Absorcion de nitrogeno (15N) y productividad del agua por el cultivo de fresa (Fragaria x ananasa) en "El Bajio", Mexico | Nitrogen (15N) uptake and water productivity by strawberry (Fragaria x ananasa) in "El Bajio", Mexico
2002
Monroy, J. | Vera-Nunez, J.A. | Carrera, M.A. | Grageda-Cabrera, O.A. | Pena-Cabriales, J.J.
In Irapuato, Guanajuato, Mexico, strawberry crops represent an important source of jobs for many people, particularly women. Traditionally, the crop is fertilized with high a rate of N (350-500 kg N ha(-1)). Thus, the objectives in this study were 1) to quantify the nitrogen uptake derived from fertilizer by the crop through the 15N isotopic technique, and 2) to quantity the water productivity. A strawberry crop cv. Chandler was transplanted to the field and fertilized with 300 kg N ha(-1) as ammonium sulphate 1% 15N atoms excess. The fertilization was split in three applications of 100 kg N ha(-1) at 30, 91 and 157 days after transplanting (dat). The lowest N-efficiency occurred in the period 0-64 dat (7%). The berries always showed the lowest N-efficiency (< 1%). The N-efficiency occurred in stage 64-91 dat. The highest N uptake from fertilizer occurred during the periods 64-91, 128-157, and 188-219 dat. In relation to water, the results indicate "poor" water productivity. The highest value observed occurred between 157-188 dat and is directly related to peak biomass accumulation. The calculated value of water productivity is 1.6 m3 kg(-1) fruit. Our data illustrate the need to continue with studies focused on the optimization the N-fertilizer and water.
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