Correlation of standard germination test with field seedling emergence of hybrid maize (CV. Sc 704) in summer cropping

The research was conducted at the Safiabad Research Station and central laboratory of seed analysis at Karaj institute of seeds and seedlings registration، control and certification on 20 seed masses of single cross 704 corn hybrids (20 masses means; seeds of the same type but different vigourity) in 4 replicates. In the laboratory، the weight of the seeds was measured and the seed moisture content in the storage was determined. Then the standard germination test was performed according to ISTA rules and the relevant parameters (mean time to germination، mean daily germination، germination rate، germination rate according to Maguir formula and seedling vigor index) were measured. The data was analyzed based on the randomized complete block design. For the field experiments، after reaching the favorable climate conditions، seeds were planted in the field and the emergence of seed vigor index (percentage of seedling emergence، emergence rate and seedling emergence index) was measured and analyzed based on the randomized complete block design. Finally، the correlation between laboratory and field measurement were determined. Analysis of variance showed that among different seed masses، difference of the measured parameters were statistically significant and the comparison of the means showed that the mass imposes the highest viability of seed vigour on other indicators. The correlation between the measurements showed that the germination rate based on Maguir formula imparts significant positive correlation with seedling emergence in the field.