BACKGROUND:For global water shortage concerns and high cost of mineral nutrients it is necessary to decrease the amount of nutrient solutions in greenhouse production systems. Deficit fertigation may negatively affect the crop productivity and phytohormones can mitigate the adverse effects of stresses. OBJECTIVE:We studied the effects of deficit fertigation in combination with salicylic acid (SA) and putrescine (PUT) on strawberry fruit yield and quality. METHODS:Strawberry plants were fertilized with a complete nutrient solution of 220 (control), 180 (mild deficit fertigation) and/or 140 mL/dD (severe deficit fertigation), and treated with PUT (at 0 and 2 mM) and/or SA (at 0 and 2 mM) and the combinations of these treatments during growth stages. Fruit growth, quality parameters, yield and phytochemical compounds were evaluated at harvest. RESULTS:Mild deficit fertigation (MDF) (140 mL/d) significantly enhanced the yield and quality of the fruit, and both PUT and SA, enhanced the positive effects of MDF on crop productivity. SA and PUT decreased the negative effects of DF on crop yield and fruit growth. CONCLUSIONS:The results of this study indicate that it is possible to substantially enhance the quality and productivity of strawberries with a MDF regime, and PUT and SA treatments.

中文翻译：

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水杨酸和腐胺处理减轻亏缺施肥对草莓产量，品质和植物化学成分的不利影响

背景：出于对全球水资源短缺的关注和矿物质养分的高成本，有必要减少温室生产系统中养分溶液的量。亏缺施肥可能会对作物生产力产生不利影响，而植物激素可以减轻胁迫的不利影响。目的：我们研究了水肥不足联合水杨酸（SA）和腐胺（PUT）对草莓果实产量和品质的影响。方法：将草莓植物分别以220（对照），180（轻度亏缺施肥）和/或140 mL / dD（严重亏deficit施肥）的完全营养液施肥，并用PUT（0和2 mM）和/或处理SA（在0和2 mM时）以及在生长阶段进行这些处理的组合。在收获时评估果实的生长，质量参数，产量和植物化学成分。结果：轻度亏缺施肥（MDF）（140 mL / d）显着提高了果实的产量和品质，PUT和SA均增强了MDF对作物生产力的积极影响。SA和PUT减少了DF对作物产量和水果生长的负面影响。结论：本研究结果表明，采用MDF方案以及PUT和SA处理可以大大提高草莓的质量和生产力。