CHAPTER 4 EXPERIMENTAL RESULTS AND DISCUSSION 4.1 General Information This chapter discusses the result of the experiment on soil properties in Orthosiphon Stamineus soil, INSAT as described in chapter three. The experiments aimed to study the impact of compaction on soil properties at different depths for the cultivation of Orthosiphon Stamineus in order to determine the suitable soil classes and propose the best depth to plow the area in order to have a yield high with a cost-effective practice to manage. the area. The experiment is conducted according to the correct procedure as mentioned in the methodology of the study described in chapter three. The result and their comparisons are described through the table and figures as follows. Finally, the experimental results are summarized at the end of the chapter.4.2 Sieve Analysis Method The following figure shows that the 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: Grain size analysis of the soil for sample AFigure 4.2: Grain size analysis of the soil for sample BFigure 4.3: Grain size analysis of the soil for sample CThe analysis of the sieve is used to determine the grain size distribution using sieves no. 8, 18, 35, 50, 100, 200 and 400. Each 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 follows, 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 sample B. Subsequently, 95.42% , 79.44%, 67.31%, 58.29%, 39.96%, 17.36% and 5.11% for sample C. The percentage passing This can then be used to plot the semi- logarithmic of the percentage of passage with respect to the opening size of the sieve. The figure......in the middle of the paper......res and water are available at the bottom of the soil which can provide enough water for growing "Misai Kucing" as it needs a high volume of water . To propose a suitable method the depth of the plow for “Misai Kucing” depending on the root of the plant and the type of soil can be obtained using the available water equation: AW = Drz x AWH= 80 cm x (167 mm /m) = 0.08mx (167mm/m)=13.36mmSo the most efficient plowing depth for growing “Misai Kucing” at the highest level is 0cm - 15cm due to the fibrous properties of the “Misai Kucing” root Misai Kucing” and deep plowing is not necessary. The fibrous root extends 80 cm into the Available Water Holding (AWH) soil of silty clay soil taken from Table 3.2 which limits water uptake only to a depth of 13.36 mm. Indirectly this can reduce overhead costs and bills which can generate high income due to less energy needed in plowing.