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A 3-year field experiment was carried out in southern Italy to evaluate the effect of different combinations of nitrogen (N) fertilizer rates (0, 55, 90, 135 kg ha-1), time of application (sowing, tillering, stem elongation) and number of nitrogen applications on durum wheat (Triticum turgidum L., var. durum). A total of eight different combinations - in terms of quantity and time of application - were arranged in a randomized complete block design with four replications. Soil plant analysis development was analysed along with leaf area index, grain and straw yield, plant height, plant lodging, thousand-kernel weight, non-vitreous kernels, shrunken and discarded kernels, hectolitre weight, grain protein content, and sodium dodecylsulfate sedimentation. Nitrogen contents of soil, grain and straw were measured in order to assess nitrogen efficiency. The results showed the positive effect of increased nitrogen dosages of 90 and 135 kg ha-1. The optimization of nitrogen administration increased by splitting the nitrogen into three application times, as shown by the eco-physiological, productive and qualitative parameters, and the nitrogen efficiency parameters measured (N application efficiency and N recovery fraction). © L. Tedone et al., 2014 Licensee PAGEPress, Italy

Optimising nitrogen in order to improve the efficiency, eco-physiology, yield and quality on one cultivar of durum wheat