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Accueil du site → Master → Mexique → Maestría → Optimización de la producción de biomasa de la cianobacteria Scytonema ocellatum cepa slc1097-22, evaluación de su capacidad como biofertilizante y su contribución en la retención de humedad en el suelo

Centro de Investigaciones Biológicas del Noroeste (CIBNOR) 2003

Optimización de la producción de biomasa de la cianobacteria Scytonema ocellatum cepa slc1097-22, evaluación de su capacidad como biofertilizante y su contribución en la retención de humedad en el suelo

Álvarez González, Azucena

Titre : Optimización de la producción de biomasa de la cianobacteria Scytonema ocellatum cepa slc1097-22, evaluación de su capacidad como biofertilizante y su contribución en la retención de humedad en el suelo

Auteur : Álvarez González, Azucena

Etablissement de soutenance : Centro de Investigaciones Biológicas del Noroeste (CIBNOR)

Grade : Maestría en Ciencias en el Uso, Manejo y Preservación de los Recursos Naturales 2003

Résumé
This study was developed in four parts : The first concerned the optimization of biomass production of cyanobacteria Scytonema ocellatum strain SLC1097-22, obtained from the tropical dry forest in the Sierra de la Laguna, B.C.S. The second and third parts correspond to application of the cyanobacteria to soil to evaluate its effects on moisture retention and release of nitrogen compounds to the soil to serve as fertilizer in chili cultivation. The fourth part evaluated survival and integrity of cyanobacteria applied to soil. S. ocellatum showed the fastest growth under the following conditions : constant illumination at 23°C at a light intensity of 200 µEm-2s-1 to glass flasks with a volume of less than 2L and at a blue light intensity of 500 µEm-2s-1 to transparent 19-L plastic water containers. Moisture retention in soil was evaluated in a greenhouse in planting pots, as well as in the field. Results showed that S. ocellatum was able to provide a large percent of moisture-holding capacity to soil, as long as the temperature did not exceed 30°C and the relative humidity was above 60%. The effect of nitrogen compounds released to the soil as a nutrient for chili plants showed no significant difference in weight and length of chili peppers between treatments with cyanobacteria and the control. However, protein content increased in the S. ocellatum treatments, especially in those where cyanobacteria were applied at the seedling stage. Survival and integrity of S. ocellatum in soil differed, depending on the cyanobacterium’s location in the colony. Inner filaments maintained their integrity and remained green while the outer filaments changed their pigmentation to brown or collapsed and died. This study supports the use of Scytonema ocellatum as a biofertilizer because : 1) Crop quality, in terms of protein content was enhanced ; 2) Chemical nitrogen fertilizers were reduced, 3) Soil moisture retention improved ; and 4) The cyanobacterium survived at least 2 months in top soil.

Mots Clés : Cianobacteria ; producción de biomasa ; retención de humedad ; biofertilizante

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