AbstractThe influence of the growth retardants 3‐chlorobenzyl‐tri‐n‐butylammonium bromide (B3), 4‐chlorobenzyl‐tri‐n‐butylammonium bromide (B4), α‐naphthylmethyl‐tri‐n‐butylammonium bromide (α‐NMB) and the commercial products 2‐chloroethyltrimethylammonium chloride (chlormequat chloride) andN‐dimethylaminosuccinamic acid (aminozide) on the growth characteristics and chemical composition of plants growing in soil under glasshouse conditions has been studied. The height, fresh and dry weights and content of nitrogen, phosphorus, potassium, calcium, magnesium, iron and manganese of treated plants were compared with those of control plants. The chlorophyll content of certain leaves was also estimated.The retardants markedly altered the growth habit of plants and usually led to a decrease in fresh and dry weights. The percentage of plant nutrient elements in the dry ma
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