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Sampling PlantsKey to Stages of Growth
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| B | blade | L | leaf/leaflet | S | stem/midstem/seedling |
| C | center/cluster | M | midrib | T | tops |
| F | flag leaf | P | petiole | U | underground stem |
| H | hulls | R | root | W | whole above-ground portion |
Available List of Crop Codes
| ALFALFA | EBL-T (PT2) Top 6-inch |
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| [ EBL-C (SO4-S) [ center leaves |
+ EBL-S (PO4-P + K) + center stems |
+ EBL-W (B + Mo)] + whole top third ] |
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| ALMONDS / APPLES / PEARS / ASIAN PEARS / PLUMS / PRUNES / CHERRIES / APRICOTS / SHIPP APRICOTS / CANNG APRICOTS | MAR-L APR-L MAY-L MSN-L (Jun-Jul) LSN (Aug-Sep) HAR-H (boron in hulls) Select MRM leaves from non-fruiting, non-expanding spurs. |
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| ARTICHOKES | EBL-P FBL-P (midharvest) HAR-P (lower 6-inch petiole) HAR-L |
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| ASPARAGUS | MFG-T (top 12" of fern for total nutrients) MID-T (top 4" fern for NO3-N, PO4-P, K) |
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| AVOCADOS | LSN-L (mid Aug-mid Oct. Select 5 to 7 month old spring cycle terminal leaves) | ||
| BANANAS | HAR-L (center strip of 2nd to 3rd fully developed leaf from top) | ||
| BEANS | EBL-B (MRM leaf or blade) ESN-P PBL-P EBL-P |
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| BEET / TABLE | ESN-L (5 weeks after seeding) PRE-L (9 weeks after seeding) |
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| BLUEBERRIES | MSN-L (midshoot leaves off current season's growth, near/at harvest, Jun-Aug) | ||
| BROCCOLI | BUT-L ESN-M BUT-M PRE-M |
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| BRUSSELS SPRTS | MID-L or MID-M (midgrowth, early sprouts) PRE-M |
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| CABBAGE | HEA-L or HEA-M (2 to 3 month old wrapper leaves) |
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| CANEBERRIES / RASPBERRIES / BLACKBERRIES / BOYSENBERRIES | ESN-L (pre/early bloom) MSN-L (Jun-Aug) MRM leaves from laterals of primo canes. |
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| CARROTS | MSN-L (tallest leaf) MSN-P (petiole of tallest leaf) After 4" tall/60 days after seeding. |
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| CAULIFLOWER | BUT-L ESN-M BUT-M PRE-M |
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| CELERY / CELERIAC | MID-L or MID-P (4 to 6 weeks after seeding) MRM leaf, or petiole below 1st node. PRE-P (preharvest) Petiole above 1st node of MRM leaf. |
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| CHARD | ESN-L (5 weeks after seeding) PRE-L (9 weeks after seeding) |
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| CHESTNUTS | MSN-L (MRM leaves on current season's growth) |
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| CHINESE CABBAGE | HEA-L or HEA-M | ||
| CITRUS | LSN-L Select terminal spring-flush leaves from non-fruiting shoots in Sep-Oct. | ||
| CLOVER | EBL-T (top third of plant) | ||
| COFFEE | NON-L (non-bearing, 4th pair from tips) BEA-L (bearing branch, 4th pair from tips) Sample after flowering/before cherry ripening |
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| CONIFERS | No code except for seedlings. Select 3rd whorl or terminal 3" cuttings from current season's growth, 1/4 to 1/2 way down from top, mid Sep-mid Dec. S (whole seedlings, including washed roots, after mid Oct) |
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| CORN | ESN-W (6"-16" tall) whole seedling MSN-L (pretassel) 3rd leaf/45-80 days TAS-L (tasseling) opposite/below ear ESN-M (6"-12" tall) MSN-M (3-6 ft tall) TAS-M (tasseling-silking) Select basal 4-5" of midrib if requiring NO3-N, PO4-P, and K. |
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| COTTON | FSQ-P (PT5) EBL-P (PT5) Usually before early July FBL-P or FBL-L end July FOB-P (PT5) end August PRE-P (PT5) mid September Select from 4th to 5th node from top of plant at all stages of growth. |
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| CRANBERRIES | LSN-T (tops above fruiting uprights on current season's growth, mid-Aug to mid-Sep) | ||
| FEIJOAS / GUAVAS | MSN-L (3rd pair of leaves back from fruiting terminals, Jul-Aug) | ||
| FILBERTS /HAZELNUTS | MSN-L (MRM midshoot leaves from current season's growth, Jul) | ||
| FLOWERS | No code, but generally select MRM leaves. | ||
| GARLIC / CHIVES | ESN-L (before bulbing) BUL-L (bulbing) LSN-L (post-bulbing) Discard lower white section of MRM leaves. |
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| GINSENG | No code, but select MRM leaves. | ||
| GRAPES |
PBL-P or PBL-B or PBL-L Usually before May. Select petioles P, only from unshaded leaves.
