College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083, China.
Fujian Provincial Investigation, Design & Research Institute of Water Conservancy & Hydropower, Fuzhou, 350001, China.
Sci Rep. 2019 Mar 26;9(1):5226. doi: 10.1038/s41598-019-41617-z.
Soil oxygen shortages in root areas have negative effects on crop growth and decrease crops yield and quality, and soil hypoxia conditions will be aggravated by application of subsurface drip irrigation (SDI). A two-year field experiment was conducted to evaluate the response of maize to micro/nanobubbles oxygation (MNBO) at three dissolved oxygen (DO) concentrations (10, 20 and 30 mg/L) and seven MNBO periods (vegetative stage, reproductive stage, filling and ripening stage, combination of two stages and the whole growth stage) in addition to a control treatment (CK, no oxygation during the growth period). Our results revealed that the MNBO treatments increased maize root dry weight, root length density and root surface area in 0-20 cm soil. The highest yield was obtained in OA (MNBO at 20 mg/L DO during the growth period), with an increase of 11.66% relative to CK. Crude ash, starch and vitamin C were improved by application of MNBO at 20 mg/L DO. However, excessive oxygen adversely affected maize growth, decreasing the maize yield in 2013 relative to CK. The results suggest that application of MNBO at 20 mg/L DO during the growth period of spring maize was appropriate.
根系土壤缺氧会对作物生长产生负面影响，降低作物的产量和品质，而地下滴灌（SDI）的应用会加剧土壤缺氧状况。本研究通过两年田间试验，评估了在三个溶解氧（DO）浓度（10、20 和 30 mg/L）和七个微纳米气泡增氧（MNBO）时期（营养生长阶段、生殖生长阶段、灌浆期和成熟期、两个阶段组合和整个生长阶段）下，外加对照处理（CK，生长期间不增氧）对玉米的影响。结果表明，MNBO 处理增加了 0-20 cm 土壤中玉米根系干重、根长密度和根表面积。OA 处理（整个生长期间 DO 为 20 mg/L 时进行 MNBO）的产量最高，与 CK 相比，产量增加了 11.66%。MNBO 处理在 20 mg/L DO 下提高了粗灰分、淀粉和维生素 C 的含量。然而，过量的氧气会对玉米生长产生不利影响，导致 2013 年玉米产量低于 CK。结果表明，在春玉米生长期间，20 mg/L DO 的 MNBO 处理是适宜的。
