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1 Polish Journal of Ecology

1 2005

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Urease activity and ATP content in soil and plant related to copper concentration

Śnieg B., Nowak J.

Polish Journal of Ecology

2005

Vol. 53, nr 1

105-111

This study aimed at the assessment of the influence of various Cu(NO3)2 doses added to soil on Cu content in soil and on its influence on the activity of urease and ATP content in soil and in plants of various growth stages. A two-factor pot experiment had been started in 2002 using as test plant - the pea (Pisum sativum L.). Soil was taken from 0-30 cm layer of an arable field (light silt loam, 1.2% C content, and neutral reaction). Four doses of copper (II) nitrate (V) as Cu(NO3)2 ·3H2O were applied (each in 4 replications) following: I - control (no salt), II - 0.05 mmol · kg-1 soil, III - 0.50 mmol kg-1 and IV - 5.00 mmol · kg-1 soil. According to six degrees classification of soil contamination by copper, application of 0.05 mmol of copper up to high level of natural content in soil (but still 0° of contamination), after application of 0.5 mmol·kg-1 - copper content increased to 1° of contamination, 5.00 mmol kg-1 Cu+2 dose caused high pollution (4° of contamination). Each pot was filled with 2 kg of the treated soil and 5 pea seeds were planted per pot. The experiment lasted 56 days. Soil moisture was maintained during the experiment at 60% water holding capacity. In the course of the experiment the following growth stages were noted: 2 pairs of leaves stage (day 14th), flowering stage (day 44th), mature stage (day 56th). At those times soil and plant samples were taken to assess copper content in soil (content of total and 1M HCl soluble Cu), urease activity and ATP levels. A high positive correlation was found between Cu content (total and 1M HCl soluble) in soil and in plants. High Cu content in soil (4° of contamination . high pollution) caused a decrease of urease activity and ATP content in soil. Elevated Cu content in plant caused a distinct inhibition of urease activity in all the analyzed growth stages, and markedly higher content of ATP at the stage of flowering and mature stage of Pisum sativum L.