If the plant is less than 12 inches tall, collect all of the above-ground portion. Alfalfa Collect the top 6 inches or upper third of the plant at early bloom. Soybeans Collect recently mature trifoliate leaves from the top of 20-30 plants before or during bloom. Sorghum Collect the second learf from the top of 20-30 plants before or at heading. Apples, Pears, Almonds, Apricots, Cherries, Prunes, Plums Collect the leaves from the current season's nonfruiting, nonexpanding spurs at midseason.
Grapes Collect the petioles or leaves adjacent to basal clusters at bloom.
Small grains Collect the four uleaf blades from the top of 25-40 plants. Sample should equal 2 cups. Cotton Collect recent from the main stem on 40 to 50 plants selcted at random at full bloom. NMSU and the U.S. Department of Agriculture cooperating.