Sieve Analysis Essay

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CHAPTER 4

EXPERIMENTAL RESULT AND DISCUSSION

4.1 General

This chapter discusses the result of experiment of soil properties at the Orthosiphon Stamineus plot, INSAT as describe in chapter three. The experimental were aimed to study the impact of compaction on soil properties at different depth for Orthosiphon Stamineus cultivation in order to determine the suitable soil classes, and propose best depth to plough the area to in order to have high yield with cost effective practice to manage the area.

The experiment is taken according to proper step as mentioned in methodology of the study described in chapter three. The result and their comparisons are described through table and figures as following. Finally the experimental results are summarized at the end of the chapter.

4.2 Sieve analysis method

The figure below shows graph was plotted based on the sieve analysis result. The graph shows the curve for the soil sample A, B and C.

Figure 4.1: Soil grain size analysis for sample A

Figure 4.2: Soil grain size analysis for sample B

Figure 4.3: Soil grain size analysis for sample C

The sieve analysis use to determine the grain size distribution by using sieves no 8, 18, 35, 50, 100, 200, and 400. Every sieve is different in both diameter and weight. For sample A, after sieving according to sieve no 8, 18, 35, 50,100, 200 and 400 are as following, 73.53%, 62.38%, 53.93%, 44.42%, 24.78 %, 8.69% and 1.89%, for sample B, 84.53%, 70.97 %, 61.01 %, 51.41 %, 32.25 %, 13.01 %, and 3.6 % for the sample B. Next, 95.42 %, 79.44 %, 67.31 %, 58.29 %, 39.96 %, 17.36 %, and 5.11% for sample C. The percentage passing is then can be used to plot the semi log graph of Percentage Passing vs. Sieve Opening Size. The figu...

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...res and water are available in lower part of soil which can provide enough water for “Misai Kucing” cultivation since it needs high volume of water.

To propose a suitable plough depth for “Misai Kucing” depending on root of the plant and type of soil can be made using available water equation:

AW = Drz x AWH
= 80cm x (167mm/m)
= 0.08m x (167mm/m)
=13.36mm

So the most efficient ploughing depth for “Misai Kucing” cultivation at top level is 0 cm - 15 cm caused by the fibrous properties of root of “Misai Kucing” and there is no need for deep ploughing. The fibrous root extends 80 cm into soil with available water holding (AWH) of silty loam soil taken from Table 3.2 which limit the water uptake into depth of 13.36 mm only. Indirectly this can cut overhead cost and bills which can generate high revenue contributed by the lesser need of energy in ploughing.

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