Chapter 18

Effects of Humic Materials on Plant Metabolism and Agricultural Productivity

Andrés Calderín García, Fernando Guridi Izquierdo and Ricardo Luis Louro Berbara

Humic materials, such as compost or vermicompost, have a high potential for increasing plant production, even in unfavorable environmental conditions. The use of these materials involves two types of action: direct (on plant metabolism) and indirect (increased soil fertility). The materials are composed of mineral elements, plant hormones, and amino acids that create beneficial conditions for crop yield and anti-stress adaptation. These products increase soil mineral content, reduce compaction, increase water retention and aggregate stability, and provide an adequate niche in ...

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