Characteristics of Maize Roots under Subsurface Drip Irrigation through Various Oxygen Treatment

In Korea, irrigation technology using subsurface drip (SDI) is new in agriculture system. Many limitations of SDI are not well known. can damage crops from overwatering. To address this weakness, it important to improve and test the applicability with air injection (oxygation). Therefore we investigated soil oxygen (O2) carbon dioxide (CO2), root characteristics yield maize two conditions moisture regime: field capacity (FC) × 100% 120%. Maize was planted, then injected by compressor venturi. field, controlled a controller connected sensors. Soil sensors were measured at 20 cm below surface. O2 CO2 10 30 surface before after oxygation. Root activity tip roots. volume dry weight measured. Post-harvest, number ears surveyed as well. As result, values increased 59% treatment 34% venture treatment. However, CO2values did depend on all treatments, oxygated roots greater than that control, 152%. also those control. No significant effect found maize. The average ear FC 1,292 kg 10a-1 oxygation 1,278 addition, no observed ears. 120% 1,229 960 28% grown control showed tendency decrease content increased. At moisture, reduced 25% compared moisture. These results reflected process had great growth even humid conditions, which expected have positive plants planted above-ground.Root activity, corn result oxygation; treatments (field 100%, 120%), Oxygation (compressor, venturi), Control (no injected). regime (µg g-1 h-1) (g) (cm3) Compressor 50.1 ± 1.69 b† 49.5 19.25 269 83.8 Venturi 67.8 3.25 44.6 10.17 224 34.9 32.2 2.08 c 12.5 5.55 b 59 43.8 50.8 1.07 42.4 0.74 ab 225 5.0 39.2 1.54 73.7 25.75 326 56.6 35.8 1.52 14.6 9.81 60 48.2 †a, represent difference level 95%.