Pepper (Capsicum annuum) response to simulated soil residues of imazamox
2015
Gajić-Umiljendić, Jelena (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Radivojević, Ljiljana (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Šantrić, Ljiljana (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Sarić-Krsmanović, Marija (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Đorđević, Tijana (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Đurović-Pejčev, Rada (Institute of Pesticides and Environmental Protection, Belgrade (Serbia))
A bioassay test was conducted to evaluate the sensitivity of pepper to simulated imazamox residues in loam soil with three different levels of moisture (20, 50 and 70% field water capacity – FWC). The soil concentrations of imazamox were established at: 6.25, 12.5, 25, 50, 100, 200, 400 and 800 µg a.i./kg soil. The parameters measured 21 days after treatment were shoots and roots fresh weight and root length as well as the content of water soluble proteins. Imazamox caused a growth delay and lower protein content at all levels of soil moisture, and the degree of change depended on the application rate. In plants grown in soil with 20% FWC, root fresh weight showed the highest inhibition, root length showed less sensitivity and there was no statistically significant reduction in shoot fresh weight. In soil containing 50% FWC, only the two highest concentrations caused a significant reduction in shoot fresh weight, while root lenght and root fresh weight were inhibited by ≥50 and ≥100 µg a.i./ kg soil, respectively. Root fresh weight was the most sensitive parameter in the soil of 70% FWC, while shoot fresh weight was the least sensitive parameter. Soluble protein contents were lower in all trial variants, but the changes did not depend on herbicide concentration.
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