Effect of chemical treatment, method and time of sowing on seed germination of ornamental trees
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
The present investigations entitled “Effect of chemical treatment, method and time of
sowing on seed germination of ornamental trees” were carried out at the Research Farm of the
Department of Floriculture and Landscaping, Punjab Agricultural University, Ludhiana
during the year 2015- 2017. Ten trees were selected namely Alstonia scholaris, Cedrella
toona, Chukrasia tabularis, Delonix regia, Jacaranda acutifolia, Koelreuteria paniculata,
Melia azedarach, Mimusops elengi, Peltophorum ferrugineum and Putranjiva roxburghii
with water soaking, mechanical and chemical scarification treatments. Chemical scarification
was given by H2SO4 (50%), KNO3 (0.3%) and thiourea (0.5%). In sub treatments method of
sowing i.e. 1) polythene bags 2) raised bed and the sowing was done in June and March to
find out the best method of sowing season. Treatments were replicated three times under
factorial randomized block design. Maximum germination under mechanical scarification was
noted in Delonix regia, Melia azedarch in March and Cedrella toona and Chukrasia tabularis
in June while under chemical scarification maximum germination percentage was recorded in
Mimusops elengi, Peltophorum ferrugineum and Putranjiva roxburghii with H2SO4 treatment
over mechanical and control. KNO3 treatment resulted in higher germination percentage in
Alstonia scholaris and Jacaranda acutifolia than other treatments. However, the treatment of
Koelreuteria paniculata seeds failed to initiate germination in in both the seasons in
polythene bags as well as on raised bed. Days taken to germination was less under H2SO4
treatment in Delonix regia and Mimusops elengi but in Alstonia scholaris, Jacaranda
acutifolia and Cedrella toona minimum days taken for germination were recorded in KNO3
treatment. The maximum seedling height was observed in June as compared to March.
Numbers of leaves were more in June in polythene bags as compared to March on raised
beds. Maximum survival percentage was recorded in of Alstonia scholaris, Delonix regia and
Mimusops elengi in KNO3 treatment. Maximum leaf area was recorded in Alstonia scholaris
in KNO3 treatment but in Mimusops elengi, Peltophorum ferrugineum and Putranjiva
roxburghii maximum leaf area was recorded H2SO4 treatment.
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