Instituto de Ciências Agrárias - CAF

URI permanente desta comunidadehttps://locus.ufv.br/handle/123456789/11784

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Initial performance of corn in response to treatment of seeds with humic acids isolated from bokashi
(Revista Ceres, 2015-11-12) Baldotto, Marihus Altoé; Baldotto, Lílian Estrela Borges
The humified organic matter presents bioactivity similar to the auxinic effect. As bokashi is produced by a special process of humification, information is needed about the bioactive potential of its humic acids. The objective of this work was studying the initial performance of corn-indicator plants in response to the application of different concentrations of humic acids isolated from bokashi. The corn seeds were treated for 16 hours with solutions containing 0, 10, 20, 30, 40 and 80 mmol L-1 of C in the form of humic acids. Then, the seeds were planted in pots of 1 dm3 containing corrected and fertilized soil, in greenhouse. Growth characteristics of shoot and root systems were evaluated. The results showed that the humic acids extracted from bokashi had positive effects on the initial performance of corn.
Initial performance of pineapple and utilization of rock phosphate applied in combination with organic compounds to leaf axils
(Revista Ceres, 2011-06) Baldotto, Marihus Altoé; Giro, Validoro Bazoni; Baldotto, Lílian Estrela Borges; Canellas, Luciano Pasqualoto; Velloso, Carlos Xavier
Rock phosphates have low solubility in water, but good solubility in acid. The use of organic compounds together with these phosphorus sources applied to the basal leaf axils of pineapple can increase the solubility of this phosfate source and increase the P availability to the crop. A greenhouse experiment was conducted using Araxá rock phosphate (10 g) in combination or not with solutions containing increasing concentrations of humic acids (0 to 40 mmol L-1 of carbon), with or without citric acid (0.005 mmol L-1), applied to basal leaf axils of pineapple cv. Pérola. Growth and nutritional characteristics of aerial plant parts were assessed. Growth rates of aerial parts and N, P, K, Ca and Mg contents increased curvilinearly with increasing concentration of carbon in the form of humic acids. Maximum values were found for the concentration of 9.3 mmol L-1 of carbon combined with 0.005 mmol L-1 of citric acid and natural phosphate.
The plant stimulant humic acid extracted from organic waste recycled by composting combined with liming and fertilization
(Semina: Ciências Agrárias, 2016-04-22) Baldotto, Marihus Altoé; Rocha, Jayna Eloy da; Andrade, Francine Dias Paes; Del Giúdice, Marcos Paiva; Baldotto, Lílian Estrela Borges
The disposal of organic waste can be an environmental problem; on the other hand, this waste can be the raw material for the production of biostimulants, among other recycling processes. The objective of this study was to recycle waste bovine manure and poultry litter through composting and isolate its humic acids in order to test their use, in the presence and absence of liming and fertilization, on corn plants as indicators. The experiment was conducted in a randomized block design with four replications. The experimental unit was a vase of 1 dm3 filled with soil that received treatments generated by the combination of the factors under study: humic acids via seed, liming, and fertilization. After thirty days of the experiment, growth characteristics were measured to estimate the initial performance of the indicator corn plants in response to the treatments. The results showed that the combination of chemical fertilization with humic acids extracted from organic compounds increased the plants development. In conclusion, the use of biostimulants based on humic substances is positive and complementary to fertilizers used in agriculture, forming a superior combination. Such use is also recommended because it allows for the recycling of organic waste via composting, as well as the preparation of biostimulants for added technical, and potentially economic, value.