Resumo

DIAZ-ZORITA, Martín; ARANGUREN, José MD; AGUILAR, Rodrigo  e  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.

Palavras-chave : Glycine max; Nitrogen Biological Fixation; Nodulation; Bradyrhizobium japonicum.

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