The efficiency of nitrogen and sulphur fertilization on yields and value of N:S ratio for Lolium × boucheanum B., Luty L., Musiał K. (2015): The efficiency of nitrogen and sulphur fertilization on yields and value of N:S ratio for Lolium × boucheanum. Plant Soil Environ., 61: 137-143.
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This paper deals with the efficiency of nitrogen (N) and sulphur (S) fertilization on yields and value of N:S ratio for hybrid ryegrass cultivated in monoculture and in a mix with white clover. The research was carried out from 2011–2013 near Krakow in southern Poland. Plants were evaluated in the context of diversified fertilization with nitrogen at rates of 50 and 100 kg N/ha as well as two sulphur-based fertilizers: Arista siarka and Pro-siarka, used at rates of 5, 10, 15 kg S/ha. Independent research findings have shown a clear synergism between nitrogen and sulphur, namely fertilization with sulphur in the form of Arysta siarka and Pro-siarka fertilizers that increased the yields of total aboveground biomass of the plants, from all cuts and decreased the values of the N:S ratio. The highest average dry matter yield was determined after the use of 50 kg N/ha and 15 kg S/ha in the form of Pro-siarka fertilizer, compared to fertilization with 50 kg N/ha, amounting to 0.52–2.08 t/ha for hybrid ryegrass and 0.15–2.40 t/ha for hybrid ryegrass with white clover, respectively. The highest average narrowing of the N:S ratio was calculated in plants fertilized with 100 kg N/ha and 15 kg S/ha in the form of Pro-siarka fertilizer.
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