Ruzigrass affecting soil-phosphorus availability

Pesquisa Agropecuária Brasileira

Alexandre Merlin²  Zhenli Li He¹  Ciro Antonio Rosolem² 

[1] ,Universidade Estadual Paulista Departamento de Fitotecnia Botucatu SP ,Brazil

关键词: Brachiaria ruziziensis;    Urochloa ruziziensis;    cover crops;    crop rotation;    P cycling;    phosphorus fractionation;    Brachiaria ruziziensis;    Urochloa ruziziensis;    cultivos de cobertura;    rotação de culturas;    ciclagem de P;    fracionamento de fósforo;   

DOI  :  10.1590/S0100-204X2013001200007

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the effectiveness of ruzigrass (Urochloaruziziensis) in enhancing soil-P availability in areas fertilized with soluble or reactive rock phosphates. The area had been cropped for five years under no-till, in a system involving soybean, triticale/black-oat, and pearl millet. Previously to the five-year cultivation period, corrective phosphorus fertilization was applied once on soil surface, at 0.0 and 80 kg ha-1 P2O5, as triple superphosphate or Arad rock phosphate. After this five-year period, plots received the same corrective P fertilization as before and ruzigrass was introduced to the cropping system in the stead of the other cover crops. Soil samples were taken (0-10 cm) after ruzigrass cultivation and subjected to soil-P fractionation. Soybean was grown thereafter without P application to seed furrow. Phosphorus availability in plots with ruzigrass was compared to the ones with spontaneous vegetation for two years. Ruzigrass cultivation increased inorganic (resin-extracted) and organic (NaHCO3) soil P, as well as P concentration in soybean leaves, regardless of the P source. However, soybean yield did not increase significantly due to ruzigrass introduction to the cropping system. Soil-P availability did not differ between soluble and reactive P sources. Ruzigrass increases soil-P availability, especially where corrective P fertilization is performed.

【 授权许可】

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