Dynamics of soil nitrogen and phosphorus in three land use systems on hillsides of Honduras

Acta Agronómica

García, Edwin³  Barrios, Edmundo²  Asakawa, Neuza³  Borrero, Gonzalo³  Castro, Aracely³  Rao, Idupulapati³  Menjívar, Juan Carlos¹ 

[1] Universidad Nacional de Colombia, Palmira, Colombia;World Agroforestry Centre, ICRAF, Nairobi, Kenya;Centro Internacional de Agricultura Tropical, CIAT, Cali, Colombia

关键词: Quesungual Agroforestry System;    slash-and-burn;    secondary forests;    maize;    common bean IntroducciónEl Sistema Agroforestal Quesungual (SAQ) es un sistema de producción para agricultores de pequeña escala que incluye un grupo de tecnologías para el manejo sostenible de los recursos vegetación;    suelo y agua en agroecosistemas de ladera con tendencia a sequía en el trópico sub-húmedo (CIAT;    2009);   

DOI  :  

学科分类：农业科学（综合）

来源: Universidad Nacional de Colombia * Facultad de Ciencias Agropecuarias Palmira

【 摘 要 】

A study was carried out to determine the effect of management principles in the Quesungual Slash and Mulch Agroforestry System (QSMAS) on the dynamics of soil nitrogen (N) and phosphorus (P), and their impact on QSMAS´ productivity in southwestern Honduras, Central America. Five land use systems were compared: (1) Slash-and-burn traditional system; (2, 3 and 4) QSMAS of <2, 5-7 and >10 years old, respectively; and (5) Secondary forest. Local practices were applied to produce maize Zea mays, and bean Phaseolus vulgaris, with (101 kg N + 55 kg P /ha for maize, 46 kg N + 51 kg P /ha for bean) and without addition of fertilizers. Measurements included decomposition and nutrient release from biomass, aerobic mineralization of N, sequential fractionation of P, size-density fractionation of soil organic matter, and crop yield. Similarities in N dynamics indicate that QSMAS and slash-and-burn system were equally effective in providing N, although in QSMAS it is also result of a biologically mediated process. P pools in QSMAS were more dynamic and favorable by reducing their flows towards unavailable forms. Based on nutrient availability and grain yields over time, QSMAS could be a suitable option to replace the slash-and-burn system in smallholder agroecosystems.

【 授权许可】

CC BY-NC-SA