A B S T R A C TThe study was conducted in a greenhouse at the Agricultural Research Corporation of Rio Grande do Norte (EMPARN), in order to evaluate the effect of biofertilizers and potassium phosphate rocks, triple superphosphate (TSP) and potassium chloride (KCl), crushed rocks on the chemical properties of the soil and performance of the bacteria Paenibacillus polymyxa in the absorption of macronutrients by the cowpea bean crop. An Ultisol (10 kg per pot) was used with the addition of biofertilizers at levels 40, 70, 100 and 200% of recommendation for TSP and KCl, inoculated or not with bacteria. There was an effect of fertilization on the absorption of macronutrients, being the best results for P and K with TSP + KCL, and N, Ca and Mg for the biofertilizers. In the chemical properties of the soil, the pH was lower in biofertilizers of higher levels, but it was better especially with its addition to P (BPK200). For Ca it was better with TSP + KCl, and Mg with pure rock. The P. polymyxa did not influence in absorption of elements by the plant. The biofertilizers and rocks could satisfy the nutrient needs of the plants by making them potential for sustainable agriculture.Biofertilizantes e performance do Paenibacillus na absorção de macronutrientes pelo feijão caupi e fertilidade do solo R E S U M O O trabalho foi conduzido em casa de vegetação, na Empresa de Pesquisa Agropecuária do Rio Grande do Norte (EMPARN) para avaliar o efeito de biofertilizantes de rochas potássica e fosfatadas, superfosfato triplo (SFT) e cloreto de potássio (KCl), rochas moídas nas propriedades químicas do solo e no desempenho da bactéria Paenibacillus polymyxa na absorção de macronutrientes na cultura do feijão caupi. Utilizaram-se 10 kg de um Argissolo Amarelo Distrófico por vaso com adição dos biofertilizantes nos níveis 40, 70, 100 e 200% da recomendação para SFT e KCl, inoculados ou não com a bactéria. Houve efeito da fertilização na absorção dos macronutrientes sendo os melhores resultados para P e K com SFT+KCL, e N, Ca e Mg para os biofertilizantes. Nas propriedades químicas do solo o pH foi mais reduzido nos biofertilizantes de maiores níveis porém melhorando com sua adição especialmente para P (BPK200). Para Ca foi melhor com o SFT+KCl, e para Mg rocha pura. O P. polymyxa não influenciou na absorção dos elementos na planta. Os biofertilizantes e as rochas supriram a necessidade de nutrientes das plantas revelando-se como potencial para uma agricultura sustentável. Key words:PRPG rock powder phosphorus potassium Palavras-chave: RPCP pó de rocha fósforo potássio
The use of domestic sewage in the agriculture is an alternative for reduction of the pollution of rivers, preservation of resources hydrics and availability of water and nutritious for plants. An experiment was conducted to investigate the effects of irrigation with sewage effluent and rhizobia inoculation on growth parameters and macro and micronutrients contents in shoots of leguminous trees grown in an Alisol in northeastern Brazil. Irrigation with sewage effluent and rhizobium inoculation affected significantly the growth parameters and nodulation of L. leucocephala and M. caesalpiniaefolia. Statistically higher values of shoot dry matter and plant height were observed in leguminous trees irrigated with sewage effluent, compared to treatment with water irrigation.Sewage effluent irrigation treatment also increased significantly the contents of N, P, K, Ca, Mg, Fe, Zn and Mn in shoots of woody legumes studied after harvest. Inoculation with Rhizobium promoted significant increases in growth parameters and macro and micronutrients contents, only when associated with application of sewage effluent.
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