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Tables 2 and 3 in:


Stetina, S. R., Molin, W. T., and Pettigrew, W. T. 2010. Effects of varying planting dates and tillage systems on reniform nematode and browntop millet populations in cotton. Online. Plant Health Progress doi:10.1094/PHP-2010-1227-01-RS.



Table 2. Reniform nematode soil populations and root infection as affected by early (April) or normal (May) planting dates, conventional or minimum-till production systems, and four cotton cultivars.

Source Level Nematodes per
200 cm³ soil
Nematodes per
g of fresh root
2005 2006 2007 2005 2006
Tillage
(T)
Conventional 2557 3744 3270 209 95 a
Minimum-till 3089 3646 3782 193 52 b
F 4.43 0.14 3.18 0.14 6.07*
Date
(D)
Early 3042 3834 3834 109 b 171 a
Normal 2596 3561 3672 368 a 29 b
F 3.12 1.06 1.12 31.74*** 54.72***
Cultivar
(C)
DeltaPine 444 BGRR 2466 b 3420 3013 b 186 58
DeltaPine 555 BGRR 2638 b 4145 3451 ab 219 86
FiberMax 960 BGRR 3371 a 3727 3840 a 172 70
Stoneville 4892 BGRR 2845 ab 3528 3822 a 230 71
F 3.20* 1.49 3.14* 0.40 0.82
Season
(S)
Planting 2504 3191 b 3163 b    
Harvest 3155 4279 a 3909 a    
F 2.90 18.37*** 14.57***
T x D F 0.47 0.71 0.01 0.00 3.07
T x C F 0.96 0.46 0.83 4.61** 1.59
T x S F 14.75*** 0.72 4.04*
D x C F 2.16 0.68 1.43 1.72 0.33
T x D x C F 1.66 1.24 0.46 2.51 1.60
T x D x S F 2.00 0.00 6.87*
T x C x S F 0.75 0.24 1.83
D x C x S F 0.35 1.07 1.62
T x D x C x S F 0.15 0.87 1.31

 *, **, and *** indicate significance at the 0.05, 0.01, and 0.001 levels, respectively.

Within each year and parameter, values followed by the same letter are not significantly different from each other based on differences of least squares means (P ≤ 0.05).

Data presented are geometric means (backtransformed values).



Table 3. Browntop millet pressure in plots as affected by early (April) or normal (May) planting dates, conventional or minimum-till production systems, and four cotton cultivars.

Source Level Midseason weed count
(number per m²)
Late season weed cover
(% of plot area)
2005 2006 2007 2005 2006 2007
Tillage
(T)
Conventional 3.0 b 43.8 b 2.4 21.9 b 14.7 b 11.2 b
Minimum-till 19.2 a 415.8 a 3.2 53.3 a 40.8 a 23.9 a
F 9.14* 11.97** 0.25 22.26** 9.98* 14.43***
Date
(D)
Early 14.9 312.4 3.5 37.2 39.2 a 23.6 a
Normal 7.2 147.1 2.2 38.0 16.3 b 11.5 b
F 2.07 2.36 0.68 0.01 7.73* 13.05***
Cultivar
(C)
DeltaPine 444 BGRR 8.8 b 209.6 4.0 37.8 39.7 a 21.3 ab
DeltaPine 555 BGRR 5.0 b 145.1 1.5 34.7 14.4 b 3.3 c
FiberMax 960 BGRR 20.8 a 389.1 5.0 45.6 35.0 a 27.6 a
Stoneville 4892 BGRR 9.8 ab 175.3 0.9 32.2 21.9 b 18.0 b
F 3.07* 1.86 1.64 1.10 9.86*** 9.46***
T x D F 0.56 1.07 0.74 0.12 3.23 15.59***
T x C F 1.58 1.49 1.19 0.22 0.61 2.65
D x C F 0.74 2.37 1.73 2.08 4.15* 2.57
T x D x C F 1.38 1.93 0.33 1.52 1.55 1.92

*, **, and *** indicate significance at the 0.05, 0.01, and 0.001 levels, respectively.

Within each year and parameter, values followed by the same letter are not significantly different from each other based on differences of least squares means (P ≤ 0.05).




2010 Plant Management Network.