Examination of Novel and Existing Seed Treatments on Emergence, Vigor and Subsequent Life History Traits in Different Peanut Maturity Groups


University of Florida

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Southeast (GA, FL, AL)

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As illustrated by the FIELD maturity levels of all four genotypes (Table 2), growers do not always optimize the harvest date of peanut. The CLEANER was shown to increase the percentage of mature pods by removing immature pods, improving some genotypes more than others. This is best shown by comparing the significant rise in pod maturity for TUFRunner™ '727' after the CLEANER to the constant rate for TUFRunner™ '511'. This study revealed that seed maturity is indeed linked with in-shell pod size. The biggest pods associated with the LARGE stage after in-shell sizing had the highest proportion of mature pods of all three stages, and was near or over 70% for each genotype despite the much lower maturity proportion associated with each at the FIELD stage. The SMALL basket was found to be relatively immature, and NUBS extremely immature for certain genotypes. Grade was determined to not be an accurate gauge of maturity, as both the mature and immature seed graded similarly across stages. 
Based on the results of this study, it is recommended that seed be sized in-shell and seed be collected for future plantings from the LARGE stage. This is an alternative to the current process whereby seed are taken from a collection of jumbo or medium sized seed which includes seed from the more immature SMALL and NUB baskets. Because the LARGE basket increases the level of pod maturity viewed at the FIELD stage, it can be used to offset lots harvested prematurely by growers such as TUFRunner™ '727' when selecting for seed. Continued research into the link between seed size and grade needs to be pursued, as this study found grade to not always be an accurate representation of maturity. 

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