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ISHS Acta Horticulturae 944: International Symposium on Vegetable Production, Quality and Process Standardization in Chain: a Worldwide Perspective

THE EFFECTS OF SEWAGE SLUDGE ON THE PLANT NUTRIENTS AND HEAVY METAL CONTENTS OF STRAWBERRY (FRAGARIA × ANANASSA DUCH) PLANT

Authors:   M. Kubilay Önal, B. Topcuoğlu
Keywords:   heavy metals, plant nutrients, sewage sludge, strawberry
Abstract:
A greenhouse experiment was conducted to determine the effects of urban sewage sludge that is applied to soil, on the plant nutrients and heavy metal contents in the fruits and the leaves in strawberry. In the repeated applications of sewage sludge, more mineral contents and heavy metal accumulation are determined both in the fruit and in the leaf. Strawberry plants were grown in pots containing different amounts of sewage sludge (corresponding to 0, 15, 30 and 60 t/ha, as dry weight basis). Sewage sludge applications have important effects on N, P, K, Ca, Mg, Fe, Zn, Mn, Cu, Pb, Ni, Cd and Cr contents in the leaf. It is observed that when the application level is increased, mineral contents and heavy metal accumulation are also increased. For the fruit; N, P, K, Mg, Fe, Zn, Cu, Pb, and Cd contents were increased importantly by increasing levels of sewage sludge application; Ca, Mn, Ni, and Cr contents have not shown an important change. The quantity of the accumulation in the leaf is more than in the fruit for all nutrients and heavy metals. The sewage sludge, applied to soil, affects the growth of the plant positively and high mineral contents are determined. Contrary to this, it is observed that when the levels of application are increased, heavy metal accumulation is also increased. As a result of the application of sewage sludge to greenhouse soil with progressive dose (amount), heavy metal accumulation, determined in the plant, makes it necessary to be careful about safely recycling of sewage sludge in agriculture.
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