Nitrogen Availability and Uptake by Sugarbeet in Years Following a Manure Application
Table 5
Treatment and orthogonal contrast mean values for sugarbeet yield, quality, and gross margin parameters.
Treatment†
Clean beet root yield‡
Sugar
Est. Recov. sugar‡
Brei nitrate
Brei conductivity
Gross margin§
Mg ha−1
%
Mg ha−1
mg kg−1
dS m−1
$US ha−1
No manure
NE-Fert
75.2c§
17.7a
11.6ab
59.8c
0.58d
979bc
Control
56.4c
17.6a
8.5b
106.8c
0.68cd
292 d
Fert
90.2ab
16.4b
12.3ab
187.3bc
0.88bc
1272ab
Manure-1x
m1-y1
101.0a
16.7ab
14.0a
147.1bc
0.91b
1884a
m1-y2
72.8bc
16.8ab
10.4ab
143.6bc
0.77bcd
731bcd
m1-y3
64.5c
16.8ab
9.1b
185.4bc
0.81bc
484cd
Manure-3x
m3-y1
97.7a
16.8ab
13.6a
149.1bc
0.95b
1676a
m3-y2
101.1a
16.0b
13.2a
259.6ab
0.96b
1510ab
m3-y3
88.5ab
15.6b
11.2ab
308.5a
1.02a
1138b
Treatment classes for contrasts
No manure
73.9b
17.2a
10.8
118.0b
0.71a
848b
Manure
87.6a
16.5b
11.9
198.9a
0.90b
1237a
Manure-1x
79.4b
16.8a
11.2b
158.7b
0.83b
1033b
Manure-3x
95.8a
16.1b
12.7a
239.1a
0.98a
1441a
Manure y1
99.4a
16.8a
13.8a
148.1b
0.93
1780a
Manure y2 & y3
81.7b
16.3b
11.0b
224.3a
0.89
966b
Year 2 & 3: m1
68.7b
16.8a
9.8b
164.5b
0.79b
607b
Year 2 & 3: m3
94.8a
15.8b
12.2a
284.1a
0.99a
1324a
m1-y1, m3-y1, m3-y2
99.9a
16.5b
13.6a
185.3
0.9a
1690a
NE-Fert, Fert
82.7b
17.1a
12.0b
123.6
0.7b
1126b
†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. ‡Clean yield: yield minus soil tare; Est. Recov. Sugar: estimated amount of sugar extractable from beets per unit area. §Gross margin: gross revenue minus operating costs. ¶For a given yield or quality parameter, treatment means or means for individual orthogonal contrasts followed by the same lower case letter are not significantly different (). Not displayed if effect was not significant in the ANOVA.
