Page 181 - Calculating Agriculture Cover 20191124 STUDENT - A

CH 15] Calculating Agriculture 15-9

Example F: Trees are spaced 8m by 8m. (a) How many trees can be planted per hectare
knowing that 1 hectare is 10,000 square meters bounded on its sides by 100
meters? (b) How many trees will be purchased to populate 30 ha? (c) What will be
the investment in trees when each tree will cost $7.98 from the nursery FOB the
farm? Refer to Table 10.7 and Refer to Table 15.1.

Solution:
(a) Square meters / hectare
——————–———–—— = No. of trees per hectare
Row spacing m x Tree spacing

2
10,000 m
———— = No. of trees per ha
8m x 8m
2
10,000 m
———— = No. of trees per ha
2
64 m

156.25 trees/ha = No. of trees per ha = 157 trees per ha

(b) No. of trees / ha x total hectares = Total trees planted
157 Trees / ha x 30 ha =
4710 Trees = Total trees planted

(c) Total trees Planted x Cost / Tree FOB = Total tree investment
4710 Trees x $7.98 / Tree FOB =
$37,585.80 = Total tree investment

Metric Weights
Weight: Gram (g) and Kilogram(kg) are used to measure how heavy an object is, using
instruments. Examples include measuring weight of fruits, cattle, or feedstuffs.

Base
Kilo Hecto Deca Deci Centi Milli
unit

Kilogram Hectogram Decagram Gram Decigram Centigram Milligram
15
(kg) (hg) (dag) (g) (dg) (cg) (mg)
1000 100 10 1 1/10 1/100 1/1000

Figure 15.6 Metric Weights

Example: Baling alfalfa that is field dried has a moisture content of 13%. Presume that baling is
at 1.2 tons per acre. (a) Calculate the tonnes (metric tons) per acre at baling. (b)
Calculate the tonnes Dry Matter at cutting and (c) calculate the forage weight (tonnes)
at harvest with 80% moisture. Note that the Dry Matter weight does not change but the
percent DM does change.

Solution:
(a) Metric weight (tonnes) = English weight (tons) x 0.91
= 1.2 tons x 0.91
Metric weight (tonnes) = 1.09 tonnes

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