Reaction of two spring wheat cultivars to nitrogen and sulphur fertilizer in the Swartland. II. Yield and baking quality

Plessis, J.P. du; Agenbag, G.A.

South African Journal of Plant and Soil 11(4): 189-195


ISSN/ISBN: 0257-1862
Accession: 002682886

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In a field experiment in 1990-91 at Langgewens Experimental Farm, South Africa, wheat cv. Palmiet and SST 66 were given 50, 100 or 150 kg N as a urea ammonium nitrate mixture and 0, 12.5, 25 or 50 kg S/ha as phospho-gypsum. At the lowest level all N was applied at sowing. At higher N levels the applications were split between sowing time, the end of tillering and booting growth stages. Palmiet gave a higher grain yield than SST 66. Increasing N application increased panicle numbers/msuperscript 2, more spikelets/panicle and grain yield. Grain weight was not affected by N or S, but Palmiet produced larger grains than SST 66. Favourable moisture conditions resulted in higher grain weight. S had no affect on the yield or yield components, but in 1990, applications of 12.5 or 25 kg S + 150 kg N significantly increased grain yields. The baking quality of SST 66 was better than that of Palmiet. It also had a higher protein content. Increasing N increased grain protein content, but in 1991 application of 150 kg N did not significantly increase grain protein content. The bread volume of SST 66 was improved by increasing the S from 0 to 25 kg, but above this amount, it decreased. S application had no effect on the bread volume of Palmiet. Application of 150 kg N increased the bread volume.