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The effect of rate of nitrogen application on dry matter yield and nitrogen fractions of sorghum at different stages of growth



The effect of rate of nitrogen application on dry matter yield and nitrogen fractions of sorghum at different stages of growth



Acta Agron Acad Sci Hung 16(1/2): 49-62



A randomized block design with 4 replicates was used to determine the response of Sorghum vulgare to increasing levels of fertilizer nitrogen. N application resulted in significant increases in both yield and protein content of the forage. The yield of crude protein was more than tripled in 1962 season when 140 lb./N fed [. 42 ha] were applied. Total and protein nitrogen, per gm dry matter, showed a continuous drop as growth proceeded. N application resulted in a progressive increase in the content of these 2 fractions at each growth stage, but protein N, as a percentage of total N, showed, generally, a steady decrease with the increase in the level of fertilizer N. Nitrate and other N constituted a considerable portion of the non-protein N content of sorghum at seedling and tillering stages. Ammonia and amide were, however, present in relatively small quantities. Nitrate seemed to be the principal form of N taken up from the soil. At flowering stage the nitrate-N fraction dropped to a low level, thus the consumption of forage by farm animals is recommended at this growth stage.

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