Department of Botany, Lucknow University, Lucknow
The relation of E.S.P. to macro-and micronutrient element composition of paddy plants grown on Usar soils is described. There was a positive correlation between E.S.P. of the soil and water soluble and exchangeable Na and water soluble P and a negative one between E.S.P. and water soluble and exch. Ca and Mg, ammonium acetate extractable Fe and Mn, perchloric-sulphuric acid digestible Zn and soil nitrogen. The plants grown on high E.S.P. soil showed a poor growth and contained a high tissue concentration of Na, Mg, Fe and B and low amounts of K, Ca, P, N, Mn and Cu. Significant positive correlation was found between tissue Na, Ca, P, Cu and N, and water sol or exch. Na, water sol. Ca, NaHCO3 extractable P, HClO4-H2SO4 digestible Cu and nitrogen content of soils respectively. No relation was, however, observed between tissue K, Ca, Mg, P and S, and water sol. or exch. K, exch. Ca, water sol. or exch. Mg, water sol. or exch. P and water soluble, exch. or Morgan's extract sol S of soils respectively. Similarly the Fe, Mn, Cu, Mo and B in plant tissue did not show any correlation respectively with water sol. or ammon. acetate (pH 3.0) extractable Fe, water sol. Mn, water sol. Cu, water sol. or ammon. oxalate extractable Mo and 1:2 soil to water extractable B contents of soils.
