ESTUDIO DE LOS EFECTOS DE DIFERENTES OPCIONES DE FERTILIZACIÓN Y ROTACIONES SOBRE EL CULTIVO DE CAMELINA EN UNA REGIÓN SEMIÁRIDA DE ESPAÑA

Abstract

A study was carried out for three growing seasons on camelina (Camelina sativa L. Crantz) to evaluate its response to different fertilizers: dehydrated sewage sludge, composted sewage sludge and mineral fertilization, as well as its rotation with barley (Hordeum vulgare L.) and fallow. The camelina crop was sown in autumn and harvested in spring-summer; its germination was greater with dehydrated sewage sludge fertilization than with mineral fertilization in all seasons. The germination of the barley crop was lower with the mineral fertilization in the first growing season and with the control in the third season compared to the rest of the treatments. The development of camelina and barley was very much influenced by meteorological conditions. The last growing season had the lowest productivity due to limited rainfall and high temperature at the end of this growing season. The camelina presented the larger yields with fertilization of dehydrated sewage sludge than with control and composted sewage sludge after the first season. Barley also presented the largest productions with dehydrated sewage sludge compared to the mineral and without significant differences compared to the composted sewage sludge. After the three growing seasons, fertilizer treatments increased the amounts of nitrogen, phosphorus and potassium in the soil compared to control and organic fertilization improved soil parameters such as organic matter. The highest economic yields were for the unfertilized crop and the dehydrated sewage sludge compared to the rest of the treatments.