EFFECT OF NITROGEN AND SULFUR FERTILIZATION ON GROWTH, YIELD, QUALITY, NITRATE AND PRUSSIC ACID CONTENT OF TWO FORAGE SORGHUM (Sorghum bicolor L. moench) CULTIVARS

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Date
2015-06-15
Authors
GHADA AWAD AHMED, ZAID
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UOFK
Abstract
Forage sorghum (Sorghum bicolor (L.) Moench) cultivar (Abusabien) and sorghum sudangrass hybrid (Pioneer 988) were used in a forage experiment at the Demonstration Farm of the Faculty of Agriculture, University of Gezira, Wad Medani, Sudan over two seasons (during the period 2001 to 2003) to study the effect of nitrogen and sulfur fertilization on growth, yield, quality, nitrate and prussic acid content. Parameters studied included: plant density, number of leaves /plant, stem diameter, leaf area (l.A.), shoot to root ratio (S.R.R), leaf to shoot ratio (L.S.R.), forage yield (fresh and dry)and nutritive value ( C.P% and C.F%). In addition to nitrate concentration and prussic acid (HCN) content. Higher rate of nitrogen (80IbN/fed, 1fed=0.42ha) significantly increased a number of growth attributes, forage yield (fresh and dry), crude fibre percent, nitrate and prussic acid content of Abusabien cultivar. In all sampling occasions during the first season, the prussic acid concentrations were above the level considered to be toxic (>204ppm) and were higher than in the second season which were below the toxic level. Nitrate concentration was low in general and declined with crop age from 41.13ppm to 2.76ppm in the first season and from 9.89ppm to 1.23ppm in the second season. In both seasons all levels of nitrate were below to the toxic level (2,100ppm). Generally Pioneer had a lower content of nitrate than Abusabien. Prussic acid concentrations in both seasons declined with crop age from 298.81ppm to 260.24ppm in the first season and from 177.08ppm to 142.99ppm in the second season.
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EFFECT OF NITROGEN AND SULFUR FERTILIZATION ON GROWTH, YIELD, QUALITY, NITRATE AND PRUSSIC ACID CONTENT
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