BLM-P or BLM-B or BLM-L Select from opposite the basal cluster on new shoots.
MSN-P or MSN-B or MSN-L Berry filling. Select 2nd leaf away from last cluster.
VER-P or VER-B or VER-L Veraison (berry softening). Select 6th to 7th leaf from growing tip.
HAR-P or HAR-B or HAR-L Select MRM leaf, usually 6th to 7th leaf from growing tip. Petioles are better for determining sodium and chloride toxicities. Blades are better for determining boron toxicities. |
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| GRASS / PASTURE / TIMOTHY / ORCHARD GRASS |
No code, but select whole tops. | ||
| HOPS | JUN-P JUL-P AUG-P Select petioles from MRM leaves on main vine, 5 to 6 ft from ground. Sap will stain! |
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| KIWIFRUIT | MAY-P or MAY-L MSN-P or MSN-L NOV-P or NOV-L Select 1st to 3rd leaf beyond fruit, or mid-cane leaves on non-bearing vines. |
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| LETTUCE / ENDIVE | ESN-L or ESN-M (4th to 6th leaf stage) HEA-L or HEA-M HAR-L or HAR-M FES-M FHE-M FHA-M Select MRM leaves L, or midribs M. F = Fall planting |
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| LITCHI | No code, but select MRM leaves. | ||
| MACADAMIAS | No code, but select leaves from 2nd whorl below bud before new flush. | ||
| MELONS / CANTALOUPES / SQUASH / PUMPKINS / CUCUMBERS / CUCURBITS / WATERMELONS |
VEG-P/L EFL-P/L BUL-P/L HAR-P/L Select MRM leaves, 5th to 6th from growing tip. |
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| [GH CUCUMBER / GH LETTUCE] | [MRM-L] [GH = GREENHOUSE PRODUCTION] |
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| MINT | EBL-L Select leaves from top 6" of first unbranched stem. Test for total levels. ESN-S Test for nitrate nitrogen only. Select top 6" of first unbranched stem, stripped of leaves. MAY-S JUN-S JUL-S AUG-S |
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| NECTARINES / OLIVES / PEACHES / FREEST PEACHES / CLING PEACHES / PECANS / FIGS | MAR-L APR-L MAY-L MSN-L (June-July) LSN (Aug-Sep) Select basal to midshoot leaves/leaflets from current season's shoots. |
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| ONIONS | ESN-P or ESN-L (tallest leaf before bulb enlargement) MSN-P or MSN-L LSN-P or LSN-L ESN-R (washed roots before bulb enlargement) More reliable for NO3-N readings. |
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| ORNAMENTALS | No code, but select MRM leaves for general guidelines. | ||
| PALMS | No code, but select middle leaflets from MRM leaves, discarding the petiole/midrib. | ||
| PAPAYAS | PBL-P (when flower buds are just visible in the axil) | ||
| PARSLEY | No code | ||
| PEAS | EBL-L Select MRM leaves, usually 3rd to 5th from growing tips. |
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| PECANS | MSN-L (paired midshoot leaflets from non-fruiting shoots in July) | ||
| PEPPERS / GH PEPPERS |
VEG-P or VEG-L EFL-P or EFL-L EGF-P or EGF-L PRE-P or PRE-L MRM leaves [GH PEPPERS = MRM-L] |
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| PERSIMMONS | LSN-L (MRM leaves from non-fruiting shoots, Sep-Oct) | ||
| PINEAPPLES | EFL-L (leaf at early inflorescence, discarding white base) | ||
| PISTACHIOS | MAR-L APR-L MAY-L MSN-L (Jun-Jul) LSN-L (Aug-Sep) Select terminal leaflets |
