Evaluation of the steady state porometers as crop stress detector in sugarcane by irrigation regimes and potassium fertilization

摘要

Field experiments were conducted with early maturing short duration Sugarcane cv. Co-8021 during 1993 (first plant cane) and 1993-94 (ratoon cane and second plant cane) at Tamil Nadu Agricultural University, Coimbatore to investigate the effect of Kapplication and irrigation regimes on plant water status parameters viz. transpiration rate and stomatal conductance and cane yield. The soil of the (first) experimental field was clay loam in texture, classified as fine montmorillonite isohyperthermicustropept. The soil was low in available N and high in available P and K. The same field-was maintained for the ratoon cane without disturbing the layout. The soil of the second experimental field (second plant cane) Was deep and sandy clay loam classified as Calcic - vertic ustropepts. It was low in available N, medium in available P and high in available K. Experiments were laid out in a split plot design, replicated thrice. Four irrigation regimes in the main plots were 0.75 IW/CPE ratio during tillering and grand growth period (I_1); 0.30 IW/CPE ratio during tillering and 0.75 IW/CPE ratio during grand growth period (I_2); 0.30 IW/CPE ratio during tillering and grand growth period (I_3); 0.75 IW/CPE ratio during tillering and 0.30 IW/CPE ratio during grand growth period (I_4).