| dc.description.abstract | Forest land conversion is one of the important problems faced today.
The diverse composition of agroforestry systems makes agroforestry have a
function and role closer to forests compared to agriculture. Currently, the
implementation of the agroforestry system is still not widely used by farmers,
especially in Silaen District, Toba Regency. The purpose of this study is to
identify the distribution of agroforestry types in Silaen District, Toba Regency,
as well as to find out the best and potential agroforestry types based on soil
chemical characteristics. The research uses a survey method with a purposive
sampling technique. Soil samples were taken at 11 coordinate points with a
depth of 0-60 cm next, soil samples were analyzed in the Laboratory. The
analysis of soil samples was carried out namely soil pH, C-organic, N-total,
C/N ratio, P-available, K-exchange and Cationic Exchange Capacity (CEC).
then the results of the study are described based on the Bogor Land Research
Institute, 2005 on each parameter. Based on the results of the research, there
are 3 types of agroforestry found in Silaen District, Toba Regency, namely:
Agrisilvikultur, Agrosilvopastura and Agrosilvofishery. Si9A9 samples with
agrisilviculture type were the best type based on the results of soil chemical
analysis with pH values of 6.25 (slightly acidic), C-organic of 2.17%
(moderate), total N-of 0.15% (low), C/N ratio of 14.50 (moderate), Pavailable
of 43.59 ppm (very high), K-exchange of 238.20 mg/100g (very high),
and KTK of 24.14 me/100g (moderate). The criteria for soil chemistry of
agroforestry systems are slightly better than monoculture agriculture, but they
are still below the criteria for forest soil chemistry. | en_US |
