The effectiveness of Pepton? replacing chelates in citrus production

Line of biostimulants with highly bioavailable iron

Iron is an essential nutrient for plants as it is a key component of several proteins and enzymes, including chlorophyll. The mechanism of action of iron in plants is complex and is related to its ability to act as a cofactor for several enzymatic reactions. Iron is required for chlorophyll production and in the synthesis of proteins and enzymes participating in respiration, DNA synthesis and defence against abiotic stress.

Plants have evolved iron uptake mechanisms, including the reduction of ferric iron (Fe3+) to ferrous iron (Fe2+) in the rhizosphere, which increases the solubility of iron in the soil and its uptake by the roots. Iron is absorbed by the plant roots in the form of iron ions and transported through the xylem to the leaves and other plant tissues. For uptake, iron must be in soluble form, which can be a challenge in some soils, especially in calcareous soils with an alkaline pH.

Citrus require an adequate amount of iron to produce good quality fruit and maintain optimal tree health. The amount of iron required varies depending on the citrus variety, soil conditions and other environmental factors. However, in general, the level of iron in soil recommended for citrus crops should range between 2 and 6 ppm (parts per million). In the Mediterranean basin, the usual doses of iron chelate for citrus are usually in the range of 50-100 g per tree.

Lack of iron in the soil can result in a condition known as iron chlorosis, which is characterised by yellow leaves with green veins. This can reduce fruit production and affect citrus quality. It is therefore important to ensure that citrus crops have access to an adequate amount of iron in the soil. This can be achieved by applying iron-containing fertilisers, as well as by improving soil quality through appropriate management practices such as crop rotation and adding organic matter to the soil.

Iron chelate is usually applied by drip irrigation, as this ensures a uniform distribution of the nutrient in the soil and its uptake by the tree roots. The frequency of application will depend on the iron demand of the tree and the capacity of the soil to retain the nutrient.

Read the full article in English on APC Agro website:

Or in Spanish in the journal PHYTOMA :