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Table 2 Class means and contrasts of class for fresh yield and dry matter yield of lettuce grown in Soil 1 and 2 for two growing cycles

From: Effect of biochar derived from faecal matter on yield and nutrient content of lettuce (Lactuca sativa) in two contrasting soils

Class comparison Soil 1 Soil 2
Fresh yield Dry matter yield Fresh yield Dry matter yield
GC1a GC2 GC1 GC2 GC1 GC2 GC1 GC2
Classes g/pot
Control 154 123 9.5 7.4 28 30 1.8 2.0
N alone 137 128 8.2 7.7 37 32 2.4 2.3
Biochar alone 198 163 11.7 9.7 115 87 7.0 5.5
Biochar with N 230 161 13.4 9.4 138 90 8.2 5.5
Contrastsb         
 Control versus biochar alone *** *** *** *** *** *** *** ***
 Control versus N alone ns ns ns ns ns ns ns ns
 Biochar alone versus N alone *** *** *** *** *** *** *** ***
 Biochar with N versus biochar alone *** ns *** ns *** ns *** ns
 Biochar with N versus N alone *** *** *** *** *** *** *** ***
  1. aGC1 = Growing Cycle I and GC 2 = Growing Cycle II
  2. bClasses compared comprise the following treatments: control = control; biochar alone = biochar alone treatments (10, 20 and 30 t ha−1)
  3. N alone = N alone treatments (25, 50 kg N ha−1); biochar with N = combination of the different biochar rates with the two N levels
  4. ns, not significant (P > 0.05); * P < 0.05; ** P < 0.01; *** P < 0.001), n = 5