Nitrogen Availability and Uptake by Sugarbeet in Years Following a Manure Application
Table 3
The influence of treatment on N uptake in 2007 sugarbeet plant components. Table gives values for treatment effects, and single-degree-of-freedom orthogonal comparisons derived from an analysis of variance.
N uptake by beet biomass components
Source of variation
Tops
Roots
Whole plant
1 June
13 July
20 Aug
27 Sept
1 June
13 July
20 Aug
27 Sept
1 June
13 July
20 Aug
27 Sept
values
Treatment (TRT)
*
***
***
***
*
**
***
***
*
***
***
***
Orthogonal contrasts†
No manure versus manure
0.26
0.25
0.78
0.52
0.38
0.35
0.75
0.7
0.65
0.26
0.9
0.6
Man-1x versus Man-3x
***
*
***
*
**
0.08
***
**
***
*
***
*
Man: y1 versus y2 & y3
0.9
***
*
0.15
0.87
***
**
0.11
0.9
***
*
0.09
Man y2 & y3: m1 versus m3
**
**
***
*
*
0.06
***
**
**
**
***
**
†No manure: NEFert + control + Fert; Man: manure = m1 + m3 where m1: manure-1x; m3: manure-3x; y1, y2, y3: fall manure applied 1, 2, and 3 years in the past, respectively.
*
< 0.05, ** < 0.01,*** < 0.001.
