Effect of High Doses of Arsenic in Soil on Phosphorus and Nitrogen Content in Bean and Tomato Plants

E. MITEVA
Plant Protection Institute, BG-2230 Kostinbrod, Bulgaria

Abstract

MITEVA, E., 2004. Effect of high doses of arsenic in soil on phosphorus and nitrogen content in bean and tomato plants. Bulg. J. Agric. Sci., 10: 599-602

The influence of some levels of arsenic in soil on phosphorus and nitrogen nutrition was investigated. The experiments were carried out in glasshouse conditions, during a two years of period. They were performed on young tomato plants of cv. "Ideal" and young green bean plants of cv. "Nikus" and "Black Starozagorski" The plants were cultivated in pots containing 1 kg soil each of them. An unpolluted soil characterized as an alluvial-delluvial soil. Arsenic in the form of As2O3 dissolved in distilled water was added to the soil in concentration 15, 25, 50, 75 and 100 mg.kg-1. The collected results of experiments of two years were analyzed using an analysis of variance.
The data showed that the enhanced doses of arsenic in soil provoke some changes in plant nutritive metabolism, including phosphorus and nitrogen uptake in bean and tomato plants. A decreasing of phosphorus and nitrogen content was observed in plants after treatment by 50, 75 and 100 mg.kg-1 As in soil. This high degree of depression could have contributed to the greater toxicity of arsenic. Bean plants of cv. "Nikus" were highly sensitive to all applied As doses.

Key words: arsenic, phosphorus, nitrogen, nutritive elements