Allelopathy, which produces in plant and induced by allelochemicals, are secondarymetabolits and has an important place as a directly or indirectly. Generally, these compounds, whichare pruduced by roots in the plant which are belong to the same (autotoxicity) or different(heterotoxicity) species after succesor, has an effect that either may be reduce the growth anddevelopment or fully/completely able to stop. In this event, factors such as plant age, soil structure,genotype, humidity/water, ecology are very important. Particularly in terms of sustainability, there isa great place for the usage of various agricultural growing techniques such as crop rotation, stubbledfallow, mulched fallow, etc. If genotype, soil, ecology and growing techniques do not consider, levelof agricultural production is determined by plant nutrition, humidity/ water, temperature, stressfactors and which was released seed bed for the next one, especially, it is determined by allelopathiccompound(s) concentration it the plant root zone. Hence, due to excess of the humidity/water level in environment (for example The Black Sea Region), since the allelopathic interaction(s) decreases are being arisen in the produced crops ; but, particularly reducing at the humidity/water level always could be prevents the allelopathic originned negatives in every time and same the violence.