbers and yield per plant (r2= -0.73993; Pearson, p< 0.05).

Palavras-chave : compost; plant density; plant height; yield; traditional planting system.