A) Main Effect of Nitrogen Fertiliser, Across Wheat Cultivars (Excluding the Unplantedreatment
Accessory Table 3Main effects on final populations (Pf)of Pratylenchus thornei after growth of four wheat cultivars for 8 to 20 weeks with six rates of nitrate fertiliser. Values are ln(x+1) means for main effects of wheat cultivars or nitrogen fertilisers with relevant l.s.d. (P=0.05) for each harvest time; interactions between cultivars and nitrogen fertilisers were statistically non-significant. Back-transformed values are presented graphically in Fig. 7.
(a) Main effect of nitrogen fertiliser, across wheat cultivars (excluding the unplantedreatment)
Fertiliser / Time (weeks)(mg N/kg soil) / 8 / 12 / 14 / 16 / 18 / 20
Final populations (Pf), ln (P. thornei/kg soil +1)
0 / 8.75 / 9.46 / 9.62 / 9.81 / 9.60 / 9.81
50 / 8.77 / 9.48 / 10.15 / 10.44 / 10.80 / 10.56
100 / 8.78 / 9.57 / 10.26 / 10.98 / 10.88 / 10.72
200 / 8.58 / 9.80 / 10.43 / 10.51 / 11.47 / 10.60
split 200 / 8.78 / 9.56 / 10.52 / 10.74 / 11.13 / 10.70
400 / 8.61 / 9.39 / 10.61 / 10.91 / 11.08 / 10.69
l.s.d. (P=0.05) / n.s. / n.s. / 0.53 / 0.61 / 0.49 / 0.36
(b) Main effect of wheat cultivar, across nitrogen treatments (excluding the aldicarb treatment)
Wheat / Time (weeks)cultivar / 8 / 12 / 14 / 16 / 18 / 20
Final populations (Pf), ln (P. thornei/kg soil +1)
Unplanted / 8.68 / 8.31 / 8.57 / 8.47 / 8.40 / 8.30
Gatcher / 8.43 / 8.89 / 9.70 / 9.80 / 10.50 / 10.13
GS50a / 8.76 / 8.97 / 9.49 / 10.16 / 10.00 / 10.05
Potam / 9.09 / 10.28 / 10.96 / 11.27 / 11.19 / 10.47
Suneca / 8.56 / 10.24 / 11.20 / 11.39 / 11.79 / 11.77
l.s.d. (P=0.05) / 0.20 / 0.36 / 0.49 / 0.55 / 0.45 / 0.33