In the last few years, more and more fruit farmers and growers of both wine and table grapes report frequent internerval chlorosis of the younger leaves, which subsequently result in necrotic spots with early leaf drops and bring to progressive qualitative and quantitative production losses.
Research studies on this symptomatology unequivocally confirm that this is due to varying degrees of Manganese deficiencies.
Manganese is an essential microelementfor crops (more_info_manganese), since it is part of several enzymes and coenzymes, which regulate fundamental processes in the plant, such as the synthesis of chlorophyll.
In addition, it is important in the processes of fermentation of the grapes, since it contributes to the improvement of the wine bouquet, a very well-known aspect of wine for enologists.
The causes for such serious and always more frequent manganese deficiencies in grapes, pome and stone fruits should be linked to:
- The progressive reduction of the use of agrochemicals, whose active principles contain manganese (such as Mancozeb, for instance), which cause a lack of constant supply of this element.
- The progressive loss of organic matter in several soils.
- Climate change, which reduces the root absorption of this element, due to the rise in temperatures and to the reduction of rainfalls. As a consequence, a fractioned supply of the element is needed, rather than the largely more effective supply in one solution.
- The use of selective rootstock for manganese N
We suggest Carrier Mn, a liquid formulation containing Manganese (Mn 8% p/p), entirely complexed with ALS (ammonium lignosulphonate). The ALS used by Green Has Italia is a complexing agent of vegetal origin. It is totally biodegradable, deriving from multiple lignin sources, mixed together by GHI according to specific ratios that guarantee maximum bioavailability and stability of manganese, even in association with the most common agrochemicals, without altering their efficacy.
Carrier Mn provides also significant quantities of Zulphur and organic Carbon, which increase the energetic metabolism of the plant.
In order to prevent deficiencies and react to the physiological needs of the crops, we suggest a fractioned and constant administration of the product, starting from the first phytosanitary intervention with a dosage of 50ml/hl in parasiticide mixtures.
In order to cure clear deficiencies of the element in a quicker and more efficient way, we suggest intervening with a dosage between 1 and 2 l/ha for each treatment, according to the species, the age of the plant and to the plant density.