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Study on the use of sediment from rubber factory wastewater treatment ponds for growing kale (Chinese kale) The objectives were to study the quality of sediment from a rubber factory wastewater treatment pond affecting the growth of kale and to compare the growth of kale grown in different planting media. The experimental design was divided into 6 experimental sets with 3 replications per experiment.Experimental set 1) Soil Experimental set 2) Sludge from a rubber factory wastewater treatment pond Experimental set 3) Sludge from a rubber factory wastewater treatment pond mixed with Azolla in a ratio of 50:1.Experimental set 4) Sludge from a rubber factory wastewater treatment pond mixed with Azolla in a ratio of 50:1.5 Experimental set 5) Sludge from a rubber factory wastewater treatment pond mixed with Azolla in a ratio of 50:2 Experimental set 6) Sludge from a rubber factory wastewater treatment pond mixed with Azolla in a ratio of 50:2.5Analyze soil quality including pH, soil texture, soil color, moisture, porosity, and soil nutrients. Organic matter content and growth rate of kale The study found that the color of the planting material was mostly grey. Except for the planting material in the ratio 50:1 which is dark gray. All experimental sets were sandy loam.The highest moisture content was 90% in the third experimental set. The highest porosity was 20.13% in the fourth experimental set. Soil nutrient levels increased sequentially in the fourth, fifth and sixth experimental sets. The highest organic matter content was in the fourth experimental set. The growth of kale in rubber factory sludge improved significantly.wastewater treatment ponds compared to planting soil. However, when analyzing the yield of Chinese kale grown in planting materials mixed with Azolla, the growth rate was lower in the fifth and sixth experimental sets. The sixth experimental set gave the best planting results. This shows that sludge from rubber factory wastewater treatment ponds can be applied as a planting material to promote growth and increase the yield of vegetables. The study found that the sludge from wastewater treatment ponds of rubber factories can be developed into a planting material for growing crops. When mixed with azolla in ratios of 50:1, 50:1.5, 50:2, and 50:2.5, the planting material showed high moisture content, high porosity, and a moisture ratio close to each other. The pH was neutral, the minerals were suitable, nitrogen levels increased accordingly, and the organic matter content was at a moderate level. Therefore, this mix is suitable for use as a planting medium for kale. When the kale was grown, the results showed that the best growth occurred in the experiment with a 50:2.5 ratio of sludge to azolla (Experiment 6), in terms of leaf number, height, and weight. The second-best growth occurred in Experiment 5, with a 50:2 ratio of sludge to azolla. The experiment with the least positive effect on kale growth was Experiment 1, which used regular soil. Keywords: Sludge from rubber factory wastewater treatment ponds, Azolla, Planting material ,Kale