En una plantación de Pijuayo (Bactris gasipaes H.B.K.) de cuatro años de edad se sembró una leguminosa forrajera centrosema (Centrosema macrocarpum Benth.) como cobertura del suelo, con niveles crecientes de Fósforo (P) con el fin de encontrar la dosis adecuada que permita lograr un rápido establecimiento de la cobertura, para su posterior utilización como un sistema silvopastoril.Cuatro niveles de P fueron probados: 0, 20, 40 y 80 Kg/ha usando roca fosfórica como fuente de P. Estas dosis se aplicaron al voleo, antes de la siembra de la cobertura, al inicio del experimento. La respuesta a las dosis de P se midió con el diseño de Bloques Completamente Randomizados (BCR).Los niveles iniciales de P en el suelo fueron bajos, incrementándose significativamente en función a las dosis crecientes de P. Similar tendencia se observó en la concentración de P tanto en los tejid...

Secondary forests and coffee cultivation systems with shade trees might have great potential for carbon sequestration as a means of climate change adaptation and mitigation. This study aimed to measure carbon stocks in coffee plantations under different managements and secondary forest systems in the Peruvian Amazon rainforest (San Martín Region). The carbon stock in secondary forest trees was estimated using allometric equations, while carbon stocks in soil, herbaceous biomass, and leaf litter were determined through sampling and laboratory analysis. The biomass carbon stock in secondary forests was 132.2 t/ha, while in coffee plantations with Inga sp. shade trees it was 118.2 t/ha. Carbon stocks were 76.5 t/ha in coffee with polyculture farming, and the lowest amount of carbon was found in coffee without shade trees (31.1 t/ha). The carbon sequestered by coffee plants in all agrofores...

The Peruvian Amazon has been significantly affected by land use and climate change, decreasing decomposition processes, which cause a significant depletion of soil C stocks. In this study, we estimated soil organic C (SOC) mediated by different plant covers in coffee (Coffea arabica L.) plantations and secondary forests in several districts of the San Martín Region, Peru. We calculated the critical threshold, saturation point, and the organic C deficit of these Amazonian soils. The association between geography, soil physical-chemical characteristics, and SOC was estimated through principal component analysis. Across all sites of the study, SOC stock had an average value of 69.19 t ha-1, with 48.95 t ha-1 constituting inorganic C. The highest SOC stock (225.28 t ha-1) was observed under secondary forest in the Jepelacio district. The SOC stocks were positively correlated with altitude a...