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- W1444850952 abstract "Field experiments aimed at the fertilizer ~(15)N uptake,accumulation,distribution and use efficiency in fluecured tobacco were conducted using ~(15)N trace technique in yellow soil in Dafang county of Guizhou province.Two organic matter levels(19.2 and 40.70 g/kg) and two N application rates(105 and 82.5 kg/ha) were involved.The results showed that only a small part of fertilizer ~(15)N was absorbed in the first 3-5 weeks after transplanting(WAT).However, ~(15)N accumulation increased rapidly since the fifth WAT and reached its maximum at the 13 WAT.The amount of ~(15)N accumulation were 28.41 and 26.55 kg/ha for two organic matter level soil at harvest.The ~(15)N uptake was increased with increasing N fertilizer applied.Ratio of N from ~(15)N fertilizer to total N uptake decreased as the plant growth stages.It was ranged from 53.84%to 71.33%in the 3-5 WAT and 27.06%to 32.18%in the 17 WAT.The N use efficiency was 1.11%to 7.34%in 3-5 WAT and 28.69%to 29.75%in the 17 WAT.The ~(15)N distribution at upper,middle,lower leaves and stem and flowers accounted for 35.08%to 35.26%,25.87%to 26.19%,17.92%to 18.25%and 22.73%to 24.49%to total ~(15)N uptake respectively.Fertilizer ~(15)N uptake was mainly cumulated in middle and upper leaves.The postponed fertilizer ~(15)N absorption,unsynchronized supplication of soil mineralized N at late growth stage, and higher ~(15)N accumulation in upper and middle leaves of tobacco were the key problems of nutrient management of tobacco to deal with in yellow soil." @default.
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- W1444850952 date "2009-01-01" @default.
- W1444850952 modified "2023-09-27" @default.
- W1444850952 title "Study of 15N accumulation, distribution and utilization in flue-cured tobacco plants on yellow soils." @default.
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