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Field Crops
For field crops take samples from at least 50 plants collected randomly from across the field. Use the chart below to find the right time to sample, as you want your samples to be compared to the standard values.
Recommended Timing and Plant Parts for Tissue Sampling
Corn |
3-5 leaf stage silking |
Whole plant (zinc & phosphorus only) middle third or ear leaf |
Soybeans |
First flowering |
Top fully developed leaf (3 leaflets + stem) |
Cereals |
At heading |
Top 2 leaves |
Forages |
Late bud |
Entire above ground portion |
Edible beans |
First flowering |
Top fully developed leaf (3 leaflets + stem) |
Potatoes |
Early, mid or late season |
Petiole of 4th leaf from tip |
Tomatoes |
Early bloom |
Petiole of 4th leaf from tip |
Broccoli, cauliflower |
Start of head formation |
Midrib of young, mature leaf |
Cabbages |
At heading |
Midrib of wrapper leaf |
Carrots |
Mid-growth |
Petiole of young, mature leaf |
Celery |
Mid-growth |
Petiole of newest elongated leaf |
Lettuce |
At heading |
Midrib of wrapper leaf |
Onions |
Minimum of 3 times per season |
Tallest leaf |
Spinach |
Mid-growth |
Petiole of young, mature leaf |
Sugar beets |
12 weeks |
Youngest mature leaf |
Tree fruits |
Last two weeks of July |
Fully expanded leaves from mid-point of current year's growth |
Blueberries |
Mid August |
Fully expanded mature leaves, including petioles |
Grapes |
September 1-15 |
Petioles (leaf stalks) from leaf opposite bunch |
Raspberries |
Recently matured |
Fully expanded leaves |
Strawberries |
Late June for fruiting
Mid August for non fruiting plantings |
Fully expanded recently matured leaflets only (discard petiole) |
Tobacco |
At topping |
10th leaf from top |
Leaf & Plant Tissue Analysis
Nitrogen (N), Calcium (Ca), Phosphorus (P), Potassium (K),Magnesium (Mg), Sodium (Na), Iron (Fe), Copper (Cu), Manganese (Mn), Zinc (Zn) and Boron (b) |
Please contact the laboratory for additional tests and prices.
Please enclose payment with samples
Download Submission Form
Effective August 20, 2015
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