Secondary macroelements like Ca and Mg, and micronutrients such as Fe, Mn, B, Mo, Cu and Zn, although they are so designated because they need to be absorbed in smaller amounts, are as essential for the plant as are the primary macronutrients (N, P and K) and play a key role in crop development:
- Calcium helps stabilise cell walls, making the tissues more resistant and controlling the permeability of cell membranes. Related to stress detection mechanisms and the activation of defence mechanisms.
- Magnesium is a mineral among the constituents of plant chlorophyll. It is actively involved in photosynthesis, aids in phosphate metabolism, plant respiration and the activation of numerous enzyme systems.
- Iron is a catalyst that helps the formation of chlorophyll and acts as an oxygen carrier, favouring the formation of certain respiratory enzyme systems.
- Manganese is an activator of enzyme systems and is essential for the synthesis of lignin, which strengthens the cell walls. It is also involved in photosynthesis and root development.
- Boron is essential for the germination of pollen grains and for pollen tube growth. It also plays a vital part in binding the polysaccharides which form the cell wall structure. In addition, it forms sugar/boron complexes associated with the transmission of sugar and is important in protein formation.
- Molybdenum is necessary for the formation of the enzyme nitrate reductase, which reduces nitrates to ammonia within the plant, and is necessary for the synthesis of certain amino acids, and to convert inorganic forms of phosphorous into organic ones within the plant.
- Copper is necessary to form chlorophyll in plants and catalyses various metabolic processes.
- Zinc is needed to produce chlorophyll and for the formation of carbohydrates. It is also a structural component of proteins and reinforces enzyme systems.
An insufficient or inadequate availability of macro and microelements can lead to deficiencies in the plant, causing the malfunction of metabolic processes and provoking different types of chlorosis due to the absence of chlorophyll synthesis. When chlorophyll is not properly synthesised, photosynthesis does not take place, and this can result in reduced crop yield.
To ensure the assimilation of all the necessary nutrients, Meristem offers a wide range of correctors of deficiencies.