José Alfredo da Fonseca

Aplicação de resíduo de reciclagem de papel em Cambissolo Háplico e seu efeito no solo e no cultivo de plantas

The paper recycling process produces a large amount of waste and applying it on the soil may be one important strategy for use of this product. However, it is necessary to study the effects of application of this waste product on soil properties and crop performance. The aim of this study was to evaluate the effect of paper recycling waste on the chemical properties of an acidic Inceptisol and on the yield of soybean and common bean. A randomized complete block design was used, with three replications. The following treatments were evaluated: paper recycling waste at the rates of 50, 100, 150, 250, 400 and 600 Mg ha-1 of wet mass; dolomitic limestone to raise soil pH in water to 6.0; and a control, without waste or limestone application. The recycling waste increased soil pH and Ca and P levels. The application rates of recycling waste did not affect the levels of heavy metals in the soil and in the grains, even at the higher rates. The greatest yields of soybean and common bean were obtained at the rates of 323 and 372 Mg ha-1 of waste wet mass, respectively.

EFEITO DE PÓ DE BASALTO NO SOLO E EM CULTURAS ANUAIS DURANTE QUATRO SAFRAS, EM SISTEMA DE PLANTIO DIRETO1

The powder basalt has been used as a source of nutrients in some regions of Brazil. However, there is scarce knowledge about the effects of this product on the soil fertility and crop yield. The objective of this research was to evaluate the effect of powder basalt, combined with the presence or absence of chemical fertilization, on the yield of soybean and corn and on some soil chemical properties. An experiment was conducted in randomized complete block design with three replications and split plot. In the plots five doses of powder basalt were allocated: 0, 2, 4, 8 and 12 ton ha-1, with very fine particle size. In the subplots two fertilization strategies were allocated: with or without chemical fertilization. The following sequence of crops in summer/winter were used: soybean/black oat + common vetch (2009/2010); corn/black oat (2010/2011); soybean/black oat + common vetch (2011/2012 season) and corn (2012/2013). The powder basalt did not affect the productivity of soybeans and corn, with or without chemical fertilization. The powder basalt had little effect on the soil chemical properties