Abstract:
In Indonesia, vegetable farmers use manure to increase production. In fact, one of the
sources of heavy metal pollution on agricultural land is the use of manure. This study, therefore,
aims to determine the content of heavy metals in the leaves of Crassocephalum crepidioides, due
to fertilization, involving the use of several types of manure. Furthermore, it is possible to apply
the results in the establishment of dose limiting policies for vegetable crops, in an attempt to
prevent dangers to the consumer. The tested sources consisted of chicken, goat, and cow manure,
as well as a control (without manure), and each was applied at a dose of 20 tons/Ha. Meanwhile,
the third leaf of the upper part of the plant was analyzed using Atomic Absorption
Spectrophotometer (AAS), to determine Cu, Pb, Zn and Cd. The results showed the leaves of
Crassocephalum crepidioides fertilized with 20 tons/Ha of chicken manure, goat manure and
cattle manure had low heavy metal (below the set threshold of 50, 100-400, and 5-30 ppm for
Pb, Zn and Cd, respectively). However, at a dose of 20 tons/Ha, the leaves pastored with goat
and cow manure had a high content of Cu (209.78 and 530.90 ppm) than control and chicken
manure (67,92 and 92,68 ppm), which are higher than the established threshold. Meanwhile,
those fertilized with chicken compost, had better area and plant height value, compared to the
goat and cow sources.
