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Introduction Excessive use of products of chemical synthesis for pest and disease control in agricultural crops has caused damage to the environment and health; furthermore, it has promoted resistance in pests, for which reason...

Amino acids are basic units for protein biosynthesis, other than being precursors of other molecules which are essential for plant metabolism, such as hormones, coenzymes, nucleotides and polymers of the cell wall. These are...

Humic substances The soil contains large quantities of organic matter from decaying animals and plants. Organic vegetable and animal residues, managed or deposited in different environments or on the soil, undergo a microbial transformationprocess...