植物营养与肥料学报2016，Vol.22Issue(6)：1620-1627,8.
缺氮胁迫下含 Na+叶面肥对花生生长的抑制及补氮后的恢复效应
Inhibition of Na+-containing foliar fertilizer on peanut growth under N deficiency stress and recovery effect by supplemental N spraying
摘要
Abstract
[Objectives]Sodium (Na+) is often contained as counterion in foliar fertilizers, so its effect on crop growth is least considered during fertilization. Na+ plays both promotion and inhibition roles on crop growth, depending on the plant nutrition and physiology status. The inhibition role of Na+ was studied on peanut exposure to Na+ stress, and the recovery effect of supplemental spraying N to the inhibition was also investigated.[Methods]A pot experiment was conducted inside the growth chamber located in Shandong Peanut Research Institute. Three levels of Na+ were designed in the foliar fertilizer: Na+ 0, 2.0 and 10.0 mg/pot, and recorded as T0, T1 and T2 in turn. The peanut photosynthesis, dry matter accumulation, root morphology, nutrient absorption were investigated in both N deficit stresses (T0, T1, T2) and later urea supplement (T0-N, T1-N, T2-N). The effect of Na absorption on the N, P and K absorption was analyzed.[Results]1) Without N supplement, the net photosynthetic rates were significantly decreased from 11.4 CO2 μM/(m2·s) to 6.7–7.5 CO2 μM/(m2·s) in Na containing treatments, the dry weights of shoot and root were in order of T0 (6.4 and 2.4 g/pot) > T1 (5.7 and 1.9 g/pot) > T2 (5.3 and 1.5 g/pot). Total root length, surface area, and volume in T1 and T2 treatments were decreased by 7.8%–10.5% and 27.5%–31.8% compared with T0. 2) With later supplement of N, Na+ inhibition in photosynthesis was recovered quickly. The shoot dry weights in T1-N and T2-N treatments were increased by 20.3%–25.8% compared with T0-N. The inhibition of Na+ became promotion of N, P, K absorption. The shoot N, P, K absorptions in T1-N and T2-N treatments were respectively increased by 9.2%–19.2%, 20.0%–42.3%, 21.4%–24.0% compared with T0-N. The total dry weight of peanut and N, K absorptions were positively correlated with Na+ (P < 0.05).[Conclusions]Under N deficit, Na+ shows inhibition effect on the growth and nutrient absorption of peanut and the effect will become exaggerated with the increased Na+ contents in fertilizers.This inhibition will be remarkably correlated by later supplement of N, and the inhibition role will change to promotion role of Na+. Therefore, application of Na+ containing fertilizer, especially those with high Na+ concentration, should consider the N supply in order to relieve the possibly harmful effect of Na+.关键词
钠胁迫/生长状况/补充供氮/恢复效应Key words
sodium stress/growth inhibition/N supplemental supply/recovery effect分类
农业科技引用本文复制引用
沈浦,郑亚萍,冯昊,罗盛,于天一,郑永美,吴正锋,陈殿绪,孙学武,王才斌..缺氮胁迫下含 Na+叶面肥对花生生长的抑制及补氮后的恢复效应[J].植物营养与肥料学报,2016,22(6):1620-1627,8.基金项目
山东省农业科学院科技创新重点项目（2014CXZ06-2，2014CXZ11-2）；国家自然科学基金项目（41501330，31571617）；山东省农业科学院青年科研基金项目（2015YQN05）；山东省农业重大应用技术创新课题资助。 （）