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| POTATOES | ESN-P or ESN-L prebloom-50 days MSN-P or MSN-L fullbloom-70 days LSN-P or LSN-L 90 days Select MRM leaves, usually 4th to 5th from growing tip. |
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RICE/
WILD RICE
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MIT-L (35-55 days) May-June, After 5th leaf stage MAT-L (55-65 days) June-July Select MRM "Y" leaf. PAI-L (60-80 days) panicle initiation BOO-F (flag) Boot/heading Leaf below ear |
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| ROSEMARY | No code, but select 2" to 3" terminal cuttings in summer. | ||
| SAFFLOWER | L (midstem leaves) To determine total levels of nutrients. ESN-S (8"-12" bolted) PBL-S EBL-S Select stem half way down, discarding leaves. |
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| SORGHUM | ESN-W (12" tall) MSN-L (37-65 days) HEA-L (2nd to 3rd leaf below head) |
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| SPINACH | ESN-L (30-50 days) PRE-L |
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| STRAWBERRIES | MSN-P or MSN-L (early fruiting stage) MSN-B for SO4-S |
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| SUDAN GRASS | No code, but select whole tops, 5 weeks between clippings. | ||
| SUGARBEET | ESN-P 6"to 8" growth MSN-P or MSN-B PRE-P 5 to 6 weeks prior to harvest |
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| SUGARCANE | MSN-L (4th to 6th leaf from top) MSN-N (discard midrib for nitrogen, N) |
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| SUNFLOWERS | PBL-L (3rd to 4th leaf below flower bed) | ||
| SWEET POTATOES |
MSN-P or MSN-L (MRM leaves during first half of growing season)
Also VEG-P (vining) and BUL-P (root bulking) but for NO3-N only
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| SWEET CORN | TAS-L (6th leaf from base) SIL-L (leaf opposite 1st ear) For total levels. ESN-M (6" to 12" tall) MSN-M (3 to 6ft tall) TAS-M (tasseling-silking) Select basal 4" to 5" of midrib for NO3-N, PO4-P, and K. |
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TOMATOES / CANNG / PR / CH / FM / GR / TRELLIS ALSO EGGPLANTS*
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VEG-P or VEG-L
EFL-P or EFL-L EGF-P or EGF-L (1" diam) ERF-P or ERF-L (10-20% red) Also FRF-P (full ripe, for fresh market tomatoes - FM TOMATOES)
GH TOMATOES = MRM-L
[GH = GREENHOUSE PRODUCTION]
* But only MRM-B at 1st small fruit.
Select MRM leaves, usually 4th to 5th from top, or opposite top cluster.
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| TURF | No code, but specify variety for accurate ratings. | ||
| WALNUTS | MAR-L APR-L MAY-L MSN-L (June-July) LSN-L (Aug-Sept) Select terminal leaflets from non-fruiting fully expanded spur leaves. |
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WHEAT / BARLEY / OATS
GRAIN/MIXED GRAIN
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ESN-W or ESN-U (3rd to 4th leaf stage) TIL-S JNT-T or JNT-S BOO-T or BOO-S HEA-T W = whole tops U = 2"stem underground S = 2" stem aboveground T= top 4 leaves |
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CAUTION! Official ratings for elements other than NO3-N, PO4-P, and soluble K on petioles or midribs may not exist. Therefore, interpret with caution when requesting the PT2 or PT5A package.