Efficiency of utilization of a drought index in evaluation of adaptability to drought of corn hybrids (Zea mays L.) in early testing stages
Published in Scientific Papers. Series A. Agronomy, Vol. LV-2012
Written by Valentin MANDACHE, Ion CIOCAZANU, Gabriela VALSAN, Viorel DINCĂ
Evaluation of drought tolerance is a complex and relatively difficult process. Two main approaches were considered by scientist for drought tolerance estimation: (i) testing in water managed locations and (ii) testing in large corn testing network, in targeted environments and managed irrigation – full and limited. A large volume of field data and other related traits could be generated in this type of approach , but usually for drought evaluation purpose two data breakouts were examined: full irrigated (non-stressed) and limited irrigated (water stressed). Selection of the hybrids is done for dual performance, for reaching a balance between a reasonable performance in drought conditions and a good response to favourable water regime. Usually a regression chart between performance in limited irrigation and full irrigation (non-stressed) is used to select hybrids. A new selection drought index (DRIND) is proposed. Application of DRIND on experimental data obtained in 2011 in East European Pioneer corn yield test network showed good efficiency in selecting the most adapted (drought tolerant) corn hybrids.