Page 179 - Calculating Agriculture Cover 20191124 STUDENT - A

CH 15] Calculating Agriculture 15-7

Solution:

(a) Row spacing inches x 36 in/yd x metric factor = metric length
36 inches x 1 yd/36 inches x 0.91 yds/meter = meters
36 inches x 1 yd/36 inches x 0.91 yds/meter = meters
1 yd x 0.91 yds/meter) = 0.91 meters

(b) Row length feet x metric factor = metric length
419.35 ft x 0.31 meters/ft = meters
130 m = meters

Example B: Trees are spaced 20’ by 20’. (a) What is the metric measurement for this tree
spacing? Refer to Table 10.7 and Refer to Table 15.1.
(a) 6.2 x 6.2 m _____ tree spacing meters

Solution:
(a) Tree spacing x metric factor = metric length
20 ft x 0.31 meters/ft = meters
6.2 m = meters

LAND MEASUREMENT (AREA)
The standard land measurement (area) is acres in the English system for measurement. There are
2
43,560 square feet ( ft ) in one acre. The acre is bounded by (square root of 43,560 =) 208.7 linear
feet.
The standard metric land measurement is hectare. There are (100m x 100m =) 10,000 square
2
meters ( m ) in the hectare which is bounded by 100 meters.
To convert the English land measurement, acres, to the metric measurement multiply the number
of acres by 0.4. To convert hectare’s to acres the process is division; divide the number of hectares by
0.40. Refer to Table 15.1.

Base
Kilo Hecto Deca Deci Centi Milli
unit

Kiloare Hectare Decare ares Deciare Centiare Milliare
15
(ka) (ha) (de) (ar) (da) (ca) (ma)
1000 100 10 1 1/10 1/100 1/1000

Figure 15.5 Metric Land Areas

Example A: Tom Jones farms sorghum on 160 acres of land. How many hectares is he farming?
Refer to Table 15.1.
Solution: hectares = acres x metric factor
hectares = 160 x 0.4
hectares = 64.0 ha

Example B: The Smith family farms 160 ha. How many acres are they farming? Refer to Table
15.1.
Solution: acres = hectares ÷ metric factor
acres = 160 ha ÷ 0.4
acres = 400 acres

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