Abstract
The timing of nitrogen (N) fertilizer application has a direct impact on fertilizer use efficiency of potato (Solanum tuberosum L.) and nitrate leaching. The objective of this study was to determine the effect of N fertilizer rate combined with application timing on soil mineral N availability, tuber yield and quality of crisp potato in northeast Florida. Trials were performed on three commercial farms in 2011 and repeated on two farms in 2012. N fertilizer was applied at three different timings: at pre-plant (Npre-pl), at plant emergence (Nemerg) and at tuber initiation (Ntuber init). All seven treatments received a total of 224 kg ha−1 of N, with each treatment differing in the proportion of N supplied at each application timing. N was applied at 0 or 56 kg ha−1 at Npre-pl followed by 0, 56, 112 or 168 kg ha−1 of N applied at Nemerg and 0, 56, 112 or 168 kg ha−1 of N applied at Ntuber init. Treatments were combined in fractional factorial arrangement in a randomized block design with four replicates. Tuber marketable yield ranged from 23.7 to 44.6 Mg ha−1. Total and marketable yields were unaffected by timing or N rate combinations on two out of three farms and tuber quality was mostly unaffected by application timing. Higher yields were obtained when 56 kg ha−1 of N was supplied at pre-plant compared to 0 kg ha−1 of N on only one farm in both years. On the same farm, regardless of the application of 0 or 56 kg ha−1 Npre-pl, the application of 168 kg ha-1 of Nemerg resulted in superior total yields than when 168 kg ha−1 was instead supplied later in the season at Ntuber init. Higher proportions of N at pre-plant and tuber initiation tended to decrease potato tuber size, and a high proportion of N supplied at tuber initiation resulted in lower yield and higher residual soil mineral N at the end of the season.
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Abbreviations
- N:
-
Nitrogen
- Npre-pl :
-
N fertilizer applied at pre-plant
- Nemerg :
-
N fertilizer applied at plant emergence
- Ntuber init :
-
N fertilizer applied at tuber initiation as side-dress
- BMP:
-
Best management practices
- UAN:
-
Urea ammonium nitrate
- AN:
-
Ammonium nitrate
- DAP:
-
Days after planting
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Acknowledgments
This research was supported by the University of Florida Office of the Dean of Research. We would like to thank the potato growers who supported and participated in this research. We would like to acknowledge the staff of the University of Florida—Hastings Agricultural Extension Center in Hastings, FL, Scott Taylor, Bart Herrington, Thaddis Merrick and Hugh Burnham, for their assistance with field operations, sampling and sample analysis.
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Rens, L.R., Zotarelli, L., Cantliffe, D.J. et al. Commercial Evaluation of Seasonal Distribution of Nitrogen Fertilizer for Potato. Potato Res. 59, 1–20 (2016). https://doi.org/10.1007/s11540-015-9304-6
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DOI: https://doi.org/10.1007/s11540-015-9304-6