Resposta de cultivares de Brachiaria brizantha a doses de biofertilizantes de aves

Abstract

Cada vez mais fertilizantes são importados, fato que faz com que o uso de dejetos tratados seja alternativa econômica e sustentável para a produção de forragens. O objetivo do trabalho foi avaliar o efeito da aplicação de diferentes doses de biofertilizante de aves sobre a produção de forragem de cultivares de Brachiaria brizantha (Hochst.) Stapf. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro repetições, em esquema fatorial. O primeiro fator consistiu nos cultivares Marandu e Piatã de B. brizantha, enquanto o segundo fator correspondeu às doses de biofertilizante de aves (0, 50, 100 e 150 m3 ha-1). Foram avaliados os seguintes caracteres morfométricos: altura de planta (AP), comprimento da lâmina foliar (CLF), largura da lâmina foliar (LLF) aos 15, 30, 45 e 60 dias após a emergência (DAE), e massa de matéria verde e seca (MV e MS, respectivamente) das folhas, colmo e raízes aos 60 DAE. A dose de 50 m3 ha-1de biofertilizante de aves promoveu incrementos nas características morfométricas e produção de forragem dos cultivares Marandu e Piatã, enquanto doses de 100 e 150 m3 ha-1 ocasionaram a morte desses cultivares.

Recovery of degraded area of Urochloa decumbens with turkey litter fertilizer

“…The dosages of turkey litter that maximized the productivity of DM of Urochloa decumbens were 12.0 and 11.1 Mg ha -1 year -1 , resulting in the productivity of DM of 26.5 and 9.6 Mg ha -1 year -1 for the agricultural years 1 and 2, respectively. Silva et al (2014) applied biofertilizers of poultry waste in Urochloa brizantha, in Aquidauana-MS, and also verified a rising of the productivity of DM at the cultivation Piatã e Marandu until a maximum dosage, after that there's a decline in the productivity. The initial increase in the productivity of DM with small dosages of turkey was mostly due to the input of macro and micronutrients to the soil.…”

“…It is known that high doses of organic material, when applied to the soil, cause it's destructuring, mainly because of the unbalance between salts mono in relation with the bi and trivalent, causing clay dispersion and reducing the capacity of water infiltration and gas entrance at the soil. Silva et al (2014) verified in their experiment the death of the grass Piatã e Marandu due to the excess application of organic material. According to these authors, the death of the plants was on the account of the excess of nitrogen existent in the organic fertilizer.…”

“…According to these authors, the death of the plants was on the account of the excess of nitrogen existent in the organic fertilizer. Silva et al (2014) state that the elevated levels of nitrogen in poultry biofertilizer might have a toxic effect above a certain culture, being important to evaluate its dosages in order to provide a safe recommendation for the producing of forage.…”

“…Other benefits provided by the usage of wastes such as compost are the increase of the amounts of phosphorus and potassium in the soil, dry matter increase, of the levels of foliar phosphorus and of the crude protein (PINTO et al, 2012;SILVA et al, 2012;SILVA et al, 2014;SILVEIRA JÚNIOR et al, 2015). According to Fogel et al (2013), amongst the existing residues, the poultry litter stands out mainly for its economical factor (low-cost by tons), besides the easily for acquisition.…”