Sources and rates of residual phosphorus for Marandu palisadegrass grown in Western São Paulo

Autores

  • Vinícius Martins Silva Unesp - Campus Ilha Solteira
  • Salatiér Buzetti Unesp - Campus Ilha Solteira
  • Elisângela Dupas Unesp - Campus Ilha Solteira
  • Marcelo Carvalho Minhoto Teixeira Filho Unesp - Campus Ilha Solteira
  • Fernando Shintate Galindo Unesp - Campus Ilha Solteira

DOI:

https://doi.org/10.15361/1984-5529.2016v44n4p615-622

Resumo

The pastures of western São Paulo are grown on low fertility soils, therefore, forage has low nutritional value resulting low dry matter yield (DMY).Thus, phosphorus fertilization and analysis of its residual are important for livestock, as it interferes the development speed of forage grasses, allowing better use of area and helping to pasture maintenance, in addition maintaining DMY at adequate levels. This study aimed at evaluating the effect of sources and rates of phosphorus applied in Marandu palisadegrass (Urochloa brizantha cv. Marandu) maintenance to reduce its seasonality, in order to achieve higher yield of these plants. A randomized block de­sign used with 16 treatments and four replications in a 4 x 4 factorial, consisted of four sources of P (Phosphate from Araxá, Reactive phosphate from Arad, Simple superphosphate and thermophosphate) at rates (0, 100, 200 and 300 kg ha -1 of P2O5). A total of ten cuts were performed. DMY was quantified and contents of crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) were determined and P concentrations of Marandu palisadegrass shoot. The residual of sources and P rates did not influence DMY, CP, NDF and ADF contents and P concentrations of plant tissue, indicating that for maintaining Marandu palisadegrass P levels in soil were sufficient and this forage is not demanding regarding this nutrient.

Biografia do Autor

Salatiér Buzetti, Unesp - Campus Ilha Solteira

Departamento de Fitossanidade, Engenharia Rural e Solos.

Elisângela Dupas, Unesp - Campus Ilha Solteira

Departamento de Fitossanidade, Engenharia Rural e Solos.

Marcelo Carvalho Minhoto Teixeira Filho, Unesp - Campus Ilha Solteira

Departamento de Fitossanidade, Engenharia Rural e Solos.

Publicado

11/11/2016

Edição

Seção

Solos e Nutrição de Plantas - Soils and Plant Nutrition