Growth and nitrogen nutrition of maize (Zea mays L.) in soil treated with the nitrification-inhibiting insecticide Baythroid |
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Authors: | A. Lodhi F. Azam N. N. Malik |
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Affiliation: | (1) Rhizobiology Laboratory, Soil Biology Division, Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan;(2) Institute of Chemistry, University of the Punjab, Lahore, Pakistan |
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Abstract: | A pot experiment was conducted to compare the uptake and dry matter production potential of NHinf4sup+and NOinf3sup-and to study the effect of Baythroid, a contact poison for several insect pests of agricultural crops, on growth and N uptake of maize (Zea mays L.). Nitrogen was applied as (15NH4)2SO4, K15NO3, or 15NH4NO3 and in one treatment Baythroid was combined with 15NH4NO3. Source of N had, in general, a nonsignificant effect on dry matter and N yield, but uptake of NOinf3sup-was significantly higher than that of NHinf4sup+when both N sources were applied together. Substantial loss of N occurred from both the sources, with NHinf4sup+showing greater losses. Baythroid was found to have a significant positive effect on dry matter yield of both root and shoot; N yield also increased significantly. Uptake of N from both the applied and native sources increased significantly in the presence of Baythroid and a substantial added nitrogen interaction (ANI) was determined. The positive effect of Baythroid was attributed to: (1) a prolonged availability of NHinf4sup+due to inhibition of nitrification, (2) an increased availability of native soil N through enhanced mineralization, and (3) an enhanced root proliferation. |
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Keywords: | ANI Baythroid Cyfluthrin Insecticide 15N Nitrification N uptake Synthetic pyrethroid Zea mays |
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