AGRONOMIC CROPS	Stage of Growth	Plant Part to Sample	Number of Plants or Leaves to sample
Alfalfa	Prior to or at 1/10 bloom stage	Mature leaf blades taken from the top 4 to 6 inches of the plant	40-50
Clover and Other Legumes	Prior to bloom	Mature leaf blades taken about 1/3 of the way down from top of the plant.	40-50
Corn	1) Seeding stage (less than 12")	All the above ground portion	15-20
	2) Prior to tasselling	The first fully developed leaf below the whorl	15-20
	3) From tasselling and shooting to silking	The entire leaf at the ear node (or immediatley above or below it).	15-20
	Sampling after silking occurs is not recommended
Cotton	Prior to or at first bloom or when first squares appear.	Youngest fully mature leaves on main stem	30-40
Hay, Pasture or Forage Grasses	Prior to seed head emergence or at the optimum stage for best quality forage	Top 6 inches of plant	40-50
Peanut	Prior to or at bloom stage.	Mature leaves from both the main stem and either cotyledon lateral branch	40-50
Sorghum-milo	Prior to or at heading	Second leaf from top of plant	15-25
Soybean or other beans	1) Seedlings stage (less than 12")	All the above ground portion	20-30
	2) Prior to or during initial flowering	Two or three fully developed leaves at the top of the plant	20-30
	Sampling after pods begin to set not recommended.
Tobacco	Before bloom	Uppermost fully developed leaf.	8-12
Turf	During normal growing season; at least two days regrowth	Leaf blades. Clip by hand to avoid contamination with soil or other material.	1/2 pint of material
Wheat	1) Tillering (GS-3) to just prior to heading (GS 10-boot stage)	All above ground portion	30-40
	2) Just prior to heading (GS 10)	Flag leaf	40-50
	Sampling after heading not recommended.
FRUITS AND NUTS	Stage of Growth	Plant Part to Sample	Number of Plants or Leaves to sample
Apple	8 to 10 weeks after full bloom	Healthy mid-terminal leaves of current season's growth, taking 4 to 8 leaves per tree.	50-100
Apricot, Almond, Cherry, Pear, Prune	Mid Season	Healthy mid-terminal leaves of current year's growth or spurs.	50-100
Blueberry, Rabbiteye	First two weeks after harvest	Mature leaves from mid-portion of current season's growth	25-40
Grape	End of bloom period	Petioles from leaves adjacent to fruit clusters.	60-100
Grape, Muscadine	Mid to late summer but prior to final swelling of fruit	Most recent mature leaves adjacent to fruit clusters.	25-30
Peach	12 to 14 weeks after bloom	Mature leaves from mid-portion of near base of current season's terminal growth, taking 4 to 8 leaves per tree.	50-100
Pecan	56 to 84 days after catkin fall; July 7 to August 7	Middle pair of leaflets from midportion of terminal growth	100
Raspberry	Mid season	Youngest mature leaves on laterals or "primo" canes	20-40
Strawberry	4 to 5 weeks after peak bloom	Youngest fully expanded mature leaves.	50-75
Walnut	6 to 8 weeks after bloom	Middle pairs of leaflets from mature shoots.	30-35
ORNAMENTALS AND FLOWERS	Stage of Growth	Plant Part to Sample	Number of Plants or Leaves to sample
Carnations	1) Unpinched plants	4th or 5th leaf pairs from base of plant.	20-30
	2) Pinched plants	5th or 6th leaf pairs from top of primary laterals.	20-30
Chrysanthemum	Prior to or at flowering	Upper leaves on flowering stem	20-30
Ornamental Trees	Current year's growth	Fully developed leaves	30-100
Ornamental Shrubs	Current year's growth	Fully developed leaves.	30-100
Poinsettia	Prior to or at flowering	Most recently mature fully expanded leaves.	15-20
Rose	During flower production	Upper leaves on the flowering stem.	20-30
VEGETABLE CROPS	Stage of Growth	Plant Part to Sample	Number of Plants or Leaves to sample
Asparagus	Midgrowth	Mature fern from 18-36" up	10-20
Beans	1) Seedling stage (less than 12")	All the above ground portion	20-30
	2) Prior to or during initial flowering	Two or three fully developed leaves at the top of the plant	20-30
Head Crops (Cabbage, etc.)	1) Prior to heading	First mature leaves from center of whorl	10-20
	2) Head 1/2 grown	Young wrapper leaf; 2 leaves per plant	10-20
Leaf Crops (Lettuce, Spinach, Turnip Greens, Collards, etc.)	Mid growth	Youngest mature leaf	35-55
Melons (Water, Cucumber, Muskmelon)	Early stages of growth prior to fruit set	Mature leaves near the growing tip of the plant	20-30
Peas	Prior to or during initial flowering.	Leaves from the third node down from the top of the plant	30-60
Peppers	Prior to or at bloom stage.	Most recently meature leaves	20-30
Potato, Irish	Early flowering to tubers 1/2 grown	Upper most mature	20-30
Potato, Sweet	Midgrowth	Most recently mature leaves	20-30
Root Crops (Carrots, Onion, Beets, etc.)	Prior to root or bulb enlargement	Center mature leaves	20-30
Sweet Corn	1) Prior to tasselling	The entire fully mature leaf below the whorl.	20-30
	2) At tasselling	The entire leaf at the ear node	20-30
Tomato (Field)	Prior to or during early bloom stage	Third or fourth leaf from growing tip	20-25
Tomato (Greenhouse)	Prior to or during fruit set	1) Young plants; leaves adjacent to 2nd or 3rd clusters.	20-25
	Prior to or during fruit set	2) Older plants: leaves from 4th to 6th clusters.	20-25