Before revision: Biostimulants sometimes also termed as plant conditioners are substances and mixtures of materials used to promote the growth of crop plants and can include natural or artificial plant growth regulators and biofertilizers.
After revision: Biostimulants sometimes also 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.