Resumo

LAZARO, L.; ABBATE, P.E.  e  MANFREDA, V.T.. Incidence of the differences in the amount of P exported between wheat cultivars. Agriscientia [online]. 2012, vol.29, n.1, pp.1-13. ISSN 1668-298X.

Phosphorus (P) is one of the least available macronutrients in soil and a rise in the use of phosphate fertilizers was predicted due to the growing food demand. A practice that can contribute to a more efficient use of P fertilizers and reduce soil P extraction is the selection of cultivars with low concentration of P in grains. In order to find out if there are differences in P concentration in wheat cultivars that are currently used in Argentina, 66 cultivars, grouped in two sowing dates, during 2008/09 and 2009/10, were compared in Balcarce, under potential conditions. There were differences between cultivars in P concentration, P exportation and yield (ranges were: 0.22 - 0.38%; 5170 - 9740 kg/ha and 13 - 29 kg P/ha) for P concentration in grains, yield and P export, respectively). However, when considering the economic implications for farmers of using cultivars with lower P concentration, these differences between cultivars were not relevant, since the differences in cost were less than 2% yield, while at long-term and for country (Argentina), these differences have another dimension.

Palavras-chave : Exportation phosphorus; Phosphorus concentration; Wheat yield.

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