DOI: 10.5176/2251-189X_SEES17.6
Authors: Khoshnaz Payandeh, Alireza Jafarnejadi, Ali Gholami, Alireza Shokohfar and Ebrahim Panahpor
Abstract: Contamination of agricultural soils with Cd has become one of the most toxic and widespread en-vironmental problems. This research aimed to assess the effects of cropping pattern and different growth stage on soil chemical properties and the cadmium concentration of wheat grain was con-ducted as a split-plot in time experiment based randomized complete block design with three rep-lications At 2014-2015. Cropping pattern in two levels (wheat-rice, fallow-wheat) belonged to main factor and growth stages at three levels (Tillering, flowering, and maturity) belonged to second fac-tor. According result of analysis of variance, effect of cropping pattern on the concentration of total cadmium, absorbable cadmium, Soil Salinity, Soil acidity, Soil organic carbon, Cation exchange ca-pacity, Concentration of soil phosphorus, Lime the soil was significant at 1{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} probability level, but effect of growth stage and interaction effect of treatments only on soil salinity trait were differ-ent. Mean comparison showed rice-wheat crop-ping pattern had higher total cadmium (1.71 mg.kg-1), absorbable cadmium (10.39 ppb), phos-phorus concentrations (9.03 mg.kg-1), soil organic carbon (0.89 {6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}) and soil salinity (3.14 ds.m-1) than To fallow-wheat cropping pattern. According to Test exam difference of grain cadmium concentra-tion between cropping patterns were significant At 1{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} level. Rice-wheat cropping pattern (with an average of 0.31 mg.kg-1) was superior to fallow wheat cropping pattern (0.27 mg.kg-1) which is higher than world health organization standards (0.2 mg.kg-1). About high accumulation of cadmi-um in soil and grain yield at rice-wheat cropping pattern to keep the quality of crop production advised to use standard phosphate fertilizer (main source of cadmium) and crop residue manage-ment.
Keywords: Contamination; Monitor; Rotation
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