Organic Amendments Addition on Altering the Sorption, Vertical Movement and Leaching Behavior

Herbicides are used indiscriminately to attain maximum weed control in agricultural result which ability contaminate the food chain through the biography-augmentation of silt concentration in soil. One of the management submitted to overcome the herbicides contamination is acting with differing organic amendments. Hence the lab column emptying and sorption experiments were conducted in Tamil Nadu Agricultural University (TNAU), Coimbatore to investigate the draining behavior of herbicides namely., pendimethalin, atrazine and imazethapyr in soil as influenced by miscellaneous organic amendments used @ 5t/ha viz., FYM, vermicompost, make ready to bear coir pith, maize crop residue and biochar. Leaching experiment was administered using PVC processions of 45 cm length and the sorption study was conducted utilizing different concentrations of preferred herbicides as per OECD guidelines. Results granted that leaching and movement attitude of the studied herbicides in soil was changed by the applied natural amendments specifically the biochar and maize crop residue. Biochar medicated soil retained 29.76, 40.20, and 38.07 percent of the used pendimethalin, atrazine and imazethapyr respectively in surface 0-15 cm wisdom and reduced its flow to lower depths and to leachates. Herbicides adsorption was larger with biochar and is indicated for one Koc values of 225, 184 and 22 mg/L for pendimethalin, atrazine and imazethapyr individually and was followed for one maize crop residue. It is concluded that the request of biochar @ 5t/ha as organic improvement is efficient in decreasing the herbicides activity viz., pendimethalin, atrazine and imazethapyr and lessening their sorption and leaching potential to groundwater.

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