Nutrient Management - Growing Organic Orchard Fruits - page 412

500 pounds of blood meal per acre ÷ 605 trees per acre = 0.82
pounds of blood meal per tree

For small orchards , you may need small amounts of fertilizer and it may be
more convenient to convert pounds to ounces (dry) of fertilizer.

0.82 pounds of blood meal × 16 ounces per pound = 13.2 ounces
of blood meal per tree

Amount of fertilizer for metric areas. Exactly the same procedures apply
when calculating kilograms of fertilizer per hectare or 100 square meters.
Soil and tissue test recommendations in Canada are likely to be given
in kilograms of nutrient per hectare. If you are converting between U.S. and
metric units, remember that kg/ha = 1.12 × lbs/acre. Say that your analyses
show potassium and magnesium to be deficient and you plan to correct the
problem using sul-po-mag. From table 8.4 ➔ , you see that sul-po-mag con-
tains about 22 percent K O and 11 percent magnesium. The laboratory's re-

2
commendation is to apply 60 kg of K O and 30 kg of Mg per hectare.

2

60 kg of K O ÷ 0.22 = 273 kg of sul-po-mag per hectare

2

30 kg Mg ÷ 0.11 = 273 kg of sul-po-mag per hectare

One hectare = 10,000 square meters. To calculate the amount of sul-po-mag
needed per 100 square meters:

273 kg per 10,000 square meters ÷ 100 = 2.73 kg of sul-po-mag
per 100 square meters

If your tree density is 1,400 trees per hectare:

273 kg of sul-po-mag per hectare ÷ 1,400 trees = 0.195 kg = 195
g of sul-po-mag per tree