Eficiência de biofertilizante oriundo da metanogênese na cana energia
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2020-02-21
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Universidade Federal de Goiás
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Biofertilizer is a co-product obtained through the anaerobic fermentation of organic residues. It is presented, in general, in liquid form, having a variable composition of nutrients, mainly nitrogen, potassium and phosphorus. The study of agronomic variables is essential in crops that received the biofertilizer for the proper management of energy cane. Thus, the objective was to evaluate the effect of application and residual doses of biofertilizer from methanogenesis in energy cane during three years of cultivation. The experiment was carried out in a greenhouse at UFG. The soils used were: LATOSSOLO VERMELHO Ácrico (LVw) (490 g kg-1 of clay) and LATOSSOLO VERMELHO AMARELO Distrófico (LVAd) (160 g kg-1 of clay). The design was in randomized blocks, factorial scheme (2x6), with 2 soils of different textures and 5 doses of biofertilizer (0; 150; 300; 600 and 1200 m3 ha-) and an NPK treatment. The biofertilizer came from the methanogenesis of energy cane. Biometric analyzes (height, diameter and number of tillers) were carried out for cane plant monthly adding up to a total of ten evaluations, for cane ratoon I and II there were 5 evaluations. The productivity and fertility evaluation were carried out at the end of each cycle, whereas the leaf evaluations in the cane plant and ratoon II were in the period of 8 months of development of the culture. The physiological evaluations in the plant cane were carried out at 300 DAP. The results obtained were submitted to analysis of variance by the F test, and polynomial regression. For the tiller variable in the plant energy cane in the LVAd and LVw, it was noted that the higher the dose applied, the plant had a higher number of tillers. In the total green biomass in the cane plant in the LVAd and LVw the maximum efficiency doses were 1083.69 and 811.28 m3 ha-1 . The leaf potassium contents in the cane plant in the LVw were higher at doses of 600 and 1200 m3 ha-1 , with the following averages 8.27 and 9.19 g kg-1 . A linear increase in total dry biomass was observed in the first ratoon in the LVAd. In the second ratoon evaluation of soil fertility, a significant effect of treatment was observed only for organic matter in the soil. In general, the application of increasing doses of biofertilizer improves the productivity of cane energy plant and ratoon. The doses of biofertilizer in plant cane are significantly responsive to physiological variables: photosynthesis, stomatal conductance and transpiration. The residual effect of the biofertilizer on the second cane energy ratoon does not affect the development of the crop in height and diameter and stalk production, however it increases the number of tillers. The biofertilizer application increases the potassium content in the plant, and reflects in the stalks production of the energy cane plant.
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BARROS, L. R. Eficiência de biofertilizante oriundo da metanogênese na cana energia. 2020. 85 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2020.