Spring malt barley response to elemental sulphur - the prognostic value of N and S concentrations in malt barley leaves
Grzebisz, W.,Agricultural Univ., Poznan (Poland). Dept. of Agricultural Chemistry | Przygocka-Cyna, K.,Agricultural Univ., Poznan (Poland). Dept. of Agricultural Chemistry
A three-year study was undertaken to establish time courses of nitrogen and sulphur in spring malt barley leaves as the prerequisite tool for total grain yield prognosis. Sulphur application at the lowest rate of 25 kg/ha significantly increased yields of grain in 2001 and 2003. The time course of N and S concentrations in leaves over the growing season showed declining trends for N and variable trends for S. At mid tillering (BBA-25) both N and S, but at BBA-31 only N concentrations significantly responded to S rates, and in turn affected patterns of N concentration in barley organs up to maturity. Sulphur concentrations and N:S ratios were useful tools to make reliable prognosis of total grain yield of barley at BBA-31 as indicated by the obtained regression equations. The threshold values for N and S in leaves in order to achieve the maximum total grain yield are 0.4% for S and 8.0 for the N:S ratio as presented by the graphical procedure.
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