Substrate Culture from Leaf Sheath of Banana and Sawdust
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Abstract
The purpose of this study was to find out the balanced proportion and characteristics of substrate culture derived from mixed leaf sheath of banana and sawdust. Starch paste was used as cementing agent. The proportions of leaf sheath of banana and sawdust of 4 ratios were as follows: 1) 100:0, 2) 75:25, 3) 50:50, and 4) 75:25 by weight (4 replications). The results of the physical study found that all ratios were able to form substrate culture. The physical appearances of substrate culture were well adherent. The average dry weight was in the range of 121.10-130.06 gram. The bulk density was in the range of 0.27 - 0.29 g/cm3. The average water absorption was high in all proportions at the average of 217.40-299.98%. The average decomposition was 11.04-16.75%. The pH of most substrate culture was moderately acidic (pH 4.78-6.38) and the Electrical Conductivity (EC) was in the range of 1.70-7.23 dS/m. In addition, the macronutrients (nitrogen (N), phosphorus (P) and potassium (K)) were found in all proportions with more potassium (K) content compared to other nutrients. Considering the quality of each proportion, the third proportion was the most appropriate for developing as substrate culture. This proportion is easily obtainable, exhibits good water retention, possesses safe pH for plants, and is convenient for handling and transportation. Specifically, it has an average bulk density of 0.28 g/cm3, water absorption of 252.98%, dissolution in water of 14.56%, electrical conductivity of 2.67 dS/m, pH of 5.89, and nutrient content of 0.09%, 0.05%, and 1.45% for N, P, and K, respectively.
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