Teaching Organic Farming and Gardening

Soil Tests and Amendments

Unit 1.11 | 53
Appendix 2, Part II

Appendix 2 (cont’d): Nutrient Budgeting Work-

sheets – Macronutrients

MACRONUTRIENTS

a
ppm tested

b
ppm optimal range

c conversion factor
ppm to lbs/acre (to 13–14”)

d = b x c
lbs/acre optimal range

e = a x c
lbs/acre total present

f = d - e
pounds/acre of nutrient

required

g
VL Low Med Hi VH

h
% CSR tested

I
% CSR optimal

J
Soil amendment to be used

K
Nutrient content by %

l = f/K
lbs/acre amendment

required

m
tons/acre or lbs/100 sq ft of

amendment needed

n
Price per unit

o
acres or sq ft

P
Total cost /amendment

30  –   40   12 –   15           15 –   20  

x   9.2  x  9.2  x  12  

150 –   250  110    –   138      135    –   185

na na

na na

P1  (P 2 O 5 -P)     P2 (NaHC0 3 -P)            SULFUR   NITROGEN

Available (Olsen    method)             (SO 4 -S)    (NO 3 -N)

total cost of

amendments

(at pH  of  7.0)