Question

The proportion of compounds of nitrogen phosphprous and potassium is 18: 18: 10. remaning part is of other substance find the weight of each of the above compunds in 20 kg of fertilizer ?​

Answer 1

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To calculate the pounds of nitrogen in a 50-lb bag of 10-10-10 fertilizer, multiply 50 by 0.10. Do the same for calculating the amounts of phosphate and potash. A 50-lb bag of 10-10-10 contains a total of 15 lbs of nutrients: 5 lbs nitrogen, 5 lbs phosphate and 5 lbs potash. The remaining weight is filler, usually sand or granular limestone.

Another example:

50-lb. bag of 8-0-24 fertilizer

1. To calculate the pounds of nitrogen: Multiply 50 by .08, which equals 4.
2. To calculate the pounds of phosphate: There is no phosphate in this bag of fertilizer.
3. To calculate the pounds of potash: Multiply 50 by .24, which equals 12.

A 50 pound bag of 8-0-24 fertilizer contains a total of 16 lbs of nutrients: 4 lbs nitrogen, 0 lbs phosphate, and 12 lbs potash. This would leave us with 34 lbs of filler.

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