EFFET DE L’ADDITION DE SOUFRE A UNE FERTILISATION DE N, P ET K SUR LES RENDEMENTS ET LA QUALITE DE L’ORGE CULTIVEE EN SERRE

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Abstract
The effect of sulfur was compared with that of nitrogen, phosphorus and potassium on the yield and quality of barley (Hordeum vulgare L.) grown under greenhouse conditions. The work, which included 20 treatments, was carried out on the sandy–loam Saint-André and on the silty–clay Kamouraska. Nitrogen gave greatest differences in the yield of grain and straw on both soils. However, low level or lack of sulfur as well as phosphorus and potassium caused a significative decrease in grain yields in relation with the maximum yield on the Saint-André soil while only the lack of phosphorus produced a similar effect on the Kamouraska soil. Grain analysis showed mean values of 1.05% N, 0.41% P, 0.50% K and 0.10% S which were more constant in relation to the different treatments and the two soils than the ratios N:S (~ 10) and S:P (~ 0.25). The results on the accumulation of sulfur in straw and the variation in the efficiency of added fertilizers made it difficult to relate the need of sulfur for barley with the nitrogen and the phosphorus concentrations in the plants.