INTRODUTION

A high density of shade trees and the varieties with high coffee quali-

ty cup, characterizes the coffee agroforestry systems in Mexico.

However, in the last decade it has been affected by the leaf rust

(Hemileia vastatrix), trade problems and low prices which led produc-

ers to change their varieties, reducing the shade of density and the

application of inorganic inputs. These decisions that affect the type

and quality of organic matter as well as the microbial activity2 gener-

ating variations in CO2 emissions.

OBJETIVE

The objective of this research was to show the side effect of the deci-

sions made by the producers to adapt to the issue of the CO2 emis-

sion generated by the soil microfauna (SM).

METHODOLOGE

The study was carried out in Tlaxopla, Veracruz, in three farms, each

with distinct decisions adopted by farmers, as follows:

1) Renovated by using tolerant varieties to coffee leaf rust;

Figure 1. Farm renovated with tolerant varieties to coffee leaf rust

2) Managed with pruning and leaf rust control with the application of

inorganic fertilizers;

Three soil samples were taken in each farm per depth of 0-10; 10-

20; 20-30 cm, and the microbial activity was evaluated through the

CO2 content emitted by the SM.

RESULTS

The results showed on the average the farm (1) emitted a higher

concentration of CO2 on the three depths (1.5; 1.4; 1.4 mgCO2.Kg-

1soil.day

-1). However the emission ranges of the microbial respiration

in the renovated farm are similar to those of the traditional farm.

Figure 4. Tukey test for the CO2 content emitted by the soil microfauna, by type of farm

and depth. 1:1: farm I: depth 0-10 cm; 1:2: farm I: depth 10-20 cm; 1:3: farm I: depth 20-30

cm; 2:1: farm II: depth 0-10 cm; 1:2: farm II: depth 10-20 cm; 1:3: farm II: depth 20-30 cm;

1:1: farm III: depth 0-10 cm; 1:2: farm III: depth 10-20 cm; 1:3: farm III: depth 20-30 cm.

The different letters indicate that there is a significant difference between the means. Sig-

nificance of 0.05. Type I error .

Figure 2. Farm management with pruning and leaf rust control with the application of inor-

ganic fertilizers .

3) A farm with traditional management.

CONLUSIONS

In conclusion, the decision to renew with tolerant varieties to coffee

leaf rust enriched the soil microfauna3 with higher rate of CO2 emis-

sions than the other two decisions adopted by the farmers.

LITERATURE

1. Durango, W., Uribe, L., Henríquez, C., & Mata, R. (2015). Respi-ración, biomasa microbiana y actividad fosfatasa del suelo en dos agroecosistemas y un bosque en Turrialba, Costa Rica. Agronomía costarricense. 2. Bolaños, N. C., Fernández, A. C. T., Soto, G., & Virginio Filho, E. D. M. (2012). Efecto de diferentes sistemas de manejo sobre la ca-lidad del suelo, en fincas cafetaleras de la zona de Turrialba y Oro-si. Intersedes, 13(26). 3. Paolini G., J. E. (2018). Actividad microbiológica y biomasa mi-crobiana en suelos cafetaleros de los Andes venezolanos. Terra Latinoamericana, 36(1), 13-22 p.

Figure 3. Farm with traditional management.

Variation of soil microbial emissions of CO2 in coffee agroforestry systems in Veracruz,

México.

Ayala D.1 (diayalamontejo@gmail.com), Ramírez I.

1, Valdés E.

1, Alegre J.

2, Cruz J.

3, Pérez E.

3, Quispe G.

4

1Fitotecnia Department, Universidad Autónoma Chapingo, México, México, México

2Soil Science Department, Universidad Nacional Agraria La Molina, Lima, Lima, Perú

3Agroecology Department, Universidad Autónoma Chapingo, México, México, México

4DyG Solución Bio-organica S.A.C., Lima, Lima, Perú

Diana Ayala Montejo is student the Ph. D. in Sciencie in Agriculture Multifuntional for Sustainable Development of the Chapingo Autonomous University - Mexico. Her research is on carbon and nitrogen dynam-ics in coffee agroforestry systems in Mexico. E-mail: diayalamontejo@gmail.com

20-22 May 2019. Montpellier, France

Biography