Some Growth Traits and Durum Wheat Production

Durum wheat production in our environmental conditions is realized by the diffusion of cultivars with high adaptability to environmental stresses. Some of the traditional cultivars posses this characteristics, but they have low productivity, even in favorable conditions. On the other hand, the durum wheat cultivars, created these last years, have high productivity compared with the traditional ones. But sowing these new cultivars in traditional environments, is associated with some problems, because they are considered as cultivars with high demands in relation to growing conditions. These new cultivars, anyhow, have a physiological construction suitable to response better in different environments. The aim of this study was to determine eventual changes in dry matter accumulation and size of leaf area, and to determine the influence of NAR, LAD, G/LAD, HI values on grain production of four durum wheat genotypes. According to the achieved results, it was evident that the above mentioned physiological traits, have influence on plant productivity. The values of LAI, LAD and G/LAD after heading had higher effect on productivity. Some of the studied genotypes (Valforte, 5/11-1) realize their productivity due to high values of LAD, while some others ( Creso, N-24) due to better values of G/LAD. Finally, cultivars (or genotypes) like 5/-11-1, with high values of LAD after heading are suitable for optimal environments, while cultivars with short vegetative period, small values of LAD, LAI, and with high values of G/LAD like N-24 are suitable for limited environments