Micronutrients in castor-oil plants (Ricinus communis L.) growing in soil fertilized with biosolids
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Universidad Autónoma Chapingo
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Alkaline calcareous soils, typical of arid zones, can limit the availability of soil micronutrients for some crops. The aim of this work was to assess micronutrient concentrations in soil and castor-oil plants when soil fertilization involved ammonium sulfate and two types of biosolids. Treatments were designed taking into account three nitrogen (N) sources and three doses of each source plus the control (no fertilization). The N sources were ammonium sulfate (AS), biosolids from wastewater treatment plants with oxidation ponds (OPB), and with activated sludge (ASB). The N doses were 0 (control), 134, 200 and 260 kg∙ha -1. A randomized complete block experimental design with four replicates was used. Dry matter yield and seed oil content rose with increasing N rates. The highest concentrations of Cu and Fe in soil after harvest were obtained with OPB treatments, with means of 0.98 mg∙kg -1 Cu and 5.20 mg∙kg -1 Fe. Results suggest that the biosolids provided the necessary micronutrients for adequate development of Ricinus communis plants without risk of toxicity and pollution.
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Agrociencias