Relations between Nutrient and "Kareure-Phenomenon" of Naked Barley Plants

So-called "Kareure-phenomenon of barley" is characterized by the following symptoms; ears change in white colour and are forced to die prematurely soon after heading time, increasing the number of the affected ears with maturation. The phenomenon appears under the conditions of (1) defficiency in magnesium and potassium, or (2) defficiency in magnesium and excess of nitrogen in relation to potassium, during the period following spike initiation. Side by side with these nutritional predispositions, high air temperature accompanied with strong sunshine during the later period of plant growth is indispensable to the occurrence of the phenomenon. Soon after heading, preceeding to the occurrence of the above-mentioned typical phenomenon, the following symptoms can be observed: roots are changed brown, and within the tissue of stele and vessels of roots some yellowish brown substances deposit and in some cases, abnormal and sudden wilting of the flag leaf, or the second leaf takes place.