Topic: soil fertility calculations

Suppose Mr. Lagbaja has Crasssocephalum crepidoides plantation of 1/2 ha. The field is laid lout at 3m x 4m per plot. Five spoons of the vegetable seeds were planted per plot. Each plot was divided into six rows. If 10g of soil sample from the field was extracted with 100ml ammonium acetate. 5ml of the filtrate was made up to 50ml
Potassium concentration of the final solution was 0.02 ppm. If NPK 15-15-15 fertilizer was applied to supply 40kgN/ha. Calculate the;
1) dilution factor
2) Concentration of K in the soil
3) express result in
a) meq / 100g soil
b) Cmol / kg soil
C) kg / ha
d) mg / kg
e) mg / litre
f) tonnes / ha
4) calculate the amount of NPK required per plot.
5) calculate K

Answer
The K content of the 10g soil was diluted when it was extracted with 100ml ammonium acetate. It was diluted 10 times ( 100 /10). the K content in the 5 ml taken from this diluted solution was rediluted again 10 times when it was made up to 50ml ( 50 / 5 ).. Therefore, the initial K content of the soil has now been diluted 100 times ( 10 x 10 )
Total dilution factor = (100 / 10 ) x ( 50 / 5 )
2) potassium concentration in the soil = potassium concentration of the final solution x the number of times the soil K has been diluted
K conc in soil = k conc in final solution x dilution factor
K conc in soil = 0.02 ppm x 100 = 2ppm
3) meq / 100g
First: make the per million in the ppm to per 100g
read more at www.rahmotagricblog.com/blogindex.php in soilfertiltiy calculations under soil science category in the category section

Please I need an assistance on how to convert cmol/kg to ppm. It is urgent. Thanks

assidiiq252:


Topic: soil fertility calculations

Suppose Mr. Lagbaja has Crasssocephalum crepidoides plantation of 1/2 ha. The field is laid lout at 3m x 4m per plot. Five spoons of the vegetable seeds were planted per plot. Each plot was divided into six rows. If 10g of soil sample from the field was extracted with 100ml ammonium acetate. 5ml of the filtrate was made up to 50ml
Potassium concentration of the final solution was 0.02 ppm. If NPK 15-15-15 fertilizer was applied to supply 40kgN/ha. Calculate the;
1) dilution factor
2) Concentration of K in the soil
3) express result in
a) meq / 100g soil
b) Cmol / kg soil
C) kg / ha
d) mg / kg
e) mg / litre
f) tonnes / ha
4) calculate the amount of NPK required per plot.
5) calculate K

Answer
The K content of the 10g soil was diluted when it was extracted with 100ml ammonium acetate. It was diluted 10 times ( 100 /10). the K content in the 5 ml taken from this diluted solution was rediluted again 10 times when it was made up to 50ml ( 50 / 5 ).. Therefore, the initial K content of the soil has now been diluted 100 times ( 10 x 10 )
Total dilution factor = (100 / 10 ) x ( 50 / 5 )
2) potassium concentration in the soil = potassium concentration of the final solution x the number of times the soil K has been diluted
K conc in soil = k conc in final solution x dilution factor
K conc in soil = 0.02 ppm x 100 = 2ppm
3) meq / 100g
First: make the per million in the ppm to per 100g
read more at www.rahmotagricblog.com/blogindex.php in soilfertiltiy calculations under soil science category in the category section

Thanks bro, greatly appreciated. I have not been able to find answer to the question though. I tried visiting the link but not available or not accessible. However, I have result of a soil test/analysis with me in which the Ca, Mg, K and Na are in cmol/kg which I need to convert to [b]ppm [/b]for easy interpretation

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