Effects of alumumium on nutrient composition and yield of oats

Spotty chlorosis appeared on the young leaves of Al toxic plants and was severe or high Al level. Stems of the Al‐treated plants were purple While the roots were short, thick and brown in colour with little branching. The dry matter yield of tops and roots decreased with increased Al level. The concentration of P was greater in roots of Al toxic plants than in the control plants but a converse affect was recorded in tops. Increased rates of Al caused a decrease in the concentrations of P,K,Ca, Mc and Mn in plant tops, while Al concentration increased both in tops and roots. Iron content in tops affected with increased Al and in root a regular increase was observed. The results indicate that Al toxicity depressed the growth of oats, resulted in abnormal root development with tittle branching and affecting the utilization of several essential plant nutrients by oat plant.