Author(s):

Vadlamudi Dinesh Rahul, Rajendra Kumar Panda, Devraj Lenka and GR Rout

Abstract: A field experiment was conducted on maize (Zea mays) at EB-II section of the Department of Plant Breeding and Genetics, College of Agriculture, OUAT, Bhubaneswar. The twelve germplasm lines along with 3 hybrid checks were evaluated under drought conditions. The plant dry weights were recorded from 45 Days after sowing with 10 days interval till harvest and using that data RGR, CGR, NAR and LAI were calculated and illustrated in the form of graphs. The present research emphasises on the growth of the maize hybrid germplasm lines under receding soil moisture condition and a significant variation was observed regarding all the growth parameters at all the growth stages. LAI ranges from 2.60 (NK6204 at 60DAS) to 5.39 (Z630-2 at 75 DAS). CGR ranges from -1.32 (Z638-2 at 90 DAS) to 11.41 (PIO3396 at 75 DAS). RGR ranges from 5.08 (Z638-3 at 90 DAS) to 5.67 (Z638-1 at 90 DAS). NAR ranges from -0.28 (Z638-2 at 90 DAS) to 2.91 (900MGold at 75 DAS). There were some reports that LAI reduction as a drought mitigating strategy the germplasm lines with lower LAI show tolerance towards drought as in case of the three check hybrids, Z638-3 and Z637-1 germplasm lines. The reduced Stover yield and grain yields in all the germplasm lines and the three hybrid checks were due to the drought stress imposed from 45 DAS to 75 DAS. The germplasm line Z635-3 (2.65 t ha^-1) is considered to be drought-tolerant among the 12 germplasm lines because of its yield potential under drought conditions.

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