Termed as plant conditioners or bioeffectors are substances, cultures of micro-organism, and mixtures of materials used to promote the growth of crop plants and can include natural or artificial plant growth regulators and biofertilizers They do not include pesticides or fertilizers. The concept has been developed on the basis of the idea that plants are not isolated entities but are grow within a complex ecosystem involving interactions with multiple organisms and that the strengths of these associations can be modified to enhance plant growth