| Sumario: | The decanted phosphate (DP) is an environmental liability for the fertilizer industries
and its use as a phosphate fertilizer has been suggested in agriculture. However, there are
few researches that studies its efficiency. In this sense, this experiment was conducted
in a greenhouse with the main objective to evaluate the agronomic efficiency and the
relative economic efficiency of decanted phosphate (DP) in the presence and absence of
lime during three growth periods of Brachiaria brizantha cv. Marandu (marandu grass). In
addition, the critical levels of P were determined in soil and shoots of plants. The indices
Equivalent Triple Superphosphate medium (EqTS medium) e Relative Economic Efficiency
(REE) were calculated in order to evaluate the efficiency of DP and triple superphosphate
(TS). The critical levels of P were set when relative production was 90%. The DP efficiency
indices were more than 100% when not applied liming. The liming reduces the agronomic
and economic efficiency of DP. The P critical levels in soil and shoots of the marandu grass
were 15 mg dm-3 and 1.2 g kg-1, respectively.
|
|---|
Biblioteca Digital de Vanguardia