Galantini J.A., J.O. Iglesias, A.M. Miglierina, R.A. Rosell, A. Glave. 1992. Rotación y fertilización en sistemas de producción de la región semiárida argentina. I. Productividad (calidad y rendimiento) del trigo. Rev. Fac. Agronomía (U.B.A.) 13 (1) 67-75. (in Spanish)
In the semi-arid region of the Buenos Aires province the effect of 12 years of different crop rotations with wheat (Triticum aestivum) on crop productivity was studied. The rotations were: TV, wheat-winter and summer grasses; TI, wheat-winter grasses; TPa wheat-alfalfa (Medicago sativa) pasture; TPc, wheat-mixed pasture. All divided into treatments without (nf) and with (f) fertilizer (N and P every year) application. Wheat-grazing, the typical of the region included rotation. production of total dry matter aerial (MSTA), grain, straw, protein and N content in grain and straw were evaluated. The inclusion of annual grasses into crop rotation produced a initial positive effect on crop performance and increased grain yield, however, grain quality were not modified. Fertilization increased wheat grain yields, but in TV only quality was improved. Pasture in rotation with grain yield was similar, but the response to fertilization was significant only in TPc. Alfalfa as predecessor improved wheat dry matter quality, however, grain yield was not increased.
Key words: Crop-rotation, wheat productivity, semi-arid region