A Modified DMT-HFO Technique for Investigating the Kinetics of Phosphorus Desorption from Calcareous Soils and its Relationship with Maize Growth

作者：Reyhanitabar, Adel^*; Heidari, Saber; Oustan, Shahin; Gilkes, Robert

来源：Communications in Soil Science and Plant Analysis, 2018, 49(11): 1281-1288.

DOI：10.1080/00103624.2018.1457156

• Calcareous soil
• phosphorus
• soil chemistry

In this research, phosphorus (P) desorption was investigated using DMT-HFO as an infinite sink for 10 calcareous soils over a period of 1-35 days and the kinetic data was related to soil properties and P uptake by maize (Zea mays L.). First- and second-order, and simple Elovich equations adequately described P desorption kinetics, however parabolic, exponential and zero order equations provided the best fits to the data. A systematic relationship exists between the second order rate parameter (k(2)) and the clay content of the soils. There are positive relationships between P desorption rate constants (for zero order, Elovich and parabolic equations), and both dry matter and P content of maize shoots and also for roots. These relationships indicate that P desorption rate may be a limiting factor for maize growth in these soils. The DMT-HFO technique may be used to assess the long-term availability of P to plants.

• 出版日期2018