Journal Title
Title of Journal: Nutr Cycl Agroecosyst
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Abbravation: Nutrient Cycling in Agroecosystems
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Publisher
Springer Netherlands
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Authors: Vu Dinh Tuan Thomas Hilger Tran Duc Vien Georg Cadisch
Publish Date: 2014/11/19
Volume: 101, Issue: 1, Pages: 17-36
Abstract
We conducted a field experiment on a 53 slope in Northwest Vietnam using 15Nlabelled urea to trace its fate in maize Zea mays under intensive tillage and fertilization T1 control versus maize with Panicum maximum grass barriers T2 under minimum tillage MT with Arachis pintoi as cover crop T3 or relay cropped with Phaseolus calcaratus T4 15Nlabelled urea was applied to one maize row at the top of each plot one year after trial establishment At harvest 216 of the labelled 15N were recovered by maize in T1 89 in T2 29 in T3 and 309 in T4 In T2 maize and P maximum competed heavily for N with a total 381 of 15N recovered in barriers Less than 6 of 15N applied was found in maize rows along the slope regardless of the treatment MT reduced 15N translocation to deeper soil layers 40–80 cm indicating a safety net function Less than 01 kg N ha−1 of applied 15N reached the collection devices at the bottom of plots the majority of added 15N was intercepted by plants along the slope Current farming practice T1 induced a negative N balance of −142 kg N ha−1 in which residue burning and erosion were major pathways for N losses Reduced N losses by erosion in T2 contributed to a less negative N balance as compared to T1 Positive N balances of MT treatments were associated with strongly reduced N losses by erosion and abandonment of burning residues indicating a viable option for hillside croppingThe authors would like to thank ADB through Agricultural Science and Technology ProjectVietnam and EnBW Rainforest Foundation for funding this research Nguyen Van Thach Lu Van Hoa Lo Van Tien and Ha Van Phuong for field assistance Andreas Treichel Dang Thi Thanh Hue Elke Dachtler Stefan Becker Fazekas and Christian Brandt for the laboratory support We also thank Prof Karl Stahr Dr Gerhard Clemens for their logistic support and advice on experimental setup and Dr Michael Scott Demyan for his comments on an earlier version of this paper
Keywords:
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- Forecasting long-term global fertilizer demand
- 15 N tracer technique analysis of the absorption and utilisation of nitrogen fertiliser by potatoes
- Nitrogen, phosphorus, and potassium budgets in Indian agriculture
- Effects of different manuring systems with and without biogas digestion on nitrogen cycle and crop yield in mixed organic dairy farming systems
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- Accumulation of phosphorus fractions in typic Hapludalf soil after long-term application of pig slurry and deep pig litter in a no-tillage system
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