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The objective of this work was to evaluate the effect of different doses of phosphorus in the growth and development of amaranth plants and in the physiological quality of the seeds produced, as well as to identify the interrelationships between the morphological and physiological attributes. The experiment was carried out in the agricultural crop 2016/2017 in Federal University of Pelotas. The experimental design was a randomized block in which the treatments were arranged in five replications. The analysis of variance revealed a significance of 5% probability through the characters, plant height, dry mass of the plant shoot, seed yield, germination and accelerated aging these results demonstrate that these attributes are influenced by the P2O5 doses, in contrast, the chlorophyll index. The Amaranthus cruentus species expresses variability to the morphological attributes, yield components and seed quality produced in relation to the use of phosphate fertilization. Doses comprising 100 to 200 kg ha of P2O5 tend to potentiate plant height, dry biomass accumulation, yield, germination and vigor of the seeds produced. Plants with greater stature and accumulation of biomass increase the proportion of photosynthetic pigments, being these determinants for the production and quality of seeds produced of amaranth in the extreme south of Brazil.

Phosphate fertilization and inter-relationships of the agronomic and physiological characters of amaranth seeds