رویان

بزرگترین مجله کشاورزی اینترنتی

رویان

بزرگترین مجله کشاورزی اینترنتی

SOLUBILITY OF FERTILIZER MATERIALS حل شوندگی مواد کودها

There are several instances when it may become necessary to apply fertilizer materials in solution.  Solubility of materials is an important factor in preparing foliar sprays or starter fertilizer solutions.  Some chemicals have low solubility's and hot water may be needed to get them dissolved.

Solubility in Cold Water

Material

(lb/100 gal)

Primary Nutrients

Ammonium nitrate

984

Ammonium sulfate

592

Calcium cyanamide

Decomposes

Calcium nitrate

851

Diammonium phosphate

358

Monoammonium phosphate

192

Potassium nitrate

108

Sodium nitrate

608

Superphosphate, ordinary

17

Superphosphate, triple

33

Urea

651

Secondary and Micronutrients

Ammonium molybdate

Decomposes

Borax

8

Calcium chloride

500

Copper oxide

Insoluble

Ferrous sulfate

242

Foliarel

123 @ 68oF

Magnesium sulfate

592

Manganese sulfate

876

Sodium chloride

300

Sodium molybdate

467

Solubor

79 @ 68oF

Zinc sulfate

625

Source: O.A. Lorenz & D.N. Maynard. 1980. Knott's Handbook for Vegetable Growers.  (2nd edition.) John Wiley & Sons, Inc., New York.

 

Calculating Parts Per Million

From the Texas Greenhouse Management Handbook

Greenhouse growers frequently express the concentration of fertilizers, in terms of parts per million (ppm).  This unit of measure is relatively unique to the greenhouse industry and often there is some confusion on how ppm is calculated.  The following is a "simplified" formula suitable for most green-house applications.

I. To calculate the ppm contained in 1 ounce of material first solve for B:

A x 75 = B

A = the % active ingredient (AI) in the fertilizer

B = ppm contained in 1 ounce of the material in 100 gallons of water

Example:  Calcium nitrate contains 15% N (0.15 x 75 = 11.25).  If 1 ounce of calcium nitrate is dissolved in 100 gallons of water the solution will contain approximately 11.25 ppm N.

II. To calculate the number of ounces of material required to make up a desired ppm concentration solve for C:

C = Desired ppm conc. / B

B = ppm contained in 1 ounce of the material in 100 gallons of water (from above).

C = number of ounces of material to add to 100 gallons of water to achieve the desired concentration.

Example:  To make up a 250 ppm solution of calcium nitrate first multiply the AI x 75 (.15 x 75 = 11.25).  Next divide the desired concentration by 11.25 (250/11.25 = 22).  To make up a 250 ppm solution of calcium nitrate you would add 22 ounces to 100 gallons of water.

Practical Examples

I.  Make up a nutrient solution of 300 ppm N.   Half of the N to be supplied by ammonium nitrate and 1/2 calcium nitrate dilute 5 and 13 ounces respectively in 100 gallons of water.

II.  Make up a 200 ppm solution of ammonium nitrate for use with a 1:100 proportioner.

.33 x 75 = 29.75

200/29.75 = 7 ounces of ammonium

7 x 100 = 700 to adjust for proportioner

To make up a 200 ppm solution of ammonium nitrate for use with a 1:100 proportion dilute 700 ounces of material in 100 gallons of water.

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