PDF(Pubmed)
Abstract：
In regions facing water scarcity and soil salinity, mitigating these abiotic stresses is paramount for sustaining crop production. This study aimed to unravel the synergistic effects of organic matter and phosphorus management in reducing the adverse effect of saline water for irrigation on red pepper (Capsicum annuum L.) production, fruit quality, plant physiology, and stress tolerance indicators. The study was carried out in the arid Tadla region of Morocco and involved two key experiments: (i) a field experiment during the 2019 growing season, where red pepper plants were subjected to varying phosphorus fertilizer rates (120, 140, and 170 kg of P2O5.ha-1) and saline water irrigation levels (0.7; 1.5; 3; and 5 dS.m-1); and (ii) a controlled pot experiment in 2021 for examining the interaction of saline water irrigation levels (EC values of 0.7, 2, 5, and 9 dS.m-1), phosphorus rates (30, 36, and 42 kg of P2O5.ha-1), and the amount of organic matter (4, 8, 12, and 16 t.ha-1). The field study highlighted that saline irrigation significantly affected red pepper yields and fruit size, although phosphorus fertilization helped enhance productivity. Additionally, biochemical markers of stress tolerance, such as proline and glycine betaine, along with stomatal conductance, were impacted by increasing salinity levels. The pot experiment showed that combining organic amendments and phosphorus improved soil properties and stimulated red pepper growth and root weight across all salinity levels. The integration of phosphorus fertilization and organic amendments proved instrumental for counteracting salinity-induced constraints on red pepper growth and yield. Nonetheless, caution is necessary as high salinity can still negatively impact red pepper productivity, necessitating the establishment of an irrigation water salinity threshold, set at 5 dS.m-1.
摘要：
在面临缺水和土壤盐分的地区，减轻这些非生物胁迫对于维持作物产量至关重要。这项研究旨在阐明有机物和磷管理在减少盐水灌溉对红辣椒（CapsicumannuumL.）生产的不利影响方面的协同作用。水果品质,植物生理学,和抗逆性指标。该研究在摩洛哥干旱的塔德拉地区进行，涉及两个关键实验：（i）2019年生长季节的田间试验，其中红辣椒植物受到不同的磷肥施用量（120、140和170kgP2O5。ha-1）和盐水灌溉水平（0.7;1.5;3;和5dS。m-1）；（ii）2021年进行的受控盆栽实验，以检查盐水灌溉水平的相互作用（EC值为0.7、2、5和9dS。m-1),磷率(30、36和42千克P2O5。ha-1),和有机物的含量(4、8、12和16t.ha-1)。田间研究强调，盐水灌溉显着影响红辣椒的产量和果实大小，尽管磷肥有助于提高生产力。此外,胁迫耐受性的生化标记，如脯氨酸和甘氨酸甜菜碱，随着气孔导度，受到盐度水平增加的影响。盆栽试验表明，有机改良剂和磷的结合改善了土壤特性，并在所有盐度水平上刺激了红辣椒的生长和根重。磷肥和有机改良剂的整合被证明有助于抵消盐度对红辣椒生长和产量的限制。尽管如此，谨慎是必要的，因为高盐度仍然会对红辣椒的生产力产生负面影响，需要建立灌溉水盐度阈值，设置为5dS。m-1.
