Resumen

DIAZ-ZORITA, Martín; ARANGUREN, José MD; AGUILAR, Rodrigo  y  SATORRE, Emilio H. Phosphate fertilization and inoculation of soybean in vertisols. Cienc. suelo [online]. 2010, vol.28, n.2, pp.215-222. ISSN 1850-2067.

The symbiosis between rhizobia and soybean [Glycine max (L.) Merril] provides most of the nitrogen requirements of the crop through a process that also depends on the availability of nutrients, for example phosphorous. The objective of this study was to determine the contribution of P fertilization (0, 18 y 36 kg ha-1) and Bradyrhizobium japonicum inoculation on the nodulation and grain yield of soybean crops in Vertisols with low soil P availability. In the sites without previous soybean crops, the inoculation promoted a greater nodulation, and shoot dry matter and grain yields above the non-inoculated crops. Nodulation and shoot growth increased with increasing available P (P_soil + P_{fertilization}) levels up to 12.4 mg kg-1. In the sites rotated with soybean, yields were greater in the inoculated crops. Shoot dry matter and grain yields increased with increasing available P levels only under inoculation. In general, the inoculated and fertilized crops showed greater production suggesting the convenience of the combined nutrition of soybean crops for achieving greater grain yields.

Palabras clave : Glycine max; Nitrogen Biological Fixation; Nodulation; Bradyrhizobium japonicum.

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