Humic substances (HS) are dominant components of soil organic matter and are recognized
as natural, effective growth promoters to be used in sustainable agriculture. In recent years …

Plant biostimulants are specialty products used to increase crop production and are quickly
becoming common in the agricultural seed and chemical marketplace. Unlike traditional …

Improvement of plant iron nutrition as a consequence of metal complexation by humic
substances (HS) extracted from different sources has been widely reported. The presence of …

The ability of rhizospheric humic substances to improve plant growth has been well
established by many studies carried out using diverse plant species cultivated under many …

The demand for biostimulants has been growing at an annual rate of 10 and 12.4% in
Europe and Northern America, respectively. The beneficial effects of humic substances (HS) …

The increasing global demand for food production, often causing excessive use of chemical
fertilizers, has led to the deterioration of soil health. Immediate action is required to restore …

There has been much soil phosphorus (P) research in the last decades, but few basic
publications exist summarizing the current state of knowledge on ecologically relevant P …

Background and aims Biostimulants of natural origin represent a growing ecological strategy
to increase crops productivity, especially when applied in combination with microbial …

Chemical eustressors induce a eustress state “positive stress” increasing the resistance and
improve the plant growth. The potentiality of humic acids (HA) to act as a eustressor has …

Phosphorus (P) deficiency is a major constraint in highly weathered tropical soils. Although
phosphorous rock reserves may last for several hundred years, there exists an urgent need …