The purpose of the present work was to study lhe direct and residual
effects of phosphatic fertilizer on vigor of peanuts seeds, from plants that didn't
respond to phosphatic fertilization, under field conditions. The doses employed
were: 0, 40, 80, 120 and 160kg/ha of P2O5, as simple superphosphate, that were
applied in the sowing furrows at the wet season. To study the residual effect of
those doses on seed, another experiment was carried out in the some location at
the dry season. The peanut cultivar employed was 'Tatu vermelho' (Arachis
hypogaea subspecies fastigiata var. fastigiata). The pods of the two experiments,
harvested at 01/16/76 and 06/15/76, were shelled mechanically. The seeds were
treated with mercurial fungicide, packed in polietilene bags and stored under
laboratory conditions by 12 months. In each experiment, at 3, 6, 9 and 12 months
after storage, samples of seeds were taken and speed and percentages of
seedling emergence were studied under field conditions. Phosphatic fertilizer didn't
affect seed vigor, considering all the storage periods; however seeds obtained from
treatments that received 120 and 160kg/ha of P2O5, at the wet season, presented a
higher percentage of emergence than the treatment that dind't receive fertilization,
when tested after 9 months of storage. Seed vigor in both experiments decreased
with the storage period.