Abstract: A plant metabolism promoting composition for promoting metabolic processes in plants includes an L-amino acid, or a salt or a derivative thereof, having a chemical formula of HO2CCH(NH2)CH2CH2CONHR, wherein R is an alkyl or an alkenyl. An amount of the composition applied to one or both of a seed and a plant is sufficient to augment one or more of: i. growth of a plant growing from the seed or growth of the plant, ii. health of a plant growing from the seed or health of the plant, iii. quality of yield from a plant growing from the seed or quality of yield from the plant, and iv. quantity of yield from a plant growing from the seed or quantity of yield from the plant.

Abstract: A urea cycle augmenting composition for improving plant growth and yields and quality of crops includes a urea cycle augmenting composition, which comprises two or more of L-arginine, L-ornithine, L-aspartic acid, L-citrulline, L-argininosuccinic acid, and agmatine, or salts or derivatives thereof. An amount of the composition applied to a seed or a plant is sufficient to augment the urea cycle of a plant growing from the seed or the plant.