Correlation between seed tests and field emergence of two maize hybrids (SC704 and SC500).

Early emergence and stand establishment of maize (Zea mays L.) are considered to be the most important yield-contributing factors. The influence of seed vigor on these factors is vital. Therefore, five laboratory tests and field experiment were conducted on basis of a randomized complete block design (RCBD) with five replications in 2011, to evaluate the correlation among the seed vigor tests and field emergence of two maize hybrids (SC704 and SC500). In laboratory tests, differences between two hybrids for cold test and electrical conductivity test were significant (P≤0.01). The leachates of hybrid SC500 was 35% higher than the leachates of hybrid SC704. However, high germination percentage was obtained by hybrid SC740 in cold test. A Statistically significant difference was found between hybrids in field emergence percentage (P≤0.05). The field emergence of hybrid SC704 and hybrid SC500 was 71% and 37%, respectively. The farm emergence percentage had the significant negative correlation (-0.71) with conductivity test, but positive correlation (0.79) with cold test. No significant correlation between the standard seed germination and the field emergence was detected. Therefore, the standard germination test was not a good indicator for field emergence percentage. However, cold and conductivity tests were the best predictor of field emergence than all the other laboratory tests.

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