Abstract
Organic farming is an alternative to the striking increase in the use of synthetic fertilizers and pesticides, and become necessary to maintain long term high productivity of crops and sustainable agriculture. However, crop demand and nutrient bioavailability (N and P) has been major yield-limiting factor in many organic farming systems. The use of bioeffectors, formally known as biostimulants is loosely defined as an organic material and/or microorganism that is applied to enhance plant resilience, and also to improve nutrient uptake, stimulate growth and increase stress tolerance or crop quality. They can be composed of microorganism, protein hydrolysates, seaweed extracts, humic acids, and other substances. Bacteria, fungi and yeasts are used in biocontrol of plant pathogens, and produces hormone like substances. By using such stimulants, impact of environmental stresses caused by edaphic or other factors are also reduced. This review focuses on how the microbial biostimulants application can overcome nutrient limitation in organic systems by reducing gap between organic and conventional yields.
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