Optimum Applications of Nitrogen Fertilizer and Water Regime for Wheat (Triticum aestivum L.) Using 15N Tracer Technique under Mediterranean Environment | ||
| Egyptian Journal of Soil Science | ||
| Article 4, Volume 59, Issue 1, March 2019, Pages 41-52 PDF (1003.86 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejss.2019.9863.1250 | ||
| Authors | ||
| Lamy Hamed* 1; Yehia Galal2; Eman Emara3; Mohamed Soliman4 | ||
| 1Soil and Water Department, Faculty of Agriculture, Cairo University, 12613, Giza, Egypt. | ||
| 2Atomic Energy Authority, Nuclear Research Center, Soil and Water Research Department, Abou-Zaabl, Egypt | ||
| 3Agronomy Department, Faculty of Agriculture, Cairo University, 12613, Giza, Egypt | ||
| 4Soil Department, Faculty of Agriculture, Damietta University, Egypt. | ||
| Abstract | ||
| Two field experiments were conducted under two different soil texture located in two sites. Tracing the nitrogen status in wheat plants – soil - environment system using 15N technique under different water regimes was the aim of this investigation. Three nitrogen rates (100, 80 and 60% of the recommended rate with 5% 15N atom excess labeled ammonium sulfate) through two mode of application (Mode A; nitrogen fertilizer rate splitting into three doses: 25, 25, 50% of added rates at seedling, tillering and jointing, respectively, and Mode B; splitting N rate into two doses: 35 % at seedling and 65% at tillering) conjugated with three water regimes (100, 75 and 50% of crop water requirement (CWR)) were applied under clay loam and loamy sand soils conditions. Wheat grain and straw yields were declined by 16.4 and 4.4% in clay loam soil, and by 34.6 and 20.7% in loamy sand soil as water regime reduced from 100 to 50% CWR, respectively. Application of 80% of the recommended N rate recorded the highest grain yield under Mode A, whereas 100% N rate recorded the highest straw yield under Mode B in both soil textures. The moderate rate of N fertilizer (80%, corresponding to 142.4 and 190.4 kg N ha-1 in clay loam and loamy sand soil, respectively) applied with mode A under 75% water regime (4017.7 and 4200.8 m3 applied irrigation water per hectare in clay loam and loamy sand soil, respectively) recorded the highest N uptake by plant, nitrogen use efficiency (NUE) and consequently wheat yield. | ||
| Keywords | ||
| cereal crops; Grain yield; Nitrogen uptake; Nitrogen use efficiency; Soil texture | ||
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