Abstract
ABSTRACT Extract of nettles (Unica dioica) was evaluated for potential growth stimulating effects on wheat, tomato and barley. Approximately 10× dilution of nettle water gave the highest root fresh weight and adventitious root length in wheat in relation to more dilute or concentrated media. Plants of barley and tomato were grown in sand and a peat-sand mixture supplied with dilute nettle water or a nutrient solution with the same mineral composition. Use of nettle water resulted in about 20% higher shoot fresh weight and about 15% higher nitrogen levels in shoots compared with the nutrient solution treatment. Chlorophyll levels were also higher with the nettle water treatment. Soil respiration was approximately doubled in pots treated with nettle water compared with those receiving nutrient solution. Nettle water increased pH in the substrate by one to two units. No significant difference in growth effects was observed from use of fresh or dry nettles. Nettle water made from spring nettles usually gave h...
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