2.1.4 bending strength test
2.1.4.1 The test rod broken tester bending strength. By positioning rods based test 1 image and increase the pressure consistently rate not less than 200 newton per minute, but no more than 800 newton per minute. Until the bar test broken record readings. The readings must be no less than 5 Newtons per square millimeter (N / mm²) according to the standard of product of cement plaster. Industrial standard of industry or industrial 2488 - 2553.
2.1.4.2 Calculation of bending strength, according to the equation, 3
bending strength(N / mm²) =3PL/2bd² …………(3)
When P = pressure makes rods testing broken (Newton).
L = the distance of point supported test piece (mm).
B = width of bars test (mm).
D = thickness of the bars test (mm).
2.2 Preparation flowerpot
2.2.1 mix of flowerpot that the ratio of sawdust: plaster proper.
2.2.2 the ingredients in any 2.2.1 to add water and mixed homogeneously by composite material and water was 100: 50.
2.2.3 then bring mold forming according to the size 6x6 inches.(diameter x height).
2.2.4 the flowerpot to aerate in the shade for a period of 7 days.
2.2.5 the trees planted in pots prepared according to requirements.
3. Data analysis.
3.1 variables analyzed, including moisture content, density and bending strength in each ratio the arithmetic mean and standard deviation.
3.2 The value of the test data in the form of a bar chart by X axis ratio of sawdust: plaster and axis Y is moisture content. The density and the bending strength (N / mm²).