Effect of Ureaform, SCU and Melamine on Barley Growth and their Nitrogen Supplying Ability

Ureaform, SCU, Melamine의 질소공급력(窒素供給力)과 보리 생육(生育)에 대(對)한 효과(效果)

  • Lim, Sun-Uk (Department of Agricultural Chemistry, College of Agriculture, Seoul Natl. University) ;
  • Oh, Nam-Soon (Department of Agricultural Chemistry, College of Agriculture, Seoul Natl. University)
  • 임선욱 (서울대학교 농과대학 농화학과) ;
  • 오남순 (서울대학교 농과대학 농화학과)
  • Published : 1984.09.25

Abstract

To investigate nitrogen supplying effect of some slowrelease N-fertilizers on barley in upland soil sulfurcoated urea(SCU), ureaform and melamine (1,3,5-Triazine-2,4,6-triamine) were treated and compared to urea. In addition, thiourea as a nitrification inhibitor was also tested. Effects of variable soil condition such as moisture content, pH and temperature on nitrogen supplying ability of the fertilizers and on growth of barley were studied through incubation test and pot culture and the obtained results were summarized as follows: The releasing rate of ammonia from urea, SCU, ureaform and melamine were resulted as 27-59%, 25-39%, 9-34% and 0.7-4.3% at maximum conversion rate, respectively. Nitrification rate of the tested fertilizers was higher at pH 6.54 markedly than at pH 4.73. Addition of thourea depressed the formation of $NO_3$ during four weeks of incubation period. Mixed application of ureaform with small amount of urea contributed to nitrogen supply till latter growth stage of barely Basal application of melamine showed lowest nitrogen supplying ability and injurious response on barley growth.

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