Abstract
Our previous studies showed that the extreme high yield tropical rice (Padi Panjang) produced 3-8 t ha-1 without fertilizers. We also found that the rice yield did not correlate with some soil properties. We thought that it may be due to ability of root in affecting soil properties in the root zone. Therefore, we studied the extent of rice root in affecting the chemical properties of soil solution surrounding the root zone. A homemade rhizobox (14x10x12 cm) was used in this experiment. The rhizobox was vertically segmented 2 cm interval using nylon cloth that could be penetrated neither root nor mycorrhiza, but, soil solution was freely passing the cloth. Three soils of different origins (Kuin, Bunipah and Guntung Papuyu) were used. The segment in the center was sown with 20 seeds of either Padi Panjang or IR64 rice varieties. After emerging, 10 seedlings were maintained for 5 weeks. At 4 weeks after sowing, some chemical properties of the soil solution were determined. These were ammonium (NH4+), nitrate (NO3-), phosphorus (P) and iron (Fe2+) concentrations and pH, electric conductivity (EC) and oxidation reduction potential (ORP). In general, the plant root changed solution chemical properties both in- and outside the soil rhizosphere. The patterns of changes were affected by the properties of soil origins. The release of exudates and change in ORP may have been responsible for the changes soil solution chemical properties.Keywords: Ammonium, electrical conductivity, iron, nitrate, oxidation reduction potential, pH, phosphorus [How to Cite: Purnomo E, D Choiron, R Yulia, H Halim, Krisdianto, A Hairani and M Osaki. 2012. Adding Organic Matter Enhanced the Effectiveness of Silicate Rock Fertilizer for Food Crops Grown on Nutritionally Root-induced Changes in the Rhizosphere of Extreme High Yield Tropical Rice: 2. Soil Solution Chemical Properties. J Trop Soils, 17 (3): 67-74. doi: 10.5400/jts.2012.17.3.189][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.189]
Highlights
In rice growing areas of South KalimantanProvince, the local cultivars are preferred by local farmers
This work investigated the effect of the rice roots in changing the chemical properties of soil solution in the rhizosphere and bulk soil
The soil solution samples were analysed for their concentrations in ammonium (NH4+-N), nitrate (NO 3 - -N), and phosphorus (P), pH, electric conductivity (EC), and oxidation reduction potential (ORP)
Summary
The local cultivars are preferred by local farmers. Most of the areas are swamplands in which water fluctuation is unpredictable. Seedlings of modern rice varieties are too short to cope with a high water fluctuation. They are tall seedlings (c.a. 1 m), they can survive in the high water level fluctuation and they are more tolerance to severe soil condition. We thought that it may be due to ability of root in affecting soil properties in- and out-side of the rhizosphere (Purnomo et al.2010). The plant roots have ability to influence the physical, chemical and biological properties of rhizosphere soil. E Purnomo et al.: Rhizosphere of Extreme High Yield Tropical Rice nutrient concentration (Wang et al 2005; Purnomo et al 2010). This work investigated the effect of the rice roots in changing the chemical properties of soil solution in the rhizosphere and bulk soil
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