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( NOTE: See individual Crop Files for detailed sampling instructions and analysis interpretations.)
| Crop | Growth Stage to Sample | Plant Part to Sample* | Number to Sample |
| Almond (Prunus dulcis, Crop File 1.03.125) | |||
| Mid-season (June-July) | Leaf, current terminal shoot | 80 - 100 | |
| Apple (Malus domestica, Crop File 1.03.135) | |||
| A. Young non-bearing trees | |||
| Mid-season (mid-July to mid-August) | Leaf, new growth | 80 - 100 | |
| B. Fresh market | |||
| Mid-season (8 to 10 weeks after full bloom) | Leaf, new growth | 80 - 100 | |
| C. Processing | |||
| Mid-season (8 to 10 weeks after full bloom) | Leaf, new growth | 80 - 100 | |
| Cherry (Prunus avium, Crop File 1.03.220) | |||
| A. Sweeta | |||
| Mid-season, 60-70 days after petal fall | Leaf, new growth | 60 - 100 | |
| B. Sourb | |||
| Mid-season, 60-70 days after petal fall | Leaf, new growth | 60 - 100 | |
| Grapefruit Citrus paradisi, Crop File 1.03.365) | |||
| Spring cycle trees (Sept-Oct) | Terminal leaf, non-fuiting shoots | 50 - 60 | |
| Lemon (Citrus, limon, Crop File 1.03.520) | |||
| Spring cycle trees (Sept-Oct) | Terminal leaf, non-fuiting shoots | 50 - 60 | |
| Nectarine (Prunus persica, Crop File 1.03.635) | |||
| A. Northern zones (NE & NW U.S., southern Canada) | |||
| Mid-season (60 to 70 days after petal-fall) | Mid-shoot leaf | 60 - 100 | |
| B. Southern zones (SE & SW U.S.) | |||
| Mid-season (60 to 70 days after petal-fall) | Mid-shoot leaf | 60 - 100 | |
| Olive (Olea europeae, Crop File 1.03.662) | |||
| Summer growth | Mid-shoot leaf | 60 - 100 | |
| Orange (Citrus sinensis, Crop File 1.03.677) | |||
| Navel, Valencia | |||
| Spring cycle trees (Sept-Oct) | Terminal leaf, non-fuiting shoots | 50 - 60 | |
| Peach (Prunus persica, Crop File 1.03.720) | |||
| A. Northern zones (NE & NW U.S., southern Canada) | |||
| Mid-season (60 to 70 days after petal-fall) | Mid-shoot leaf | 60 - 100 | |
| B. Southern zones (SE & SW U.S.) | |||
| Mid-season (60 to 70 days after petal-fall) | Mid-shoot leaf | 60 - 100 | |
| Pecan (Carya illinoinensis, Crop File 1.03.730 | |||
| 8 to 12 weeks after catkin fall | Leaflet pair, new growth | 50 | |
| Pistachio (Pistacia vera, Crop File 1.03.743) | |||
| Month prior to harvest | Leaflet pair, terminal growth | 60 | |
a includes important sweet cherry cultivars include Bing, Rainier, Brooks, Tulare, and King)
b important sour cherry cultivars include Nanking and Evans)