Rui Su1,2, Zekun Zhang1,2, Chao Chang1,2, Qi Peng3,4, Xiao Cheng1,2, Jiayin Pang5,6, Honghua He1,2,3,7, Hans Lambers6,7,8. 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China. 2. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, China. 3. Chinese Academy of Sciences and Ministry of Water Resources, Institute of Soil and Water Conservation, Yangling, Shaanxi, China. 4. University of Chinese Academy of Sciences, Beijing, China. 5. UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia. 6. The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, Australia. 7. School of Biological Sciences, The University of Western Australia, Perth, WA, Australia. 8. Department of Plant Nutrition, China Agricultural University, Beijing, China.
Abstract
BACKGROUND AND AIMS: Soil phosphorus (P) deficiency and salinity are constraints to crop productivity in arid and semiarid regions. Salinity may weaken the effect of P fertilization on plant growth. We investigated the interactive effects of soil P availability and salinity on plant growth, P nutrition and salt tolerance of two alfalfa (Medicago sativa) cultivars. METHODS: A pot experiment was carried out to grow two cultivars of alfalfa in a loess soil under a combination of different rates of added P (0, 40, 80 and 160 mg P kg-1 soil as monopotassium phosphate) and sodium chloride (0, 0.4, 0.8 and 1.6 g NaCl kg-1 soil). Plant biomass, concentrations of P ([P]), sodium ([Na]) and potassium ([K]) were determined, and rhizosheath carboxylates were analysed. KEY RESULTS: There were significant interactions between soil P availability and salinity on some, but not all, of the parameters investigated, and interactions depended on cultivar. Plant growth and P uptake were enhanced by P fertilization, but inhibited by increased levels of salinity. Increasing the salinity resulted in decreased plant P-uptake efficiency and [K]/[Na]. Only soil P availability had a significant effect on the amount of tartrate in the rhizosheath of both cultivars. CONCLUSIONS: Increased salinity aggravated P deficiency. Appropriate application of P fertilizers improved the salt tolerance of alfalfa and increased its productivity in saline soils.
BACKGROUND AND AIMS: Soil phosphorus (P) deficiency and salinity are constraints to crop productivity in arid and semiarid regions. Salinity may weaken the effect of P fertilization on plant growth. We investigated the interactive effects of soil P availability and salinity on plant growth, P nutrition and salt tolerance of two alfalfa (Medicago sativa) cultivars. METHODS: A pot experiment was carried out to grow two cultivars of alfalfa in a loess soil under a combination of different rates of added P (0, 40, 80 and 160 mg P kg-1 soil as monopotassium phosphate) and sodium chloride (0, 0.4, 0.8 and 1.6 g NaCl kg-1 soil). Plant biomass, concentrations of P ([P]), sodium ([Na]) and potassium ([K]) were determined, and rhizosheath carboxylates were analysed. KEY RESULTS: There were significant interactions between soil P availability and salinity on some, but not all, of the parameters investigated, and interactions depended on cultivar. Plant growth and P uptake were enhanced by P fertilization, but inhibited by increased levels of salinity. Increasing the salinity resulted in decreased plant P-uptake efficiency and [K]/[Na]. Only soil P availability had a significant effect on the amount of tartrate in the rhizosheath of both cultivars. CONCLUSIONS: Increased salinity aggravated P deficiency. Appropriate application of P fertilizers improved the salt tolerance of alfalfa and increased its productivity in saline soils.
Authors: Erik J Veneklaas; Hans Lambers; Jason Bragg; Patrick M Finnegan; Catherine E Lovelock; William C Plaxton; Charles A Price; Wolf-Rüdiger Scheible; Michael W Shane; Philip J White; John A Raven Journal: New Phytol Date: 2012-06-12 Impact factor: 10.151
Authors: Mart B H Ros; Gerwin F Koopmans; Kees Jan van Groenigen; Diego Abalos; Oene Oenema; Hannah M J Vos; Jan Willem van Groenigen Journal: Sci Rep Date: 2020-10-20 Impact factor: 4.379
Authors: Mohamed A Abd El-Hady; Yasser M Abd-Elkrem; Mohamed O A Rady; Elsayed Mansour; Khaled A El-Tarabily; Synan F AbuQamar; Mohamed E El-Temsah Journal: Front Plant Sci Date: 2022-08-04 Impact factor: 6.627