Effects of soil acidity on the growth of sericea lespedeza
Titel:
Effects of soil acidity on the growth of sericea lespedeza
Auteur:
Cline, Gary R. Silvernail, Anthony F.
Verschenen in:
Journal of plant nutrition
Paginering:
Jaargang 20 (1997) nr. 12 pagina's 1657-1666
Jaar:
1997-12
Inhoud:
Field experiments were conducted in 1992 and 1993 to examine effects of soil acidity on growth and N2 fixation by “Serala”; sericea lespedeza [Lespedeza juncea (L.F.) var. sericea (Mig.)]. Effects of acidified soil on N2 fixation could not be determined because nodulation was suppressed, apparently by sufficient availability of N. Apparently-suppressive, mean 1993 levels of KCl-extractable NH4 and NO3 in zero nitrogen (N) control treatments were 20 and 13 mg-kg-1, respectively. In soil acidified with sulfur (S), growth of sericiea lespedeza was significantly reduced (PO.05) when the concentration of water-extractable Mn exceeded 1.3 mM or calculated Mn2+ activity exceeded 0.4 mM. This occurred at pH values of 4.1 to 4.3 depending on S treatment. At a given value of pH, shoot dry weight production was greater in S-amended soil than in Al2SO4-amended soil. Reduced growth in the latter did not appear to be directly related to higher measured levels of toxic Al but may have been caused by a combination of aluminum (Al), hydrogen (H), manganese (Mn), and phosphorus (P) effects. Lespedeza growth was lowest in nonacidified soil with pH values near 6.0, indicating a preference for acid soils by the variety “Serala.”; The demonstrated tolerance of sericea lespedeza to acid soils make it a valuable reclamation species. However, Mn may inhibit growth in acidic soils when the activity of water-extractable Mn2+ exceeds 0.4 mM, and it may not fix appreciable N2 unless available soil N is quite low.
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