Nutrition of Tithonia diversifolia and attributes of the soil fertilized with biofertilizer in irrigated system

Abstract

The fertilization with biofertilizer associated with the use of irrigation favors nutrient uptake by plants and soil chemical properties; however, these effects are little studied in Tithonia diversifolia in semiarid regions. This study evaluated the effect of doses of bovine biofertilizer and irrigation on accumulation of nutrients in the leaves of Tithonia diversifolia plants and on soil chemical attributes. The study was carried out from December 3, 2014 to November 28, 2015, and arranged in a 2 x 5 factorial scheme, consisting of five doses of bovine biofertilizer (0, 40, 80, 120 and 160 m3 ha-1), combined with and without irrigation. The experiment was set in a randomized block design, using three replicates. Irrigation promoted increased accumulation of N, P, K, Ca, Mg, S, Zn, Fe, Mn, Cu and B in leaves of Tithonia diversifolia in the first cutting. However, the high bicarbonate concentration in the irrigation water and the occurrence of rainfall during the second crop increased the accumulation of Cu in the leaves of Tithonia diversifolia under rainfed condition, compared with irrigated plants. The increase in biofertilizer doses contributed to the increment of base saturation and the contents of organic matter, P and K in soil.

Volatilização de amônia do solo após doses de ureia com inibidores de urease e nitrificação na cultura do abacaxi

“…A maior disponibilidade de N, no solo do tratamento com ureia + NBPT, também pode ter ocasionado aumento da taxa de decomposição da MOS, diminuindo o pH do solo. A maior presença de N no solo promove a atividade microbiana responsável pela decomposição da MOS que pode aumentar a concentração de ácido carbônico (CO 2 + H 2 O H 2 CO 3 ), que se dissocia (H 2 CO 3 HCO 3 + H + ) e libera íons H + , reduzindo o pH do solo (Reis et al, 2016).…”

Yield, agronomic parameters and nutritional quality of Tithonia diversifolia in response to different fertilization levels

“…Los datos encontrados en proteína son consistentes con los reportados en la literatura a los 30 días de rebrote, donde se obtuvieron porcentajes entre 28.5 y 29.8 % (5,22) , y superiores a los reportados por otros autores, dado por los días al corte, altura de la planta al corte y fertilización (23,24,25) . La aplicación de biofertilizantes y riego incrementa significativamente la acumulación de nutrientes (26) .…”

Chemical Soil Attributes, Accumulation of Foliar Macronutrients and Productivity of the 'Vitória' Pineapple Plant Fertilized with Urea and Chicken Manure

“…In the second date, it was observed that the highest pH value was obtained with the addition of 3 g of urea and the lowest pH (4.9) with the highest dose of urea (20 g). In the present work, the lowest values of pH with the use of highest urea dose can be explained by the fact that the higher presence of N in the soil increases the carbonic acid concentration, due to the greater microbial activity, which are dissociated and release H+ ions, reducing soil pH as in [18,19], promoting higher concentrations of acids, and consequently more acidic pH. What was also observed by Silva et al [20] when evaluating urea doses in 'Vitória' pineapple plant, and was verified a similar effect on soil pH with doses increased.…”