134-7 Phosphorus Content Affected By Soil Type, Phosphorus Sources, Limestone and Silicate.

Poster Number 834

See more from this Division: SSSA Division: Nutrient Management & Soil & Plant Analysis
See more from this Session: Macronutrients: II
Monday, November 3, 2014
Long Beach Convention Center, Exhibit Hall ABC
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Silvia Capuani1, Dirceu Maximino Fernandes Sr.2, João Paulo Rigon1, Gleize Leviski De Brito3, Gustavo Castoldi4, Jos Carlos Coelho Sr.3 and Mariângela Brito Freiberger5, (1)São Paulo State University, Botucatu, BRAZIL
(2)Ciencia do Solo, FCA - UNESP, Botucatu, Brazil
(3)So Paulo State University, Botucatu, Brazil
(4)Crop Science, São Paulo State University, Botucatu, São Paulo, BRAZIL
(5)Soil Science and Natural Resources, São Paulo State University, Botucatu, São Paulo, BRAZIL
The experiment aimed to study the collaboration of silicate in two types of soils in the availability of P against different sources of P. The experiment was carried out in a greenhouse, in Sao Paulo State University, Brazil. It was used a completely randomized design arranged in a 3x3x2 factorial scheme, with three correctives combinations, three phosphorus sources and two types of soils (sandy-loam soil and a clayey soil). Both soils were mixed with the correctives (silicate (S) and limestone (L)) as the following combinations: 50% S + 50% L; 100% S and 100% L. Then the soil was wet (70% of field capacity) and incubated in 20 l pots through 30 days. After incubation period we incorporated to the soil the phosphorus sources 30 days later: triple superphosphate (TSP), reactive phosphate, and a pricipitated phosphate, at a dose of 300 mg dm-3 P. The P content in the soil was determined by Mehlich-1 method. Data were submitted to variance analysis and the averages compared by Tukey test (p<0,05). The results indicate that reactive phosphate releases more efficiently P in both soils. In addition, the treatment with 100% L provided higher P contents in the clayey soil.
See more from this Division: SSSA Division: Nutrient Management & Soil & Plant Analysis
See more from this Session: Macronutrients: II