Nitrogen Availability and Uptake by Sugarbeet in Years Following a Manure Application
Table 4
Accumulated total biomass and N uptake in sugarbeet (tops and roots) at four times during the 2007 growing season.
Treatment†
Biomass
N uptake
1 June
13 July
20 Aug
27 Sept
1 June
13 July
20 Aug
27 Sept
Mg ha−1 (dry wt.)
Kg ha−1
No manure
NE-Fert
0.15a‡
7.3ab
17.5a
25.0bc
6.57a
124.6ab
183.8ab
257.4ab
Control
0.06b
4.2b
10.4c
17.1c
2.81b
52.7b
103.1b
152.5b
Fert
0.10ab
8.4a
20.9a
30.6a
4.85ab
164.6a
288.4a
383.3a
Manure-1x
m1-y1
0.07ab
8.0a
18.2ab
25.3ab
3.18ab
140.3a
201.6ab
268.4ab
m1-y2
0.08ab
4.8b
12.1bc
21.8ab
3.6ab
62.6b
119.4b
211.0b
m1-y3
0.07b
4.1b
11.7bc
17.3c
2.98ab
56.4ab
123.2b
151.4b
Manure-3x
m3-y1
0.13ab
7.6a
19.6a
24.8abc
5.89ab
140.5a
251.8a
300.2ab
m3-y2
0.13ab
7.0ab
18.4a
25.3ab
5.86ab
118.6ab
236.8a
315.4ab
m3-y3
0.13ab
6.0ab
17.3a
22.7b
5.44ab
92.4ab
211.4a
252.6ab
Treatment classes for orthogonal contrasts
No manure
0.10
6.6
16.2
24.1
4.7
114.0
189.4
262.9
Manure
0.10
6.3
16.2
22.8
4.5
101.8
191.1
246.2
Manure-1x
0.07b
5.6b
14.0b
21.5b
3.3b
86.4b
146.9b
207.6b
Manure-3x
0.13a
6.9a
18.4a
24.1a
5.7a
117.2a
235.2a
284.8a
Manure Year-1
0.10
7.8a
18.9a
24.8
4.5
140.4a
227.8a
273.4
Manure Year 2 & 3
0.10
5.5b
14.9b
21.8
4.5
82.5b
172.7b
232.6
Year 2 & 3: m1
0.08b
4.5b
11.9b
19.6b
3.3b
59.5b
121.3b
181.2b
Year 2 & 3: m3
0.13a
6.5a
17.85a
24.0a
5.65a
105.5a
224.1a
284.0a
†NE-Fert: noneroded fertilizer (all other treatments on eroded soil); m1: manure-1x; m3: Manure-3x; y1, y2, y3: fall manure applied 1, 2, and 3 years in the past, respectively; manure: m1 + m3; no manure: NEFert + Control + Fert. ‡ Within a given plant component and sample date, treatment means followed by the same lower case letter are not significantly different (). Not displayed if effect was not significant in the ANOVA (Table 5).
