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table L.-.~a1ua[lon of za uiva :znav ui re ie rer.cz a111e'and ore mino •Ceas over throe years on C':o u!anc ronouni[izs usir.e hvpo[husls Cesring at a 9U: curs!de nee !e vr.1. Z:ie du [a are iron a coal sur- face ml ne :n ;:o r[Y:usc Colo ru du aad :et le CL pruduc[:on of herba- ceous pl ants. Sear Ro: xr so fla: z r t x p 1980 Refe rz me area xr 16.42 g/ m2: Pre¢Sne area ip 15.67 B/!, m2; z x Z r - P 2 2 s s r+~ n n r p 1981 1982 cun-ur.i ry Z 90 = + 1.645 Aecep[ Ao: x ° x r p s~ - 194.12; nr 143 s~ 131.33; np = 47 = 0.366 Reference area zr = 19.26 g1 ZmZ; sr 746.71; nr = 150 Premine area :p = 14.13 g/4m2; sP = 83.54; np = 61 x _ is Z = 2 2 = c.o3L sr ~ - + n n [ p Z 90. + 1.645 Rej ec[ Ho: x = x r p x _ x Z 2 2 = 0.'_19 sr s -+~ n n r p 2 .90 = + 1.645 Atcc p[ Ho: x x r p Reference area xr = 29.35 gl'c m2; s~ = 332.53; nr 145 Pre mLne area xp - 30.04 g/!~m2; sP 359.10; np 47 1 Aypo[hcs is testing orocedure iron Mz ndc nhall (1915). Ra: iir a z P Reference area zr = 57.45 g/m2; s~ _ (,006.05; nr 120 Premine area zp = 50.97 g/m2; aP 1,120.91; np 40 x _ 'x Z =' s2 sZ = 1.067 r { ~ n n r p Z 90= + 1.645 Accept Ho: xr ° xp Reference area zr = 69.09 g/m2; s~ 1,166.63; nr ° 153 Premine area xp ° 55.53 g/m sP = 1,435.65; np 60 z z r 7 Z = - - 2.414 6 5 nr + P 2.90° + 1.645 Reject Ho: x ° z r p Reference area 2 2 zr 84.48 g/m sr = 1,562.06; nr ll8 Premine area zp ° 77.00 g/m2; sP ° 2,685.31; np ° 45 x _ x Z 2 ~ 0.375 s s~ r + 3 n n r p Z.90° + 1.645 Accept Flo: zr ° zp _ ~ ~_