Combination of mineral and organic fertilizers of slaughterhouse-waste products for cultivation of upland rice cultivars
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Due to the expansion of the slaughterhouses sector, there is huge availability of waste from agricultural products. These waste products may be used as alternative for the production of organic fertilizers. Fertilizer efficiency depends on the type of rice cultivar. Thus, traditional, intermediate and modern plant types may respond differently to the combined use of mineral and organic fertilizers. The objective of this study is to evaluate the effects of different combinations of mineral and organic fertilizers based on slaughterhouse waste on the development, productivity and industrial quality of upland rice cultivars. The soil of the the experimental area was a typical clayey dystroferric Red Latosol and the climate of the region is Aw: humid tropical, rainy in the summer and dry in the winter according to the Koppen classification. The experimental design was randomized blocks arranged in a 3 x 6 factorial design. We evaluated three different types of rice cultivars (Caiapó, traditional type; BRS Primavera, intermediate type; and IAC 202, modern type) and levels of combinations of mineral and organic fertilizers (100% mineral, 80% mineral + 20% organic, 60% mineral + 40% organic, 40% mineral + 60% organic, 20% mineral + 80% organic, 100% organic). The cultivar IAC 202 presented a productive potential higher than the cultivars Caiapó and BRS Primavera. The 60% mineral + 40% organic and 40% mineral + 60% organic fertilizer combinations produced more yield in comparison with the 100% organic fertilizer. The cultivar Caiapó showed the highest grain quality. Organic fertilizer based on slaughterhouse waste can be used for upland rice farming.
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