Analyses of accumulation of silica in the growth of two tropical forages using simple equations

Masataka Shimojo, Takashi Bungo, Manabu Tobisa, Yoshimi Imura, Naoki Koga, Tao Shao, Muhammad Yunus, Yutaka Nakano, Ichiro Goto, Mitsuhiro Furuse, Yasuhisa Masuda

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Abstract

The present study was conducted, using simple equations, to analyze the accumulation rate of silica [ARSi], that of minerals [ARM] and silica content changes with growth of Rhodes grass [Rg] and Greenleaf desmodium [Gd]. The following two equations were suggested for analyses: ARSi = 1/W · d(Si)/dt = (1/w · dM/dt) · d(Si)/dM, (A) Changes in silica content = 1/1000 · ((Si)2/W2-(Si)1/W1) = (1 - W1/W2) · {1/1000 · (ARSi/RGR - (Si)1/W1)}, (B) where W=forage dry weight (g/m2), Si=amount of silica in the forage (mg/m2), M=amount of minerals in the forage (mg/m2), (1/W)·(d(Si)/dt)=ARSi, (1/W)·(dM/dt)=ARM, (d(Si)/dM)=accumulation of silica per unit accumulation of M[ASiAM], RGR=mean relative growth rate [RGR] of forages over the interval t1 to t2, ARSi=mean ARSi over the interval t1 to t2, (1-W1/W2)=forage growth index [FG index], {ARSi/RGR-(Si)1/W1}1000=an index for forage growth dependent silica accumulation [FGDSiA index]. Analyses using equation (A) suggested that Rg showed a higher selection of silica in the accumulation of minerals, when compared with Gd. Analyses using equation (B) suggested that Rg showed less active silica accumulation than forage growth, in contrast to more active silica accumulation than forage growth in Gd. It was suggested that the present methods accounted analytically for the accumulation characteristics of silica and its content changes with growth of forages.

Original languageEnglish
Pages (from-to)395-401
Number of pages7
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume43
Issue number3-4
Publication statusPublished - Feb 1 1999

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All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

Cite this

Shimojo, M., Bungo, T., Tobisa, M., Imura, Y., Koga, N., Shao, T., ... Masuda, Y. (1999). Analyses of accumulation of silica in the growth of two tropical forages using simple equations. Journal of the Faculty of Agriculture, Kyushu University, 43(3-4), 395-401.