Biofertilzers with natural phosphate, sulphur and Acidithiobacillus in a siol with low available-P

Scientia Agricola

Newton Pereira Stamford¹  Patrícia Ribeiro Dos Santos¹  Adriana Muniz Mendes Freire De Moura¹  Carolina Etiene De Rosália E Silva Santos¹  Ana Dolores Santiago De Freitas¹ 

[1] ,Universidade Federal Rural de Pernambuco Departamento de Agronomia Dois Irmãos PE ,Brasil

关键词: Pachyrhizus erosus;    P uptake;    phosphorus fertilization;    yam bean;    Pachyrhizus erosus;    jacatupé;    fertilização fosfatada;    solo ácido;   

DOI  :  10.1590/S0103-90162003000400024

来源: SciELO

【 摘 要 】

The production of mineral fertilizers is a expensive process, since it requires high energy consumption, and cannot be produced by small farmers. Laboratory assays were conducted to produce P-biofertilizers from natural phosphate (B5, B10, B15, B20), applying sulphur at different rates (5; 10; 15 and 20%) inoculated with Acidithiobacillus (S*) and testing increasing periods of incubation. A greenhouse experiment was carried out to evaluate the effect of the biofertilizers in a soil with low available P (Typic Fragiudult) from the "Zona da Mata" of Pernambuco State, grown with yam bean (Pachyrhizus erosus) in two consecutive harvests. The treatments were: Natural Phosphate (NP); biofertilizers produced in laboratory (B5, B10, B15, B20) with sulphur and Acidithiobacillus (NP+S*); natural phosphate with sulphur (20%) without Acidithiobacillus (NP+S); triple super phosphate (TSP) and a control without phosphorus. Plants were inoculated with a mixture of rhizobia strains (NFB 747 and NFB 748) or did not receive rhizobia inoculation. In bioassays pH and available P in the biofertilizers were analyzed. In the greenhouse experiment shoot dry matter, total N and total P in shoots, soil pH and available P were determined. Higher rates of available P were obtained in biofertilizers with sulphur and Acidithiobacillus (NP+S*) and in triple super phosphate (TSP), and biofertilizers with sulphur and Acidithiobacillus (FN+S*) and triple super phosphate (TSP) increased plant parameters. Native rhizobia were as effective as the strains applied in inoculation. After the two harvests soil presented lower pH values and higher rates of available P when the biofertilizers B15 and B20 with sulphur and Acidithiobacillus were applied.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License