Resumo

VAZQUEZ-GALVEZ, Gilberto; CARDENAS-NAVARRO, Raúl  e  LOBIT, Philippe. Effect of nitrogen on growth and yield of strawberry irrigated on drip and gravity systems. Agric. Téc. Méx [online]. 2008, vol.34, n.2, pp.235-241. ISSN 0568-2517.

Strawberry production is the major producer of employ in the field in the valley of Zamora, Michoacan, Mexico. This horticultural crop is also one of the most important consumers of nitrogen fertilizers, which are applied in very high quantities (>600 kg N ha^-1). The aim of this work was to generate local information about the effect of the nitrogen supply on plant growth and production, as well as nitrogen use efficiency and water use efficiency, in strawberry plants grown under two irrigation systems: drip and gravity. The effect of increased doses of nitrogen was evaluated in drip and gravity irrigation systems (0, 23, 77, 231, 693 y 1 537 kg de N ha^-1). The results show a significant decrease in plant dry matter when irrigation changed from drip to gravity. When plants are supplied with 231, 693 and 1 537 kg de N ha^-1 dry matter production increased. Nevertheless, the change from 231 to 693 and from 231 to 1 537 kg de N ha^-1, involve an increase of 3 and 6.6 times respectively in the quantity of fertilizer and represents proportional economic increases. The water consumption in drip irrigation was 21% minor, but his efficiency in the production of fruit was 29% higher. The efficiency of nitrogen in fruit production in drip irrigation was 19% greater than the obtained on gravity system.

Palavras-chave : Fragaria x ananassa; drip and gravity irrigation systems, Duch.; growth and fruit production.

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