Plant Analysis
Sufficiency Ranges for Field Crops*
| Crop |
Time/Sampling
Instructions |
N
% |
P
% |
K
% |
Ca
% |
Mg
% |
S
% |
Mn
ppm |
Fe
ppm |
B
ppm |
Cu
ppm |
Zn
ppm |
| Alfalfa |
Alfalfa Top 6"
of plant prior to blooming
/20-30 plants |
3.75-5.50 |
0.26-0.70 |
1.75-3.50 |
1.00-3.00 |
0.30-1.00 |
0.20-0.50 |
30-200 |
20-250 |
20-80 |
5-20 |
20-70 |
| Corn (seeding) |
Whole top up to 12"/5-10
plants |
3.50-5.00 |
0.30-0.50 |
2.40-4.00 |
0.30-0.70 |
0.15-0.45 |
0.20-0.50 |
20-300 |
50-250 |
5-25 |
5-20 |
20-60 |
| Corn (leaves) |
Leaf below whorl & ear
leaf at silking/10-20 leaves |
2.80-3.20 |
0.25-0.45 |
1.75-2.50 |
0.25-0.50 |
0.12-0.30 |
0.15-0.50 |
15-300 |
30-200 |
4-25 |
3-15 |
15-60 |
| Cotton |
Top mature leaves in June
or July/20-30 leaves |
3.50-4.50 |
0.30-0.50 |
1.50-3.00 |
2.00-3.00 |
0.30-0.90 |
0.25-0.80 |
25-300 |
50-250 |
20-80 |
5-25 |
20-200 |
| Forage Grasses
(coastal bermudagrass) |
Top 4-6" of
plant |
2.00-2.60 |
0.23-0.40 |
1.20-2.00 |
0.25-0.50 |
0.10-0.25 |
0.15-0.25 |
20-300 |
50-200 |
5-15 |
4-20 |
20-70 |
| Small Grain (wheat) |
Top 6" of plant
leaves prior to heading/GS=4-6 |
3.00-5.00 |
0.20-0.40 |
1.50-3.00 |
0.20-0.50 |
0.15-0.50 |
0.18-0.50 |
25-100 |
25-100 |
3-20 |
5-25 |
20-70 |
| Small Grain (wheat) |
Flag leaf at growth state
10+/30-40 leaves |
Sufficiency ranges
not established |
| Peanuts |
Top mature leaves prior to
or at bloom |
3.50-4.50 |
0.25-0.50 |
1.70-3.00 |
1.25-2.00 |
0.30-0.80 |
0.20-0.60 |
15-200 |
50-300 |
20-60 |
5-30 |
20-70 |
| Soybeans |
Top mature leaves prior to
or at initial pod filling/30-40 leaf blades |
4.25-5.00 |
0.25-0.50 |
1.70-2.50 |
0.45-1.50 |
0.25-0.80 |
0.20-0.60 |
15-200 |
50-300 |
20-60 |
5-30 |
20-70 |
| Tobacco |
Top mature leaves on vegetative
stem in June or July/4-8 leaves |
3.50-4.25 |
0.27-0.50 |
2.50-3.20 |
1.50-3.50 |
0.20-0.65 |
0.20-0.60 |
30-250 |
50-200 |
20-50 |
5-60 |
20-80 |
*Sufficienty
ranges are not absolute indicator of adequate nutrition. Nutrient
concentration is affected by plant part sampled, nutrient ratios,
age of tissue, varietal differences, weather conditions at
sampling, dust and pesticide residue on foliage, and other
factors affecting plant health (insects, nematodes, diseases,
etc.).
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