| dc.description.abstract | Lettuce (Lactuca sativa L.) is a vegetable plant that is generally consumed
by the community for its leaves as a source of high vitamin C. Excessive and
continuous use of inorganic fertilizers can have a negative impact on soil fertility.
Therefore, the use of organic fertilizers such as chicken manure is an
environmentally friendly alternative because it can increase the organic matter
content of the soil. In addition, proper planting distance can reduce competition
between plants in obtaining light, water, and nutrients, so that it can support plant
growth and yield. This research was conducted in Sempajaya Village, Berastagi
District, Karo Regency, North Sumatra. This location is at coordinates 3º11'03'' E
and 98º30'54''S with an altitude of ± 900 m above sea level via Global Positioning
System starting from October to December 2024; used a Factorial Randomized
Complete Block Design consisting of 2 factors with 3 replications. The first factor
is various planting distances: 40 x 20 cm, 30 x 20 cm, 20 x 20 cm. The second
factor is the dose of chicken manure: 0, 8, 16, 24 tons/ha. Plant height, number of
leaves, stem diameter, total fresh weight, fresh weight of crown, fresh weight of
root, fresh weight of sale, the highest harvest index was obtained from a planting
distance of 30 x 20 cm which was not significantly different from a planting
distance of 20 x 20 cm. A planting distance of 20 x 20 cm significantly produced
the highest total fresh weight/1,6m2. A dose of chicken manure of 24 tons/ha
significantly produced the highest plant height, number of leaves, stem diameter,
total fresh weight, fresh weight of crown, fresh weight of root, fresh weight of
sale, harvest index, and total fresh weight/1,6m2. The interaction between planting
distance and dose of chicken manure had no significant effect on all observed
parameters. | en_US |
