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Journal of soil science and plant nutrition

versión On-line ISSN 0718-9516

Resumen

CECILIO FILHO, A. B et al. Nitrogen and potassium application by fertigation at different watermelon planting densities. J. Soil Sci. Plant Nutr. [online]. 2015, vol.15, n.4, pp.928-937.  Epub 18-Oct-2015. ISSN 0718-9516.  http://dx.doi.org/10.4067/S0718-95162015005000064.

The effects on the production of ,Top Gun, watermelons were evaluated at N and K (N+K2O) doses via fertigation of 79.8+106.7, 106.4+142.2, 133.0+177.7, and 159.6+213.2 kg ha-1 and at plant spacings of 0.5, 1.0, 1.5, and 2.0 m. The experiment had a split-plot randomised block design with three replicates. N+K2O doses and plant spacings were randomised in the plots and subplots, respectively. We evaluated foliar N and K contents, average mass of commercial fruits (MF), total (FT) and commercial (FC) number of fruits, and total (PT) and commercial (PC) productivity of weight classes 6-8, 8-10, 10-12, and >12 kg per area and plant. The N+K2O doses only influenced the foliar K content. The other variables were not influenced by the interaction of factors or by the N+K2O doses. Plant spacing influenced fruit number and production. Reducing plant spacing from 2.0 to 0.5 m decreased MF, FT, FC, PT, and PC of the classes per plant but increased FT, FC, PT, and PC of the 6-8 and 8-10 kg classes per area.

Palabras clave : mineral nutrition; plant spacing.

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