Organic onion growth, yield and storage improved by foliar sprays of microalgae and fulvic acid as a natural biofertilizer

The use of microalgae as natural biofertilizer in horticulture has recently been reported, while the humic substances is widespread. However, combined with applied to plant leaves still unexploited. Thus, objective this work was combine fulvic acid (FA) Scenedesmus subspicatus microalga biomass (SC) a via leaf two onion cultivars organic system. Four experiments were conducted: i) bioassays verify bioactive effect FA, SC and combinations using Vigna radiata model plant; ii) greenhouse pot experiment foliar applications combination cultivars; iii) field system iv) bulb storage experiment. SC, FA their identified by promoting changes root growth V. radiata. In pots, treatments containing promoted increase fresh dry mass. application an productivity, reduced mass loss stored bulbs increased carbohydrate, amino protein contents bulbs.