Effect of media and seed treatment on germination and seedling growth of papaya (Carica papaya L.) cv. Red Lady
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Date
2017-12-31
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College of Horticulture and Forestry, Jhalawar
Abstract
The present investigation entitled “Effect of media and seed treatment on germination
and seedling growth of papaya (Carica papaya L.) cv. Red Lady” was carried out during
2015-16 at College of Horticulture and Forestry, Jhalrapatan, Jhalawar. The experiment was
laid out in Completely Randomized Design with two factors repeated three times. The
treatments comprised of four different media viz. black cotton soil (M0), black cotton soil +
cocopeat (M1), black cotton soil + vermicompost (M2), black cotton soil + cocopeat +
vermicompost (M3) and seven different seed treatment chemicals viz. water soaking-control
(C0), GA3 100 ppm (C1), GA3 200 ppm (C2), Thiourea 500 ppm (C3), Thiourea 1000 ppm
(C4), Potassium nitrate (1%), Potassium nitrate (2%).
The papaya seeds sown in media black cotton soil + cocopeat + vermicompost (2:1:1)
(M3) recorded minimum required for initiation of germination (7.08), maximum germination
percentage (88.67), minimum peak period of germination (7.56), minimum span of
germination (12.47). The media black cotton soil + cocopeat + vermicompost (2:1:1) (M3)
maintained its superiority in producing maximum height of seedling (12.66 and 21.50 cm),
stem diameter (3.82 and 5.66 mm), number of leaves per seedling (9.78 and 13.40), petiole
length (6.15 and 8.43 cm), leaf perimeter (23.10 and 29.19 cm) at 4 and 6 weeks after sowing
and fresh weight of seedling (10.39 g), dry weight of seedling (1.27 g), fresh weight of root
(0.92 g), dry weight of root (0.28 g), length of longest tap root (12.69 cm), diameter of tap
root (5.69 mm), root/shoot ratio (0.23), chlorophyll content in leaves (60.27 mg/g),
osmolality (197.81 m mol/kg) was also noted in media black cotton soil + cocopeat +
vermicompost (2:1:1) (M3). The soil parameters viz. pH, EC, OC did not significantly effect
on rooting media.
Among the different seed treatment chemicals, papaya seed treated with GA3 200 ppm
was found batter for recorded minimum required for initiation of germination (6.71),
maximum germination percentage (88.16), minimum peak period of germination (7.20),
minimum span of germination (13.54). The media black cotton soil + cocopeat +
vermicompost (2:1:1) (M3) maintained its superiority in producing maximum height ofseedling (11.75 19.64 cm), stem diameter (3.68 and 4.98 mm), number of leaves per seedling
(8.66 and 12.12), petiole length (4.82 and 5.89), leaf perimeter (20.72 and 24.71 cm), fresh
weight of seedling (10.39 g), dry weight of seedling (1.27 g), fresh weight of root (0.87 g),
dry weight of root (0.25 g), length of longest tap root (11.81 cm), diameter of tap root (5.11
cm), root/shoot ratio (0.23), chlorophyll content in leaves (55.98 mg/g), osmolality (186.75 m
mol/kg). The soil parameters viz. pH, EC, OC did not significantly effect on rooting media.
Considering the interaction effect between media and seed treatment, the treatment
combination M3C2 (black cotton soil + cocopeat + vermicompost (2:1:1) and GA3 200 ppm
for 12 h) was found batter in recording minimum days required for initiation of germination,
maximum germination percentage (99.00), minimum peak period of germination (6.33),
minimum span of germination (11.33). The media black cotton soil + cocopeat +
vermicompost (2:1:1) (M3) maintained its superiority in producing maximum height of
seedling (13.05 and 23.65 cm), stem diameter (4.39 and 4.98 mm), number of leaves per
seedling (10..3 and 14.00), petiole length (6.74 and 8.43 cm), leaf perimeter (24.20 and 30.51
cm) at 4 and 6 weeks after sowing and maximum fresh weight of seedling (12.26 g), dry
weight of seedling (1.69 g), fresh weight of root (1.00 g), dry weight of root (0.25 g), length
of longest tap root (14.06 cm), diameter of tap root (6.07 mm), root/shoot ratio (0.31),
chlorophyll content in leaves (64.12 mg/g) and osmolality (244.66 m mol/kg) was
significantly affected by interaction of seed treatment with GA3 200 ppm and different
rooting media black cotton soil + cocopeat + vermicompost (2:1:1) (M3C2).
Description
Effect of media and seed treatment on germination and seedling growth of papaya (Carica papaya L.) cv. Red Lady