(IPPM) in Vegetables - Vegetableipmasia.org

Resource Manual on IPPM in Rice
World Education Philippines, Inc.
d. Calculation of Mixed Fertilizers
Example 3
Find out the number of kilograms of the separate fertilizer materials needed for
the preparation of one metric ton (1,00kg) of mixed fertilizer of 5-8-12 grade
using ammonium sulfate (20% N), calcium superphosphate (16% P 2 O 5 ) and
muriate of potash (60% K 2 0).
Work out the quantities of the individual fertilizers required for 100 kg of 5-8-12
fertilizer mixture, i.e., to contain 5% N, 8% P 2 O 5 and 12% K 2 0. Then multiply
these figures by 10 obtain the total requirement of fertilizers for 1,000 kg of the
mixture.
5 x 100
For N =
= 25 kg ammonium sulfate
20
8 x 100
P 2 O 5 = = 50 kg calcium superphosphate
16
12 x 100
K 2 0 = = 20 kg muriate of potash
60
95 kg of straight fertilizers
+5 kg of filler
100 kg of mixed fertilizer
For preparing 1,000 kg of a fertilizer mixture of the 5-8-12 grade, 250 kg of
ammonium sulfate, 500 kg of calcium superphosphate, 200 kg of muriate of
potash and 50 kg of the filler are needed.
Example 4
Find out the quantities of the individual fertilizers and filler needed to make up a
metric ton of 10-10-15 fertilizer mixture using urea (45% N), and ammonium
chloride (26%N) in equal quantities, calcined phosphate (30% P 2 O 5 ) and sulfate of
pitash (50% K 2 0).
Work out the quantities of different fertilizers required for 100 kg of 10-10-15
fertilizer mixture and multiply these figures by 10 to obtain the total requirement
of different fertilizers, to make up one metric ton of the mixed fertilizer.
Since N is to be supplied in equal parts through urea and ammonium chloride, 10
kg of N in every 100 kg of mixture should contain 5 kg of N from each source.
For N
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