engleski

Influence of hydroameliorated soil on chlortoluron leaching and yield of winter wheat

Winter wheat is the leading culture according to sow area in Croatia. Herbicide products based on chlortoluron are most widely used because of their inhibition of photosynthesis that provides pre- and post-emergence control of many annual and perennial weeds. Therefore the aim of this study was to determine the concentration and leaching of chlortoluron in drainage water on pipe drainage spacing from 20 m. The study was conducted on reclamation test field, on hydroameliorated Gleyic Podzoluvisol during three years. Chlortoluron extracted from the samples of drainage waters was determinated by gas chromatography. Data were statistically processed by means of analysis of variance. The concentration of the chlortoluron recorded in drainage waters varied in a wide range, with maximum values recorded soon after its application and at the start of higher drainage discharge. The results indicate that maximal concentration of chlortoluron in drainage water exceeded the maximum allowable concentration (MAC) for single herbicides in drinking water (100 ng l-1) in the larger part of the year and there were statistically significant differences between the quantity of chlortoluron leached in tested years, as well as quantity of yield winter wheat in tested years. There are very high coefficient of correlation between the sum of annual precipitation and drainage discharge (r=0.981), as well as drainage discharge and leached of chlortoluron (r=0.977).

hydroameliorated soil; chlortoluron leaching; winter wheat yield

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