Abstract

CARPANETO, B; LORENZO, M  and  ABBATE, P.E. Efecto de la fertilización nitrogenada en soja intersembrada en trigo en Balcarce. RIA. Rev. investig. agropecu. [online]. 2014, vol.40, n.1, pp.54-59. ISSN 1669-2314.

It is known that soybean intercropping in wheat has low initial growth, which could affect negatively the formation of nodules and limit the soybean growth after harvest of wheat. In this paper we proposed to: (i) confirm whether soybean-wheat intercropping has response to nitrogen fertilization and (ii) evaluate the optimum N rate of soybean intercropping. Two experiments were conducted in wheat-soybean intercropping irrigated crops in Balcarce, with treatments of nitrogen fertilization. In the first year fertilization levels were zero and 530 kg N/ha (equivalent to N requirement of soybean). In the second year we evaluated four fertilization levels calculated as a proportion of the dose of indifference (204 kg N ha-1): 0, 51, 102 and 204 kg N ha-1. At maturity yield, harvest index, weight per grain, total crop dry weight and number of grains m-2 were measured. Results show significant responses of soybean to nitrogen fertilization: low N doses (equivalent to 1/4 of the dose of indifference) were sufficient to maximize crop performance. Both experiments confirm that soybean yield increases by applied N increased biomass returns to the system.

Keywords : Soybean growth; N dose; Yield; Biomass; Intercropping.

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