High temperature during the crop growing period is detrimental as it results in reduction of yield. A diverse set of rice germplasm consisting of 60 genotypes was grown at two different sowing times (normal and late) and were exposed naturally to high temperature in the late sown condition (stress). There was a severe reduction in grain yield and spikelet fertility in all the genotypes in the late sown crop. Yield based indices were computed based on grain yield recorded under normal and stress conditions. Indices Stress Susceptibility Index (STI), Geometric Mean Production (GMP), Mean Production (MP), Yield Index (YI), Modified stress tolerance (K1STI and K2STI) were positively correlated with yield recorded under both normal and high temperature stress condition and can be considered as suitable indices for screening of rice genotypes under high temperature conditions. Ranking genotypes based on the indices revealed that Rasi, HKR47, IR64, Khudaridhan, Akshayadhan and N22 exhibited the highest mean rank and hence they can be identified as heat-tolerant genotypes. ADT43, Vandana, IR36, MTU1001, ADT49 and Krishnahamsa had a lower rank and were identified as susceptible genotypes to high-temperature stress.

An experiment was under taken at the Agricultural College farm, Bapatla during two consecutive years of rabi 2016-17 and 2017-18. The crop growth stages of maize are dependent on various morphological, anatomical and physiological parameters. The experiment was laid out in randomized block design with six maize hybrids viz., 900M Gold, DKC 9142, DKC 9120, DKC 9081, DKC 9042 and Pinnacle in four replications. CGR and NAR was found to be the highest at 57 to 63 DAS among all the hybrids during both the seasons where CGR was found to be the highest DKC 9142 followed by Pinnacle which were at par with each other. Whereas, pinnacle recorded highest NAR followed by DKC 9142. Among all the hybrids, RGR was found to be maximum at 50 to 56 DAS coinciding with reproductive primordial development. The yield and yield attributing characters such as length of the cob, number of rows per cob, number of kernels per row, 100 seed weight and the total kernel yield showed significant variation among the hybrids where the highest yield was obtained in pinnacle (9641.41 kg ha -1 ) and DKC 9142 (9243.9 kg ha -1 ).