CP Phase III Final Report 1991_Part 2.pdf - Lee Daniels - Soil and ...

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Table 19. Annual nitrogen uptake by fescue growing on mine soils ofthe controlled overburden placement experiment.Treatment1982 1983year1984 1987 1989------------------ kgfha N ------- - ----------Rock Mix ExperimentSandstone (SS)1:1 SS:SiSSiltstone (SiS)62.la60.2a33 .3b60.4a77 .Sa53.8a39.2a40.0a34 . 6a32 .7a36.4a28. 9a19.8a34.9b25 . 9abSurface Amendment ExperimentControl (2:1 SS:SiS)Topsoil (30 em)Sawdust (112 Mg/ha)Sludge (56 Mgfha)Sludge (112 Mgfha)49 . 6a 76.6a 9 .3a50.3a 53.la lS.Oa34.2a 67.4a 26.3a118 .1b 214.6b 52.6b165.6b 284.2b 74.2b18 .1a26. 2ab23. 9ab37.4bc42.2c26.8a46. 6ab36 .Oab70.9b58 . labCo lumn means followed by different letters by experiment aresignificantly different (P- 0.05, Fisher's LSD) .46
treatments in 1982, 1983, and 1987 .By 1989 , N content of fescue grown onthe siltstone treatment was significantly higher.Some of this increasein fescue N may have resulted from weathering and subsequent availabilityand uptake of geologically fixed N in the siltstone parent mat erial,although the plant-availability of this fixed N is generally thought to bequite low.Because of higher yields, N uptake was initially higher in thepure sandstone and mixed treatments . By 1989, higher fescue N contentsresulted in N uptake levels being highest on the pure siltstone treatment .In the surface amendment experiment, fescue N content increased from1982 to 1987, with a decline in 1984 apparently caused by N immobilizationin biomass .Fescue N content dropped slightly in 1989, and was comparableto 1989 levels for the rock mix experiment. For the first three years,s ludge amended plots had higher fescue N content than the control, topsoiland sawdust plots. Although fescue N content in 1987 was notsignificantly different between the surface amendment treatments, in 1989the control treatment h a d t h e lowest fescue N content and t he highestfescue N levels were found in the 112 Mg(ha sludge treatment.Because of high yields and high N levels, the sludge amended plots hadt he highest N uptake levels during the first three years of the study.Inall years, however, at least one of the sludge t reatments hadsignif icantly higher N uptake levels t han those of the control plots.Extractable PhosphorusExtractable P l evels in t h e s urface (0 - 5 em) l ayer of t he rock mixexperiment were highest during the first year of the study and lowest in47
Page 1 and 2: FINAL REPORTTHE EFFECTS OF CONTROLL
Page 3 and 4: Table 15. Annual standing biomass p
Page 5 and 6: applied to spoils with the same mix
Page 7 and 8: Table 17. Total nitrogen content of
Page 9: Table 18. Nitrogen content of tall
Page 13 and 14: 1~87, the last year that they were
Page 15 and 16: Table 21. Phosphorus content of tal
Page 17 and 18: highest in the mixed sandstone/silt
Page 19 and 20: . Table 24. Levels of K, Ca, and Mg
Page 21 and 22: those reported elsewhere in this re
Page 23 and 24: . Table 26. Sufficiency/toxicity le
Page 25 and 26: . Table 27. Metal content of tall f
Page 27 and 28: Mn was not significantly different
Page 29 and 30: the control, topsoil, and sawdust p
Page 31 and 32: experiment, Mn and Fe concentration
Page 33 and 34: Table 31. Average tree height, grou
Page 35 and 36: adequate levels of nutrition for lo
Page 37 and 38: SUMMARY AND CONCLUSIONSThe overall
Page 39 and 40: weathering below the natural soil p
Page 41 and 42: designated topsoil substitute, grad
Page 43 and 44: Sci. Soc. Amer. J. 52 : 716-723 ..
Page 45 and 46: Site: Plot 9Parent Material: Siltst
Page 47 and 48: Site: Plot 21Parent Material: Topso
Page 49 and 50: Site: Plot 26Parent Material: Contr

CP Phase III Final Report 1991_Part 2.pdf - Lee Daniels - Soil and ...

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