INVESTIGADORES
BARTOSIK Ricardo
congresos y reuniones científicas
Título:
Factors Affecting Carbon Dioxide Concentration in Interstitial Air of Soybean Stored in Hermetic Plastic Bags (Silo-bag)
Autor/es:
LEANDRO CARDOSO; RICARDO BARTOSIK; JUAN RODRIGUEZ; DARIO OCHANDIO
Lugar:
Chengdu, China
Reunión:
Conferencia; 8th International Conference on Controlled Atmospheres and Fumigation; 2008
Resumen:
In 2007 about 35 million tonnes of grains were stored
in hermetic systems (silo-bags) in Argentina, and about 17 million
tonnes of that were soybean. The soybean stored in these silo-bags is mostly
used for processing in the local industry (oil and soy-meal), but also for
seeds to be used during the next planting season. The goal of this research was
to conduct a series of field experiments in order to identify the main factors
affecting the CO2 concentration as an indicator of biological
activity and appropriate soybean storability conditions.
The
experiments consisted of monitoring the gas composition of the interstitial
air, grain moisture content (MC) and temperature of several silo-bags.
Additionally, the overall condition of the silo-bags was checked (broken areas,
improper sealing, bottom side perforations, etc). On average, biological
activity, measured as CO2 concentration, did not increase
substantially when soybean MC increased from 11 to 15.2%. The CO2
concentration for soybean with 14% MC or lower was below 2%. The average CO2
concentrations for silo-bags with soybean at 14 to 15.2% MC remained below 2%,
however, in some silo-bags the CO2 concentration increased to 5% at
the most. The average temperature of the soybean stored in silo-bags followed
the pattern of the average ambient air temperature through the seasons. There
was a small increase in the average CO2 concentration as a function
of the grain temperature increase (1.5% points of CO2 for about 10°C of temperature increase). When
individual silo-bags were analyzed, the CO2 concentration measured
during the warm storage season was up to 3 percentage points higher than when
measured during the cold storage season.