PAPER TITLE :EFFECT OF SOWING DEPTHS ON THE GERMINATION AND EARLY GROWTH OF DIFFERENT SEED-SIZE CLASSES OF ARTOCARPUS HETEROPHYLLUS LAM.

APPLIED TROPICAL AGRICULTURE | VOLUME 23 NUMBER 2 2018

Paper Details

  • Author(s) : Chima, U.D., *Fredrick, C. and Ndubuokwu C.H.
  • Abstract:

Information on the effect of sowing depth on the germination and early growth of different seed sizes of A.
heterophyllus has not been documented. Therefore, this study examined the effect of sowing depths on the
germination and early growth of different seed sizes of A. heterophyllus. It specifically evaluated the effect of
differents owing depths on the emergence, duration of emergence, germination percentage, total height, number of
leaves, collar diameter, seedling biomass and moisture content of three seed size classes of A. heterophyllus. Viable
seeds of A. heterophyllus were obtained from a single mother tree and separated into three seed size classes using
their diameters. The diameter classes are small (0.90-1.26 cm), medium (1.30-1.55 cm) and large (1.60 -1.80 cm).
The seed diameter varied significantly (p ≤ 0.05) among the three size classes. The experiment was laid out in a
Completely Randomized Design (CRD). Seeds from each seed-size class were sown at three depths (2, 4 and 6 cm)
with ten replicates for each of the sowing depths. The results of the study showed that emergence started from 2cm
depth for all the seed diameter classes; 13 days after sowing (DAS) for the small and medium size classes and 14
DAS for the large seed-size class. Increase in sowing depth slightly delayed emergence for one day (4cm depth) and
two days (6cm depth), for all the seed sizes. Germination was 100% for the small and medium seed sizes at all the
sowing depths and 100%, 90% and 80% for the large diameter seed class at the 2cm, 4cm and 6cm depths,
respectively. Germination duration was shortest at the 2cm sowing depth except for the small seed size. At twelve
weeks after sowing (WAS) seedlings from the large seed-size class performed better in the evaluated growth
variables despite the generally slight delay in emergence. Biomass and fresh weight were higher in large and small
seed sizes sown at 2cm with the exception of the medium size where biomass was highest at 6 cm depth. This study
revealed that sowing A. heterophyllus seeds at a depth of 2 cm is most appropriate for better germination and
growth.
Keywords: Artocarpus heterophyllus, sowing depths, seed sizes, germination, early seedling growth