In this study, Lettuce (Lactuca Sativa) and Spinach (Spinacea Oleracea) were used as a case study vegetable crop to compare models for estimating Fertilizer Use Efficiency based on nitrogen and phosphorous fertilizer and nitrate concentration. Field studies were conducted to measure yield, nitrate, Fertilizer Use Efficiency, response to applied Nitrogen and phosphorous fertilizer in two plants. The area was located between 25° 21Î„ E longitude and 51Ëš38Î„ N latitude in the North of Varamin city, (Tehran province, Iran) in the alluvial plain of Varamin. Soils family were fine, mixed, active, thermic, typic haplocambids based on Soil Taxonomic system (1999). Plants were received five rates of Nitrogen (0.0, 150, 200, 250 and 300 kg Nha-1) as a urea in split applications and five rates of Phosphorous (0.0, 37.5, 50, 62.5 and 75 kg P2O5
ha-1) as a triple super phosphate (TSP). Data for plant fresh mass (tonha-1) and Nitrate uptake (nitrate) (mgkg-1) were recorded. Models were described the data for cultivar quite well, with correlation coefficients of 0.80 and above. All of models for Lettuce and Spinach production were compared graphically and analytically. The model coefficients were then used to make improved estimates of fertilizer recommendations for field production of Lettuce and Spinach in Iran. Results showed that most suitable mode for prediction of fertilizer use efficiency was Y=16.77+0.0522N+0.0576P (R2=0.81) in lettuce (N: kg and P: kg P2O5ha-1 in lettuce. Based on we could predicted fertilizer use efficiency that help to agricultural practice management until nitrogen and phosphorous fertilizers used suitable and avoid leaching of nitrogen in lettuce culture.
Key words: Fertilizer use efficiency, lettuce, spinach.
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