The Periodic Variation in Iron Availability in Soils Affected by Saline Water Conditions

An incubation study was carried out at Department of Soil Science and Agricultural Chemistry, College of Agriculture, AAU, Vaso for 60 days to find out the effect of Fe nanoparticles on periodical availability of iron in soil under saline water condition with different levels of Fe nanoparticle with two types of irrigation water in loamy sand soil. The treatments were repeated thrice adopting CRD factorial (2 factors) design. Irrigation water samples was drawn as per standard protocol and important chemical parameters were analyzed. The 100 g soils were treated in plastic beaker with seven levels of Fe nanoparticle (0, 0.2, 0.4, 0.6, 0.8, 1.0 and 5.0 mg Fe/kg soil) and three level of FeSO4 (2.5, 5.0 and 10.0 mg/kg) under saline water condition i.e (i) High saline water (EC > 4dSm-1) and Low saline water (EC < 1dSm-1). The four sampling was done at an interval of time i.e 10, 20, 40 and 60 days after treatment. Each set was completely withdrawn after 10, 20, 40 and 60 days and was analyzed for DTPA-Fe. The DTPA extractable Fe content after 10, 20, 40, 60 days of incubation in soil was significantly decreased due to high saline irrigation water (EC > 4dS m-1) over low saline irrigation water (EC < 1dS m-1). The significantly highest DTPA-Fe content (6.83, 7.58, 8.32 and 8.48 mg kg-1) was recorded at 10, 20, 40 and 60, respectively days after incubation due to 10.0 mg kg-1 soil through FeSO4 application, which was found at par with treatment 5.0 mg Fe kg-1 soil through FeSO4 or Fe nanoparticles. The DTPA-Fe availability adversely affected over the time under high saline irrigation water condition.