Agriculture Reference
In-Depth Information
Broccoli (c.v. “Ironman”) was grown in two systems: Early- and late-
harvest, which was followed by spring wheat production in the subsequent
year. The experimental design was a randomized complete block with four
replications within the early- and late-broccoli systems. Nitrogen was uni-
formly hand-applied at the typical grower rate of 342 kg N ha
-1
as urea,
and incorporated by disking before broccoli was mechanically transplant-
ed on May 23 and 17 for the early system and June 23 and 23 for the late
system in 2009 and 2010, respectively. Early- and late-broccoli systems
were grown in the same fi eld, but considered as separate research trials.
Typical management practices were followed for pre-plant fertilization of
macronutrients, plant spacing (75 cm between rows and 30 cm between
plants), insecticide application (Lambda-Cyhalothrin (13.1%) 19 mL ha
-
1
), and drip irrigation, as required. Temperature and precipitation data were
obtained by the on-site weather station (Table 2).
TABLE 2:
Monthly total precipitation and mean temperature and the 30-yr mean at
Ridgetown, ON, Canada, during 2009-2011.
Total precipitation (mm)
Mean temperature (°C)
2009
2010
2011
30 yr
mean
2009
2010
2011
30 yr
mean
January
147
227
61
61
-10.1
-5.5
-7.5
-3.7
February
106
98
137
54
-3.8
-4.8
-6.1
-2.4
March
106
67
88
60
1.1
3.4
-0.3
2
April
152
63
134
78
7.8
9.8
6.6
8.3
May
49
114
153
75
13.0
14.4
14.0
14.8
June
65
97
75
83
17.3
19.3
18.8
20.2
July
31
121
70
86
18.5
22.6
23.5
22.5
August
92
19
70
86
19.6
21.2
20.5
21.4
September
36
80
135
93
16.1
16.2
16.5
17.6
October
70
78
79
69
8.6
10.8
10.4
11.2
November
30
92
140
75
6.2
4.2
6.9
4.8
December
138
45
86
67
-2.5
-4.8
1.6
-1.2
Total
1022
1101
1228
887
