Production and partition of biomass in the sunflower culture submitted to water deficit

Abstract

The great importance of sunflower cultivation is due to the excellent quality of the edible oil that is extracted from its seed, is still tapped in animal feed, for what if obtain elevated productivity is necessary managements based in the local characteristics. The objective of this work was to evaluate the effect of water replacement levels on the production and biomass participation of sunflower cultivars. We conducted the experiment in a greenhouse, located in the Federal Institute of Goiás, Rio Verde Campus. The variables analyzed were partition of biomass of chapter, leaves+stem and root, total production of achenes, weight of achenes full and weight of achenes voids. The experimental design was a randomized complete block design in a 5 x 3 factorial scheme with 3 replicates, were five levels of water replenishment (RH) (20, 40, 60, 80 and 100% of RWC) and three cultivars C) of Atlântica Sementes LTDA (Charrua, Aguará - 6 and Olissun - 3). There was a significant effect in relation to water replenishment (RH) and cultivars (C), no significant result was observed for the interaction HR x C. The cultivar Charrua presented higher values for biomass of the root, participation of achenes, participation of full achenes and participation of achenes achy, being more tolerant to the water deficit. The cultivar Aguará - 6 showed a larger partition of leaf + stem biomass. We found higher production of achenes filled in 100% water replenishment. The filling of achenes depends significantly on the partition of biomass from leaf + stem and strand.