Foliar Potassium Fertilizer Additives Affect Soybean Response and Weed Control with Glyphosate
Table 5
Soybean leaf tissue K, S, B, and Cu concentrations 14 days after treatment at Novelty and Malden in 2004 and 2005. Data were combined over site-years.
Fertilizer additivea
Rate (Kg K ha−1)
K
S
B
Cu
Weed-free
Glyphosate tank mixture
Weed-free
Glyphosate tank mixture
Weed-free
Glyphosate tank mixture
Weed-free
Glyphosate tank mixture
(g kg−1)
(mg kg−1)
Non-treated
21.4
2.6
42.0
9.2
Weed-free
22.4
—b
2.7
—
39.2
—
10.4
—
NISc
—
22.3
—
2.7
—
39.8
—
9.3
NIS + DAS
—
21.2
—
2.7
—
39.5
—
9.1
2.2
21.6
21.7
2.8
2.7
40.5
38.0
9.8
9.1
0-0-62-0
8.8
21.3
21.5
2.8
2.7
37.7
36.4
10.1
9.4
17.6
22.9
21.9
2.7
2.7
37.0
35.6
10.1
9.4
2.2
22.7
22.7
2.8
2.8
41.4
39.9
9.9
9.6
3-18-18-0
8.8
22.1
21.8
2.8
2.8
39.6
40.1
9.7
9.5
17.6
22.7
21.6
2.8
2.7
38.1
37.4
9.7
9.3
2.2
22.5
20.6
2.8
2.7
38.9
37.3
10.4
9.0
0-0-25-17
8.8
22.0
21.7
2.8
2.7
38.8
35.7
10.0
9.6
17.6
22.0
22.9
2.8
2.7
37.5
36.9
10.0
9.4
2.2
23.0
22.7
2.8
2.7
37.4
37.2
9.9
9.4
5-0-20-13
8.8
23.5
21.3
2.8
2.7
38.7
36.5
10.0
9.3
17.6
23.0
21.5
2.8
2.7
39.3
36.2
10.1
9.4
LSD (P = 0.01)
1.8
0.2
3.8
1.1
aFertilizer additives included 3-18-18-0 (N-P-K-S), K phosphate + urea (NA-CHURS/ALPINE); 0-0-25-17, K thiosulfate; 5-0-20-13, K thiosulfate + urea-triazone (Trisert-K, Tessenderlo Kerley); and 0-0-62-0, potassium chloride. All tank mixtures with glyphosate included non-ionic surfactant.
bTreatment was not included.
cAbbreviations: DAS: diammonium sulfate; NIS: non-ionic surfactant.
