Example1

Consider our 15' diameter tree that had an area of 176.71 square feet, but now let's say it's in medium soil and with a 60% wetting requirement for its area.

The Factors

Area of Plant = 176.71 sq. ft.

% to be wetted (as a decimal = .60

Minimum wetted area medium soil= 21 sq. ft. from table

The Formula

176.71 x .60 = # Of emitters

21

reduced to:

106 = 5 emitters

21

Example 2

The shrub area that has 3' x 3' spacing 60% wetted area desired Coarse sandy soil

The Factors

Plant area = 9 sq. ft.

60% wetted area desired = .60

Minimum sandy soil wetted pattern = 5 sq. ft. from the table

The Formula

9 x .6 = 1.08 or one emitter

5

If our answer had been significantly larger than the whole number we would have rounded up to the next number (i.e. 1.4 would be 2 emitters).

Try the two practical exercises on the following pages to help familiarize yourself with the emitters per plant formula.

Practical Exercise

Number of Emitters per Plant

Example 1

Tree roses singly spaced with 2.5 foot canopy diameters in medium (loam) grade soil. 100% of root area to be wetted.

The Factors

Plant area = _____________sq. ft.

% to be wetted (as a decimal)= __________

Minimum area wetted medium soil=___________sq. ft. from table

The Formula

X = emitters

Rounding up to the next whole number of emitters, how many will you use per plant?

____________emitter (s).

Example 2

An orange tree with a 25 foot diameter across its drip line in clay-like fine soil with 60% wetting required for plant area.

The Factors

Plant area=_________sq. ft.

% to be wetted (decimal)=__________

Minimum area wetted/emitter fine soil =_________________ sq. ft.from table

The Formula

X = emitters

Rounding up to the next whole number of emitters, how many will you use per plant?

____________emitter (s).

Answers to Excercises

Example 1

The Factors

Plant area = 4.9

of area to be wetted (decimal) = 1.0

Minimum area wetted medium soil = 21 sq. ft. from table

The Formula

4.9 x 1.0 = .23 emitters

21

Rounding up to the next whole number of emitters, how many will you use per plant? one

emitter (s).

Example 2

The Factors

Plant Area = 490.875 sq. ft.

% to be wetted (decimal) =.60

Minimum area wetted/emitter for fine soil =65 sq. ft. from table

The Formula

490.87 x .6 = 4.5 emitters

65

Rounding up to the next whole number of emitters, how many would you specify per tree? 5 emitters.

RAINO IRRIGATION COMPANY

Parolical,Kottayam-686562,Kerala, ,

Phone:-0481-2792365