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Effects of Irrigation Water Quality and Nitrogen Rate on the Recovery of 15N Fertilizer by Sorghum in Field Study
- Khelil, Mohamed Naceur, Rejeb, Saloua, Henchi, Belgacem, Destain, Jean Pierre
- Communications in soil science and plant analysis 2013 v.44 no.18 pp. 2647-2655
- Sorghum bicolor subsp. drummondii, ammonium nitrate, fertilizer rates, field experimentation, irrigation water, nitrogen, nitrogen fertilizers, soil, wastewater, wastewater irrigation, water quality
- The effects of ¹⁵N-labeled ammonium nitrate on yield, uptake of nitrogen (N) by sorghum (Sorghum sudanense , Piper), and on N remaining in the soil were studied in a field experiment with different N rates (0, 50, and 100 kg N ha ⁻¹) and with two irrigation water qualities, well water (WW) and treated wastewater (TWW). Treated wastewater irrigation increased dry matter and N yield compared to WW. At equal N rates, recovery of ¹⁵N-labeled fertilizer by plants increased with TWW irrigation compared to WW (36% versus 23%). Neither fertilizer rate nor water quality had an effect on the ¹⁵N-labeled fertilizer remaining in the 0- to 60-cm layer of soil. On average 41% in the TWW treatment (49–33%) and 38% in WW treatment was mostly present in the surface 20-cm layer. Losses of ¹⁵N-labeled fertilizer were unaffected by irrigation water quality (35%) and increased with N application rate in TWW (4% versus 31%).