Advanced yield potential test on synthetic genotype of maize tolerant to drought and low nitrogen

Abstract

Increased productivity of maize with intensification can be achieved through the release of tolerant varieties to drought and or low nitrogen conditions while supporting extensification to marginal land. During 2013-2015, previous studies had obtained three candidates of maize new superior varieties (NSV) tolerant to drought and low nitrogen (N) (Syn2-4, Syn2-8, and Syn2-16); and six varieties tolerant to drought or low N (Syn2-1, Syn2-2, Syn2-4, Syn2-8, Syn2-15, and Syn2-16). The potential yield of these genotypes under drought or low N conditions was 6.5 t Ha-1. To examine the potential yield of these 6 genotypes, advanced test was conducted using three maize varieties (Lamuru, Sukmaraga and Bisma) as comparison. The results show that the genotypes of synthetic maize which gave the highest and better yield potential compared to the three comparators varieties of Lamuru, Sukmaraga and Bisma were Syn2-4 (8.13 t Ha-1), Syn2-15 (8.21 t Ha-1), and Syn2-16 (9.23 t Ha-1). While the other three genotypes only gave higher yields than the varieties of Bisma and Lamuru with potential yield of Syn2-1, Syn2-2 and Syn2-8 were 6.74, 7.06 and 7.78 t Ha-1, respectively. Increased production was more dominant due to the difference in the number of cob at harvest and weight of 1000 seeds.

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