Kausalye, S.P.Gorde, Shubham Suresh2020-11-262020-11-262019-12-3119091https://krishikosh.egranth.ac.in/handle/1/5810155789An experiment was conducted on experimental farm of Sorghum Research Station,VasantraoNaikMarathwadaKrishiVidyapeeth, Parbhani, during summer2018-19entitled “Studies on Crop Weather Relationship in Summer Sorghum(Sorghum bicolor (L.) Moench)”to find out theoptimum sowing window for sorghum in summerseason to study the agro-meteorological indices of sorghum during summer season and to study the crop weather relationship in summer sorghum. The experiment was conducted in a split plot design with three replications.Treatments under study were four sowing dates in summerseasoni.e. D1 (1stMW), D2 (3rdMW) and D3(5th MW) as main plot treatmentsand four different genotypes PVK-801, SPH-1641, ParbhaniMoti and ParbhaniJyoti as sub plot treatmentswere sown with spacing 45x15 cm2.The grossplot size was 4.5 x 5m2and net plot size was 3.6 x 4.4 m2. The sowing of seed was done by dibbling method on respective date of sowing.The meteorological parameters (abiotic factor) play an important role in deciding the success or failure of the crop, because these factors strongly influence the physiological expression of genetic potential of the crops,hence, this study was undertaken. The results were obtained from the experiment and it was found that all the biometric observations(plant height, number of leaves, leaf area and dry matter) in summer sorghum were significantly the highest in sowing during D1 (01 MW) followed by second sowing date D2 (03 MW). Amongst the genotypes, the biometric observations (number of leaves, leaf area) were recorded significantly the highest in G1 (PVK-801).Sowing in D1(01 MW) significantly superior over the rest of the treatments with production of highest grain yield of 1631 kg ha-1followed by sowing in second sowing date D2 (03 MW)1092 kg ha-1and the lowest grain yield was observed in third sowing D3 (05MW).Hence, sowing of summersorghum should be completed on 01 MW or before 03MW; otherwise there is chance of reduction in grain yield with delayed sowing. Among the three dates of sowing, different meteorological indices GDD, HTU and PTU varied across different phenophases. Early sowing had favorable agro-climatic conditions particularly temperature, day length and sunshine hours in terms of required accumulation of GDD, HTU and PTU from sowing to harvest as compared to other dates of sowing. Total requirement of GDD, HTU and PTU showed increasing trend with extension of sowing time from D1 (01 MW) to D3 (05 MW). Correlation between weather parameter and growth stages of sorghum with grain yield showed that the weather parameters like, temperature, relative humidity and BSS having significant effect on critical growth stages.Diurnal temperature rangealso showed significant influence on grain yield and as the range increase with declined yields.EnglishThesis