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- W1531696222 abstract "The first project involved the evaluation of different times of application on the fertilizer nitrogen recovery (FNR) in the soil-plant system in an irrigated upland cotton system, during two seasons. This was accomplished by using the isotopic dilution technique applying the N to microplots. No differences were observed in the total plant FNR, seed and stover, soil and the total FNR among the different N application times; however, despite no differences were observed in the plant the FNR value ranged from 30-38%, while the seed exhibited the highest FNR with an average over 50% of the N recovered in the plant. In the soil, the obtained average FNR value was over 40% while the total FNR (plant + soil) ranged from 70-80%, being reduced as the N application time was delayed. The second project was conducted during two seasons to examine the N and bromide distribution pattern in the soil profile as a function of the time of application. Nitrogen and bromide were applied to the soil at three different times in a cotton growth cycle; after that, soil samples were taken at the end of the cotton cycle to a depth of 1.80 m., and N and bromide recoveries were determined. Slightly higher FNR were obtained with the intermediate application time. The higher FNR were detected in the surface layer (0-30 cm) with an average of 40%. Below 30 cm depth, low N recoveries were obtained and even lower below the 60 cm soil layer. Bromide recovery behavior was related to the water movement in the soil profile: as the Br application time was delayed more of the anionic tracer was found in the top of the soil profile, while less Br was found in the surface soil for the early Br application time." @default.
- W1531696222 created "2016-06-24" @default.
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- W1531696222 date "2007-01-01" @default.
- W1531696222 modified "2023-09-27" @default.
- W1531696222 title "Fertilizer Nitrogen Recovery and N15 and Bromide Distribution in the Soil Profile as Affected by the Time of Application on an Irrigated Upland Cotton (Gossypium hirsutum L.)" @default.
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