Effect of sulphur rates and sources on yield and mineral composition of white clover

• Autor(a) principal: Moreira, Adônis
• Data de Publicação: 1998
• Outros Autores: Evangelista, Antônio Ricardo, Carvalho, Janice Guedes de
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/4943
• topic: gypsum; dry matter; nutrients; crude protein; potassium sulfate; Trifolium repens; gesso; matéria seca; nutrientes; proteína bruta; sulfato de potássio; Trifolium repens

The sulphur effect on yield and mineral composition of white clover was studied under greenhouse conditions in plastic pots of 1.5 liter capacity, using a dystrophic dark red latosol (Oxisol) of "cerrado". The experimental design was completely randomized in a factorial scheme (4 x 3), with five replicates. Four rates of CaSO4.2H2O (0, 25, 50 and 100 mg kg-1 of S) and one rate of K2SO4 (50 mg kg-1 of S), in three cuttings were studied. The variables analyzed were: dry matter production (DM), amounts of crude protein (CP), P, K, Ca, Mg and S in the aerial dry matter. The highest DM yield was observed with the application of 100 mg kg-1 of S and the lowest was the one that did not receive S. The S sources did not affect yield. The last cutting showed the lowest yield, probably due to the nutrient depletion. The levels of CP, Ca and S raised with sulphur application and diminished in the last cutting. The levels of P, K and Mg varied according to the cutting number.