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Influence of time and method of alfalfa stand termination on yield, seed quality, N uptake, soil properties and greenhouse gas emissions under different N fertility regimes

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Abstract

A field experiment was conducted in a 7-year old alfalfa stand to compare the influence of time and method of terminating alfalfa stands on crop yield, seed quality, N uptake and recovery of applied N for wheat (Triticum aestivum L.) and canola (Brassica napus L.), soil properties (ammonium-N, nitrate-N, bulk density, total and light fraction organic C and N), and N2O emissions on a Gray Luvisol (Typic Cryoboralf) loam near Star City, Saskatchewan, Canada. The treatments were a 3 × 3 × 4 factorial combination of three termination methods [herbicide (H), tillage (T), and herbicide + tillage (HT)], three termination times (after cut 1 and cut 2 in 2003, and in spring 2004) and four rates of N (0, 40, 80 and 120 kg N ha−1) applied at seeding to wheat-canola rotation from 2004 to 2007. In the termination year, soil nitrate-N was considerably higher in T or HT treatments than in the H treatment and decreased with delay in termination. In the first crop year, seed and straw yields of wheat grown on T and HT treatments were significantly greater than H alone (by 1,055–1,071 kg seed ha−1 and by 869–929 kg straw ha−1), due to greater content of soil available N in T treatments. Yields decreased with delay in termination time. In general, yield and N uptake in seed and straw, and protein concentration tended to increase with increasing N rate. A greater yield increase occurred on the H compared to T and HT treatments from the first increments of N applied. Nitrous oxide emissions were generally low and there were no treatment differences evident when cumulative 4-year N2O-N losses were compared. Appropriate N fertilization was able to compensate for yield reductions due to delayed termination timing, but could not do so entirely for yield reductions on the H compared to T or HT termination method. The amounts of TOC, TON, LFOC and LFON after four growing seasons were usually higher or tended to be higher under H treatment than under T treatment in the 0–5 cm soil layer, but the opposite was true in the 5–10 cm or 10–15 cm soil layers.

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Acknowledgments

The authors thank Saskatchewan Ministry of Agriculture for financial assistance through Agriculture Development Fund; D. Leach, K. Strukoff, C. Nielsen, K. Hemstad-Falk and several summer students (R. Malmgren, C. Hutchison and T. Donald) for technical help; D. Messer (AAFC Swift Current), C. Fatteicher (Department of Soil Science, University of Saskatchewan) and M. Ayala-Molina (Department of Renewable Resources, University of Alberta) for soil and plant analyses; and Dr. R. Farrell (Department of Soil Science, University of Saskatchewan) for nitrous oxide gas analyses.

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Authors and Affiliations

  1. Agriculture and Agri-Food Canada, P.O. Box 1240, Melfort, SK, S0E 1A0, Canada

    S. S. Malhi

  2. Agriculture and Agri-Food Canada, Swift Current, SK, Canada

    R. Lemke

  3. Department of Soil Science, University of Sask, Saskatoon, SK, Canada

    J. J. Schoenau

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  1. S. S. Malhi
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  2. R. Lemke
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  3. J. J. Schoenau
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Correspondence to S. S. Malhi.

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Malhi, S.S., Lemke, R. & Schoenau, J.J. Influence of time and method of alfalfa stand termination on yield, seed quality, N uptake, soil properties and greenhouse gas emissions under different N fertility regimes. Nutr Cycl Agroecosyst 86, 17–38 (2010). https://doi.org/10.1007/s10705-009-9271-x

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