| Popis: |
The application of organic materials as fertilizers is a common practice in clean production and organic systems, however, there is not enough technical criteria to measure the right dose. In this sense, overdoses or underdosing may occurs affecting the profitability of the production system. For this reason, it was used seven organic materials, commonly used in the Sabana de Bogotá, three derived from crop residues (Sagaro Compost, Compost CIAA (ICCA), soil-aid®) and four derived from animal waste (chicken, pork, rabbit and ground lombris derived humus). It was determined its potentially mineralizable nitrogen and the rate of nitrogen mineralization using the incubation method. The experimental design was completely randomized with eight treatments (seven organic materials and a control), and three repetitions for a total of 24 experimental units. The measurement was performed at weekly intervals from week one to week nine, after incubation. Waste materials derived from animals were generally better than those from plant residues in the N mineralization process, as is the case of rabbit-derived humus that release 5.197 mg·kg-1 of mineral nitrogen, a value that represents 20% of initial total Nitrogen. The degree of adjustment of logarithmic model was more than 80% (R2> 0.80) in 86% of the evaluated materials. |
