Abstract
Medium particle size plays an important role in plant growth and absorbtion of nutrients. Pore types affect root development and infiltration. In addition, zeolite can increase the efficiency of nutrient use by increasing the availability of phosphate rock and exchange cation without structural changes. The experimental to determine the optimal particle size of zeolite in absorbing phosphate with design a complete random block. Media composition consists of coarse zeolite (ZK) and fine zeolite (ZH) with ratio of 50% ZK + 50% ZH (A1), 25% ZK + 75% ZH (A2) and 75% ZK + 25% ZH (A3). ZK and ZH distribution by mixing it in the tray. The result show that the percentage of survival is A3 which has 78%, A2 and A1 having 33%. Respectively, medium 75% ZK + 25% ZH (A3) was tested for phosphate absorption test, using 5 different levels namely 0 mM phosphate levels (A31), 0.3 mM (A32), 1 mM (A33), 3 mM (A34), and 10 mM (A35). Experimental results that addition of 10 mM phosphate (A35) increased plant length by 51.35%, leaf width 42.50%, wet and dry weight by 156.52% and 195, 54%, weight wet root 53.46% and phosphate content 195.58%. It can be concluded that A3 support the phosphate absorption to sorghum growth.
Published Version
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