Nitrogen mineralization in soils cultivated with plantain (Musa AAB Subgroup plátano cv. Hartón), Zulia state, Venezuela

• Ana Francisca González-Pedraza Universidad de Pamplona. Facultad de Ciencias Agrarias. Programa de Ingeniería Agronómica. Campus Universitario, km 1 carretera vía a Bucaramanga. Pamplona, Norte de Santander, Colombia. Código Postal: 5430 Universidad Nacional Experimental Sur del Lago “Jesús María Semrpum” (UNESUR). Programa Ingeniería de la Producción Agropecuaria. Campus Universitario Hacienda La Glorieta. Santa Bárbara, municipio Colón, estado Zulia, Venezuela. Código Postal: 5148 https://orcid.org/0000-0002-4392-3724
• Juan Carlos Escalante Universidad de Pamplona. Facultad de Ciencias Agrarias. Programa de Ingeniería Agronómica. Campus Universitario, km 1 carretera vía a Bucaramanga. Pamplona, Norte de Santander, Colombia. Código Postal: 54304 https://orcid.org/0000-0003-0754-0774

Keywords: Ammonia, nitrate, incubation, soils, plant vigor

Abstract

The main source of N in the soil is organic matter; therefore, its availability depends on its quantity and quality, microbial activity, soil characteristics and management. An efficient way to quantify available N is by mineralizing it as ammonium (N-NH) and nitrate (N-NO). Therefore, in this study, the total and available N was determined in soil samples 0-20 cm deep from two plots with plantain plants (Musa AAB plantain subgroup cv. Hartón) with high and low vigor (AV and BV, respectively), in the South of Lake Maracaibo. Total N was determined by the Kjeldalh method and the mineralization of available N by incubation under laboratory conditions for 10 weeks. The accumulated mineralized N (Nm), the constant mineralization rate of (k) and the potentially mineralizable N (N0) were calculated. A one-way analysis of variance was applied, when it was significant (p<0.05), a Tukey test was applied for multiple comparisons of means. Total N was low (<0.025 %) and did not present statistical differences (p<0.05) between AV and BV. The accumulated mineralized N-NO was statistically (p<0.05) higher (524.47 mg.kg^-1) in BV, while the N-NH did not present differences between AV and BV. Only k was statistically higher (0.07 ± 0.03; p<0.05) in BV. Nitrification was the process that prevailed especially in BV where organic carbon was higher and presented a higher percentage of sand.

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