Studies of foliar application of thio urea on morpho physiological biochemical and yield parameters of wheat varieties under terminal heat conditions

Abstract

The present investigation entitled Studies of foliar application of thio-urea on morpho-physiological, biochemical and yield parameters of wheat [ Triticum aestivum L.] varieties under terminal heat conditions was conducted at Student Instructional Farm of CSUAandT Kanpur, during Rabi 2017-18 and 2018-19. It was designed in double-split plot design with three replications. The objective of investigation was to study the effect on foliar application of thio-urea with different doses on plant traits (morphological, physiological, biochemical and yield parameters) of two wheat varieties under timely and late sown condition. The two conditions i.e., timely (D1) and late (D2) conditions were allocated in the main plots and two wheat varieties i.e., V1 (K-402) and V2 (K-607) in sub plot and for each five chemical treatments were applied as foliar spray at heading stages by 500ppm (T1), 750ppm (T2), 1000ppm (T3) and 1500ppm (T4) thio-urea, along with control (T0) in sub-sub plots. Results revealed that growth in terms of plant height, productive tiller, dry matter production, morphological parameters, physiological and yield and its components varied significantly among tested wheat genotypes during both years of study timely and under late sown conditions. The significantly higher grain yield (6.7 and 6.9 g) with morphological newlinetraits (Plant height, Productive tiller, Dry matter production, Days to flowering, Days to anthesis, Days to maturity), physiological traits (chlorophyll content (SPAD), temperature depression (CTD), Relative water content, biochemical traits (Protein content, Fat content), Yield and yield traits biomass plant-1, Main spike length (cm), 1000 grain weight (g), harvest index (%) can be obtained by foliar application of 750ppm thio-urea (T2) with both conditions of i.e., timely (D1) and late (D2) of wheat crop. In this parameter represents thiourea doses 500ppm newline