Evaluation of micronutrient in soil treated with organic fertilizer / Avaliação de micronutrientes em solo tratado com fertilizante orgânico

ABSTRACT

Taking advantage of organic fertilizer for use in agriculture, may have beneficial effects for supplying organic matter and nutrients to the soil. The tested organic fertilizer is produced in a system of thermophilic composting of sewage sludge, the process by which it is mixed with chopped pruning urban, the crushed sugar cane and eucalyptus bark, and the mixture is subjected to aeration process revolving mechanical and oxidation promoted by an intense activity of microorganisms. The same is also additived with gypsum (Ca2SO4) in order to reduce the losses of ammonia from the process, helping to prevent odors and also attraction of vectors, besides enriching the material with calcium and sulfur, two macronutrients in plants. On the other hand the application of such compounds should be carefully monitored in order to prevent environmental risks from its use. This work aimed to evaluate the effect of rates of organic fertilizer (OF), in the Instituto de Zootecnia (IZ), in a Typic Acrudox soil, pHCaCl2= 4.9, cultivated with Aries grass (Panicum maximum, Jacq.), without liming and focused in soil micronutrients contents. Treatments involved four rates of OF application 0, 1.5, 3.0 and 4.5 t ha-1, mixed with soil before sowing the grass. The experimental design was a randomized blocks, with five replications, in pots (3.34 dm3). Soil samples were collected prior to the experiment

RESUMO

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