Chemists & Consultants

Sampling GuideSampling Guide
Sampling Techniques for Soil and Plant Tissue

Analytical Catalog
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Tissue: Field & Row Crops

Crop Plant Part to Sample Time of Sampling
Alfalfa Midstems for NO3-N, PO4-P, K
Leaves for SO4-S
Tops for Mo, B
1/10 Bloom
Asparagus Fern needles 4" tip section September
Cabbage/Lettuce Midrib of wrapper leaf Heading
Cantaloupe/Cucumber Petioles of 6th leaf/ from
growing tips 6-8 true leaves
Early fruit set
Corn Midrib from young mature leaf
Midrib from leaf opposite ear
Leaf - young mature
Leaf opposite ear
Before ear formation
After ear formation
Before ear formation
After ear formation
Cotton Young, mature petiole June thru Sept 15
Onion/Garlic “Y” leaf from 6” plant
height to pre-harvest
Sorghum/Milo Young mature leaf Pre-harvest
Tomato Petiole of recently matured leaf (4th leaf from growing tip) Early Bloom, 1" Fruit, lst Color
Wheat/Barley 2” of above-ground stem 6” tall to pre-harvest