Study on Association of Spad Chlorophyll Meter Reading (SCMR), Photosynthesis and Transpiration Rate with Grain Yield in Sorghum Genotypes Under Post Flowering Moisture Stress Conditions.

A field experiment was conducted during rabi 2012-13 at research farm of Directorate of Sorghum Research, Rajendranagar, Hyderabad. The experiment was laid out in a split plot design, replicated thrice, with 10 Sorghum genotypes as main treatment (well watered and water stress conditions) and with 10 genotypes are sub treatments CRS 4, CRS 19, CRS 20, PEC 17, CSV 18, M 35-1, Phule chitra, Phule moulee, EP 57 and CRS 1). Photosynthetic rate and stomatal resistance at 15 and 30 DAF were positively and significantly correlated with grain yield while the transpiration rate at 15 and 30 DAF exhibited negative correlation with grain yield. SPAD chlorophyll meter reading (15 and 30 DAF) and chlorophyll content at 30 DAF had positively significant correlation with grain yield.

Studies on genetic variability, heritability, correlation and path analysis in maize (Zea Mays L.) over locations.

The present investigation was carried out to study the heritability, correlation and path coefficient analysis in 45 hybrids and ten parents. In pooled analysis of variability parameters revealed that the phenotypic coefficients of variation (PCV) were higher than genotypic coefficient of variation for all the characters studied indicating the role of experimental variance to the total variance. The magnitude of PCV and GCV was high for grain yield per plant followed by ear height, number of kernels per row, 100-seed weight, ear length, plant height, ear girth and number of kernel rows per ear. High heritability coupled with high genetic advance as percentage of mean was observed for ear height, grain yield per plant, plant height, number of kernels per row and ear length. In general, magnitudes of genotypic correlations were found to be higher than phenotypic correlations. The results indicated that grain yield was positively and significantly associated with 100-seed weight, ear girth, ear length, number of kernels per row, plant height, number of kernel row per ear and ear height. Days to 50 percent tasseling had largest direct effect on grain yield per plant followed by 100-seed weight, ear length, days to maturity, ear height, number of kernels per row, ear height, number of kernel rows per and plant height.