Emmerson Rodrigues de Moraes

NUTRIENTES NO SOLO E PRODUÇÃO DE QUIABO CONFORME DOSES DE SILICATO DE CÁLCIO E MAGNÉSIO

A acidez do solo e fator limitante na agricultura, pelo fato da mesma indisponibilizar o fosforo na solucao do solo e influenciar na dinâmica dos demais nutrientes no solo. A utilizacao de silicato de calcio (Ca) e magnesio (Mg) fornece silicio (Si) e corrige a acidez do solo aumentando a produtividade. O objetivo do estudo foi observar a producao do quiabeiro e as caracteristicas quimicas do solo em funcao da aplicacao de diferentes doses de silicato de calcio e magnesio. Utilizou-se o delineamento em blocos casualizados com cinco tratamentos e cinco repeticoes cultivado em 2014 e 2016. O silicato de calcio e magnesio foi aplicado ao solo nas seguintes doses: 0; 0,5; 1,0; 2,0 e 4,0 t ha -1 . Foram avaliados o peso de fruto por planta, peso medio de frutos, numero de frutos por planta, produtividade, e os teores de Si, Ca, Mg e pH do solo. Nao ha acrescimos nos componentes do rendimento e produtividade do quiabeiro com o fornecimento de silicato de calcio e magnesio em solo com boa fertilidade. O silicato de calcio e magnesio reduz a acidez do solo e aumenta os teores de Ca, Mg e Si disponiveis no solo.

CANA-DE-AÇÚCAR: BIOESTIMULANTES E ORGANOMINERAIS DE LODO DE ESGOTO

Brazil is the worlds largest producer of sugarcane, the main raw material used for the production of alcohol and sugar. The crop to achieve good levels of productivity demands high amounts of nutrients, which are usually supplied by the use of mineral fertilizers. An alternative for efficient fertilization is through the use of organomineral fertilizers. Such fertilizers consist of the mixture of organic fertilizers of animal or vegetable origin, and mineral fertilizers that undergo industrial processing. The industrial advance associated with the population increase has generated a large amount of solid waste and wastewater. One way to reduce the effects of environmental pollution from the presence of these solid wastes is through their treatment, giving rise to a pasty material, known as sewage sludge. Sewage sludge presents the potential to be used in the mineral nutrition of plants, both as fertilizer and as a soil conditioner. Biostimulants are natural or synthetic substances that can be applied directly to plants to increase yield and quality of crops of economic interest. Thus, the present review aims to report the study on the use of organomineral fertilizers from sewage sludge and biostimulant in sugarcane cultivation.

Seeds inoculation and nitrogen fertilization for cowpea production on latosol in the western amazon

The cowpea is an important food crop in the North and Northeast regions of Brazil, where the beans are consumed either green or ripe. Yet, considering its socio-economic importance and its tropical origin, cowpea yields are low in those regions, due to inadequate cultivation practices and incorrect soil management. Therefore, the objective of this study was to study the development of cowpea crop inoculated and fertilized with two different nitrogen (N) sources. The experiment was conducted in the municipality of Rorainópolis (RR). The experimental design was randomized blocks with four treatments and five replications. The plant material was ‘BRS Guariba’ cowpea cultivar, and the treatments were: (i) control (no nitrogen fertilization), (ii) seeds inoculated with Bradyrhizobium elkanii, (iii) urea as N source (60 kg N ha), and (iv) ammonium sulphate as N source (60 kg N ha). The following crop traits were evaluated: foliar macronutrients (N, P, K, Ca, Mg and S), green and dry weight of shoots, dry beans per plant, pod yield and bean yield. Urea and ammonium sulphate promoted high accumulation of nutrients in leaves. Ammonium sulphate also stood out regarding productivity traits, thus proving to be a viable N source for cowpea in the Amazon region. The nodulation with Bradyrhizobium elkanii wasn’t efficient to replace the fertilization with nitrogen fertilizers for cowpea BRS Guariba.