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UBC Theses and Dissertations

Effects of aldrin, isodrin, dieldrin and endrin on germination, growth and chemical eonstituents of some horticultural crop plants Unrau, Abraham Martin

Abstract

Soil was treated with Aldrin, Isodrin, Dieldrin and Endrin respectively and a number of horticultural crop plants planted in it and the effects were observed and recorded. Yield increases were obtained with potatoes and carrots under field conditions, the maximum yield being found at the rate of 6.5 lbs. per acre of each compound used. Growth rates of tomato plants appeared to be slightly stimulated by all the compounds. With radish, on the other hand, Aldrin and Isodrin depressed foiliar growth while Dieldrin and Endrin favoured top growth; this was reflected in top-root ratios. Dieldrin and Endrin had a definite stimulatory effect on germination of radish seeds grown on treated agar. Maximum stimulation was obtained with Dieldrin and Endrin at 40-200 p.p.m., with Isodrin at 40 p.p.m. and Aldrin at 10 p.p.m. Soil applications of the compounds appeared only slightly to stimulate radish seed germination while tomato seeds were unaffected. A general depression of sugar content was noted in all crops with all compounds while Vitamin C content of radish was significantly depressed. Aldrin and Isodrin greatly depressed the nitrogen content of radish tops and roots while phosphorus was depressed greatly in the foliage. Dieldrin and Endrin increased nitrogen in radish foliage and roots and had little effect on the phosphorus content. Aldrin and Dieldrin greatly increased the chlorine content of potatoes but did not affect the dry matter content. Endrin and Isodrin had little effect on the chlorine content of carrots.

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