ESTABLISHMENT AND ACTIVITY OF INTRODUCED Rhizobium AND Azospirillum DURING THE FIRST YEAR OF TEPETATE SOIL PLOWING

Tepetate soil is characterized by the presence of very low levels of organic matter, nitrogen and phosphorus; its incorporation into agricultural production requires a high external energy input. This study was conducted in order to evaluate the establishment and activity of introduced Rhizobium and Azospirillum during the first year of tepetate plowing at Tlalpan, Tlaxcala. It involved the use of intercropped maize (Zea mays L.)- bean (Phaseolus vulgaris L.)- broadbean (Vicia faba L.), with or without inoculation, and inoculated vetch (Vicia villosa Roth) used as a crop for rotation, both with or without cow manure incorporation (40 t ha-1) using a split-plot arrangement in randomized complete blocks with four replications. The R. Ieguminosarum bv. phaseoli and Azospirillum populations in the rhizospheres of bean and maize averaged 5.13 x 104 and 2.01 x 104 colony forming units g-1 of soil, respectively, 50 days after sowing but declined later. R. Ieguminosarum bv. phaseoli occupied 9 and 7% of bean nodules and Azospirillum infected 7 and 20% of maize roots in tepetate with or without manure incorporation, respectively. The inoculation of Rhizobium spp. and Azospirillum did not have a significant effect on the production of intercrop dry matter, although the manure incorporation improved the intercrop grain yield and the dry matter production of the inoculated vetch.

Bibliographic Details

Main Authors:	Alvarez-Solís, José David, Ferrera-Cerrato, Ronald, Santizo-Rincón, José A., Zebrowski, Claude
Format:	Digital revista
Language:	spa
Published:	Colegio de Postgraduados 1996
Online Access:	https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1359
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