Effects of zinc supply on its uptake, growth and biochemical constituents in lentil

The effects of five levels of Zn, viz. 0.0, 0.25, 1.0, 25.0 and 100.0 ppm on growth, yield, biochemical changes and its uptake in lentil (Lens culinaris Medic) plants, grown in loamy-sand alluvial soil were examined. Soil used in the experiment was highly deficient in Zn (0.46 ppm). The maximum increase of 20.5% and 52.7% in the height and dry matter was obtained at 25 ppm Zn supply. Protein and chlorophyll a content were also significantly increased by 25 ppm Zn. Excess Zn of 100 ppm however, reduced all the growth and biochemical responses. Zn-toxicity symptoms, viz. stunted plant growth and chlorosis followed by necrosis in lentil leaves were observed. The uptake of Zn was found to be dose dependent. Accumulation of Zn was more in root than the shoot at all Zn applications.