Resumo

MAGANA VALENZUELA, Wanderley et al. Comparative yield of cassava under mineral fertilization and green manure. Rev. Mex. Cienc. Agríc [online]. 2020, vol.11, n.6, pp.1259-1271.  Epub 11-Out-2021. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v11i6.2202.

The use of legumes as green manures in agri-food crops is a cultural practice that reduces the excessive use of fertilizers, improves fertility and reduces soil erosion. The crotalaria (Crotalaria juncea L.) is a legume that is used as green manure due to its rapid growth and nitrogen contribution to the soil. The objective of the study was to evaluate the effect of the legume Crotalaria juncea L. as green manure on cassava yield and soil fertility at different plantation densities. The experiment was carried out from September 2018 to April 2019 in the Experimental Field of the Postgraduate College-Tabasco Campus. A completely randomized experimental design with a 2 x 2 factorial arrangement was applied, the statistical analyzes were performed in the Statistic program, 2003. The yield of cassava tuberous roots did not show significant differences due to the effect of green manure and the density of plantation, on average the yields in dry and fresh weight were 4.44 and 13.26 t ha-1, respectively. Cassava with a density of 10 375 plants ha-1 presented the highest leaf yields (1.23 t ha-1). Regarding the fertility of the soil, there was no significant difference between the treatments, the OM of the soil was not affected by the presence of C. juncea and the contents of N, P and K in the soil were 0.27%, 8.25 mg kg-1 and 0.32 cmol kg-1 respectively, which presented tendencies to increase due to the effect of green manure (C. juncea).

Palavras-chave : Crotalaria juncea L.; legume; plantation density.

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