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Effects of mulch, N fertilizer, and plant density on wheat yield, wheat nitrogen uptake, and residual soil nitrate in a dryland area of China

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Abstract

Understanding mulching influences on nitrogen (N) activities in soil is important for developing N management strategies in dryland. A 3 year field experiment was conducted in the Loess Plateau of China to investigate the effects of mulching, N fertilizer application rate and plant density on winter wheat yield, N uptake by wheat and residual soil nitrate in a winter wheat-fallow system. The split plot design included four mulching methods (CK, no mulch; SM, straw mulch; FM, plastic film mulch; CM, combined mulch with plastic film and straw) as main plot treatments. Three N fertilizer rates (N0, 0 kg N ha−1; N120, 120 kg N ha−1; N240, 240 kg N ha−1) were sub-plot treatments and two wheat sowing densities (LD, low density, seeding rate = 180 kg ha−1; HD, high density, seeding rate = 225 kg ha−1) were sub-subplot treatments. The results showed that wheat yield, N uptake, and N use efficiency (NUE) were higher for FM and CM compared to CK. However, soil nitrate-N contents in the 0–200 cm soil profile were also higher for FM and CM compared to CK after the 3 year experiment. Wheat grain yields were higher for SM compared to CK only when high levels of nitrogen or high planting density were applied. Mulching did not have a significant effect on wheat yield, nitrogen uptake and NUE when soil water content at planting was much high. Wheat yield, N uptake, and residual nitrate in 0–200 cm were significantly higher for N240 compared to N120 and N0. Wheat yield and N uptake were also significantly higher for HD compared to LD. When 0 or 120 kg N ha−1 was applied, HD had more residual nitrate than LD while the reverse was true when 240 kg N ha−1 was applied. After 3 years, residual nitrate-N in 0–200 cm soil averaged 170 kg ha−1, which was equivalent to ~40% of the total N uptake by wheat in the three growing seasons.

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Acknowledgments

The research was supported by grants from The National Natural Science Foundation of China (Nos. 40471069, 30230230, 40201028) and National Key Technology R&D Program (2008BADA4b09). We thank Dr. Marco Roelcke from Braunschweig Technical University, Germany, and Dr. William J. Gale, Northwest A&F University, for their linguistic revisions and suggestions to the manuscript.

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Authors and Affiliations

  1. College of Resources and Environment, Northwest A&F University, 712100, Yangling, China

    Yajun Gao & Yun Li

  2. Yangling Vocational and Technical College, 712100, Yangling, China

    Jianchang Zhang, Wenguo Liu, Zhanping Dang, Weixian Cao & Qin Qiang

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  1. Yajun Gao
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Correspondence to Yajun Gao.

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Gao, Y., Li, Y., Zhang, J. et al. Effects of mulch, N fertilizer, and plant density on wheat yield, wheat nitrogen uptake, and residual soil nitrate in a dryland area of China. Nutr Cycl Agroecosyst 85, 109–121 (2009). https://doi.org/10.1007/s10705-009-9252-0

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