Effectiveness of fused magnesium potassium phosphate for marandu grass

Revista Brasileira de Ciência do Solo

Valdeci Orioli Júnior²  Edson Luiz Mendes Coutinho¹ 

[1] ,Universidade Estadual Paulista Faculdade de Ciências Agrárias e Veterinárias Jaboticabal SP

关键词: Brachiaria brizantha;    particle size;    critical level;    Brachiaria brizantha;    potássio;    granulometria;    nível crítico;   

DOI  :  10.1590/S0100-06832009000600034

来源: SciELO

【 摘 要 】

The current high price of KCl and great dependence on importation to satisfy the Brazilian demand indicate the need for studies that evaluate the efficiency of other K sources, particularly those based on domestic raw material. For this purpose, a greenhouse experiment was conducted with samples of a sandy clay loam Typic Haplustox, in a completely randomized 4 x 3 x 2 factorial design: four K rates (0, 60, 120, and 180 mg kg-1), three sources (potassium chloride (KCl), fused magnesium potassium phosphate (FMPP) and a mixture of 70 % FMPP + 30 % KCl) and two particle sizes (100 and 60 mesh), with three replications. Potassium fertilization resulted in significant increases in shoot dry matter production and in K concentrations, both in soil and plants. The K source and particle size had no significant effect on the evaluated characteristics. Potassium critical levels in the soil and the shoots were 1.53 mmol c dm-3 and 19.1 g kg-1, respectively.

【 授权许可】

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