Magnesium deficiency 157883 220477360 2008-06-20T01:32:59Z Earthdirt 3512837 add cat and nav box {{otheruses4|magnesium deficiency in plants|the same nutritional deficiency in humans (ICD10 code E61.2)|magnesium deficiency (medicine)}} '''Magnesium (Mg) deficiency''' is a plant disorder with two main causes. [[Magnesium]] can be easily washed out of light [[soil]]s in wet seasons or excessive [[potassium]] fertiliser usage can cause also Mg to become unavailable to the growing plant. This disorder particularly affects [[potato]]es, [[tomato]]es, [[Apple (fruit)|apple]]s, [[Ribes|currant]]s and [[Gooseberry|gooseberries]], and [[chrysanthemum]]s. Symptoms include, yellowing between leaf veins, which stay green, giving a marbled appearance. This begins with older leaves and spreads to younger growth. Can be confused with [[virus]], or natural aging in the case of tomato plants. [[Fruit]]s are small and woody. Mg deficiency can be rectified in the short term by applying a [[foliar feed]] fortnightly, with [[epsom salt]]s diluted at a rate of 200g per 10 litres of water (8oz per 2½ gal). In the longer term add [[dolomitic limestone]] if [[soil pH]] allows, or other Mg containing rocks such as [[Kieserite]]. Reduce usage of [[potash]] fertilisers if this may be contributing to the problem. {{PlantMineralDeficiency}} [[Category:Physiological plant disorders]] {{plant-disease-stub}}