Centenario, Brazil
Centenario, Brazil

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de Lourdes Silva de Lima R.,Rua Osvaldo Cruz | Severino L.S.,Rua Osvaldo Cruz | Severino L.S.,Texas Tech University | Gheyi H.R.,Nucleo de Engineering de Agua e Solo UFRB | And 2 more authors.
Revista Ciencia Agronomica | Year: 2011

The addition of phosphorous to the substrate for the production of seedlings promotes faster growth of both root and shoots, increases tolerance to environmental stress and diseases, and even improves the efficiency of nutrient and water use in several plant species. This experiment aimed to study the effect of the addition of simple superphosphate to the substrate on the growth and macronutrient levels in the contents of seedlings of Jatropha curcas. A substrate containing soil and urban-waste compost was modified by the addition of simple superphosphate in 0; 2.5; 5.0; 7.5; 10.0 and 12.5 kg m -3 amounts. The seedlings were evaluated 30 days after planting. Maximum growth of the Jatropha plants was observed for the simple superphosphate added in estimated amounts in the range of 5 to 8 kg m -3. The phosphorus fertilization especially favored the growth of leaf-area and roots, and promoted increase in contents of all macronutrient except calcium.


de Lima R.L.S.,Rua Osvaldo Cruz | Severino L.S.,Texas Tech University | Sofiatti V.,Rua Osvaldo Cruz | Gheyi H.R.,Federal University of Campina Grande | And 2 more authors.
Revista Caatinga | Year: 2011

Substrates containing 0, 10, 20, and 40% (v/v) of urban waste compost were evaluated for the production of Jatropha (Jatropha curcas L.) seedlings in polytube containers. At 40 days after planting, growth characteristics and macro nutrient content in shoot were determined. The urban waste compost added to the substrate promoted increase in Jatropha plants growth. The maximum growth was obtained with the estimated dose of 24% of compost mixed with subsoil material. Increments in the dose of compost caused linear increase in K, Mg, and S shoot content, but N and Ca contents were reduced by dilution, as the shoot dry mass increased more than the uptake of those nutrients.

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