The zeolite XRD analysis result showed that it is 100% Clinoptilolite ─ Ca with the chemical formula Si29.04Al6.96O96.40Na1.92Ca1.57Ba0.32K0.56Mg0.72. Particle size distribution and Zeta potential for minerals have been carried out using Zeta sizer nano series (Nano ZS), Malvern, UK - Size range (nm):0.6:6000 nm and Zeta potential range (mV): (-200:200 mV) and analysis results are presented in Table 3. They The minerals were applied before planting in two separate rates ≈ 595.24 and 1190.48 5 kg/ha. accompanied with Aa constant rate of K-humate (4.8 kg/ha, 11.2% K2O) that is 2 kg/fed (≈ 4.76 kg/ha) was sprayed as an aqueous solution on soil 30 days after planting. A treatment including includes the higher mineral rate (500 kg/fed ≈ 1190.48 5 kg/ha) without K-humate was used for comparison.
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The solubility and availability of Si and Fe released from minerals Release of Si and Fe from different studied minerals by the K-humate ligand was tested in distilled water on the laboratory scale. Three separate flasks each of which contains a 0.5 g of K-humate salt dissolved in 50 mL distilled H2O (1% K-humate solution). Five grams of each mineral was were then added to this solution giving a partial suspension of pH 9.8 without modification. separate flasks each of which contains 1% K-humate solution in dist. H2O. The mixture was shaken at room temperature, left for overnight, and then filtered and the concentration of soluble Si and Fe was measured in the filtrate by Inductively Coupled Plasma Spectrometry (ICP-Ultima 2 JY Plasma).ICP-Atomic Absorption Spectrophotometer (ICP-AAS). Total soluble Si and Fe released from both minerals and in humate solution in (mg) for the studied mineral rates mg was calculated and presented in (Table
The solubility and availability of Si and Fe released from minerals Release of Si and Fe from different studied minerals by the K-humate ligand was tested in distilled water on the laboratory scale. Three separate flasks each of which contains a 0.5 g of K-humate salt dissolved in 50 mL distilled H2O (1% K-humate solution). Five grams of each mineral was were then added to this solution giving a partial suspension of pH 9.8 without modification. separate flasks each of which contains 1% K-humate solution in dist. H2O. The mixture was shaken at room temperature, left for overnight, and then filtered and the concentration of soluble Si and Fe was measured in the filtrate by Inductively Coupled Plasma Spectrometry (ICP-Ultima 2 JY Plasma).ICP-Atomic Absorption Spectrophotometer (ICP-AAS). Total soluble Si and Fe released from both minerals and in humate solution in (mg) for the studied mineral rates mg was calculated and presented in (Table