Application of organic and inorganic materials and phosphorus adsorption in an Oxisol

Revista Brasileira de Engenharia Agrícola e Ambiental

Camacho-Tamayo, Jesús H.³  Daza-Torres, Martha C.²  Álvarez-Herrera, Javier G.¹ 

[1] Universidad Pedagógica y Tecnológica de Colombia;Universidad del Valle;Universidad Nacional de Colombia

关键词: chicken manure;    lime;    compost;    triple superphosphate;    chemisorption    INTRODUCCIÓN La deficiencia de fósforo (P) en los suelos del trópico y subtrópico seco es un problema de reconocida importancia;    cuya magnitud constituye una de las limitantes de mayor trascendencia en la producción de los cultivos;   

DOI  :  10.1590/S1415-43662008000500002

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The Oxisols present high fixation of phosphorus (P) caused by oxides and hydroxides of iron and aluminum in the clays. The application of mixtures of organic and inorganic materials can help to decrease this fixation. Two organic materials were used (chicken manure and compost) and two inorganic materials (lime and triple superphosphate). A total of thirteen treatments were established in randomized blocks and composed of different combinations of mineral and organic fertilizers. The adsorption of P was determined by means of the Langmuir isotherms, at the moment of the crop establishment and ten weeks later. All the treatments showed that when the concentration of P was increased, the curves of adsorption presented an asymptotic tendency and they were delimited at a level of maximum adsorption, which indicates the existence of chemisorption. When chicken manure was added in concentrations smaller than 25 mg L-1 of P, the adsorption of P decreased, and when the concentrations were greater than 75 mg L-1 the retention of P increased. The combined application of organic materials with chemical fertilizers presented the smallest fixation in P, nevertheless it has to be made periodically, because after 10 weeks the P adsorption increased again.

【 授权许可】

CC BY-NC