Journal of Agronomy1812-53791812-5417Asian Network for Scientific Information10.3923/ja.2006.126.130GulluogluLeyla AriogluHalis ArslanMehmet 1200651A two-year study was conducted to determine the effects of some Plant Growth Regulators (PGRs) and nutrient complexes on biomass weight, seed yield and yield components of both main and double cropped soybean grown under hot and dry conditions. The experimental design was Randomized Complete Block with four replications. Atonik, Biomaster, GA3, Kinetic, Maxicrop, Cytozyme and Megahix were used as plant growth regulators. The soybean cultivar was A3935 (MG III). Application of PGRs had different effects on biomass weight, seed yield and yield components of both main and double cropped soybean. The highest biomass weight (1054.0 g-2) was obtained from Maxicrop and the lowest (891.8 g-2) was obtained from Megahix applied plots in main cropped soybean. Under double crop conditions, however, the highest biomass weight (857.6 g-2) was obtained from Cytozyme and the lowest (780.0 g-2) was obtained from control. Application of PGRs increased the seed yield and yield components of soybean under both main and double cropped conditions. The highest seed yield was obtained from Atonik with 3876 kg ha-1 for main crop soybean and 47 kg ha-1 for double cropped soybean. The lowest seed yields were obtained from no chemical applied control plots of both main and double cropped soybean with 3386 and 838 kg ha-1, respectively. Application of Atonik, Cytozyme and Maxicrop could be suggested to alleviate heat stress and increase seed yield of both main and double cropped soybean grown under hot and dry conditions.]]>Arioglu, H.H. and N. Oler,19893cytozyme pix and atonic applications effect on seed yield and some agronomic characteristics in double croped soybean production.]]>1989pp: 398493Khatib, K.A. and G.M. Paulsen,199939119125Boerma, H.R. and A.S. Ashley,198274995998Board, J.E. and B.G. Harville,199688772777Board, J.E., M.S. Kang and B.G. Harville,199991128135Ball, R.A., L.C. Purcell and E.D. Vories,20004010701078Calvino, P.A., V.O. Sadras and F.H. Andrade,200319265275Dashora, L.D. and P.M. Jain,199481235237Egli, D.B. and Y. Zhen-Wen,199131439442Egli, D.B., R.D. Guffy and J.J. Heitholt,1987159176185Egli, D.B. and W.P. Bruening,1992621929Egli, D.B. and W.P. Bruening,200092532537Fehr, W.R. and C.E. Caviness,1977Kwon, E.O. and J.O. Guh,1987Glycine max (L.) merril).]]>32392402Kamal, M., H. Takahashi, H. Mikoshiba and Y. Ota,199539184189Kane, M.V., C.C. Steele and L.J. Grabau,199784769773Marking, S.,1986Sapra, V.T. and A.O. Anaele,199116796102SAS,1996Shukla, K.C., O.P. Singh and R.K. Samaiya,199713213215Tanner, J.W. and D.J. Hume,19781978pp: 157-217pp: 157-217Whigham, D.K. and H.C. Minor,19781978pp: 249pp: 249Wesley, R.,19991999pp: 143-156pp: 143-156