Journalartikel
Autorenliste: He, Mengqiu; Meng, Lei; Chen, Shending; Dan, Xiaoqian; Zhao, Chang; He, Xiaoxiang; Cai, Zucong; Zhang, Jinbo; Müller, Christoph
Jahr der Veröffentlichung: 2022
Seiten: 2847-2856
Zeitschrift: Journal of Soil Science and Plant Nutrition
Bandnummer: 22
Heftnummer: 3
ISSN: 0718-9508
eISSN: 0718-9516
DOI Link: https://doi.org/10.1007/s42729-022-00850-8
Verlag: Springer
Abstract:
Maize (Zea mays L.) N uptake affects N use efficiency (NUE), which is affected by the N form for uptake. However, maize N preference for NH4+ or NO3- is unclear. A field experiment and a (15) N tracing study was conducted with various soils differing in pH plant with maize. Maize N (NO3- and NH4+) uptake rate significantly varied with soil pH, but NO3- uptake rate (U-NO3) was much higher than NH4+ uptake rate (U-NH4) irrespectively of the pH, i.e., maize generally preferred NO3- uptake over NH4+ at the seedling stage. The generally higher U-NH4 and U-NO3 in acidic compared to alkaline soils in the laboratory study were consistent with the maize yield in the field experiment results. The positive relationship between U-NO3 and U-NH4 (P < 0.01) indicated a synergistic effect between NH4+ and NO3- uptake. The longer NH4+ residence time could explain the higher NH4+ and total N uptake rates in acidic soil than alkaline soil. With maize planted, the rate of autotrophic nitrification (O-NH4) reduced between 30 and 75% compared to unplanted soils supporting N uptake via a prolonged NH4+ residence time. The rate of heterotrophic nitrification (O-Nrec) was stimulated by maize plants, accounting for up to 45% of total NO3- production in acidic soils. The role of O-Nrec was illustrated by a positive correlation of O-Nrec/(O-NH4 + O-Nrec) with U-NO3 (P < 0.01). Maize seedling preferred NO3- over NH4+ irrespectively of pH. Moreover, maize can regulate soil N supply through interactions between plant and soil N transformations to meet their N acquisition.
Zitierstile
Harvard-Zitierstil: He, M., Meng, L., Chen, S., Dan, X., Zhao, C., He, X., et al. (2022) Maize Seedlings Prefer NO3− Over NH4+ Independent of pH Changes, Journal of Soil Science and Plant Nutrition, 22(3), pp. 2847-2856. https://doi.org/10.1007/s42729-022-00850-8
APA-Zitierstil: He, M., Meng, L., Chen, S., Dan, X., Zhao, C., He, X., Cai, Z., Zhang, J., & Müller, C. (2022). Maize Seedlings Prefer NO3− Over NH4+ Independent of pH Changes. Journal of Soil Science and Plant Nutrition. 22(3), 2847-2856. https://doi.org/10.1007/s42729-022-00850-8
