| dc.description.abstract | This research aims to examine the soil nutrient status in agroforestry systems in
Bahorok subdistrict, Langkat Regency affected by species combinations (rubber
monoculture, a rubber-Durio zibethitus, a rubber-Elaeis guineensis, a rubber Garcinia atroviridis, a rubber-Aquilaria malaccensis, a rubber-Arenga pinnata
agroforestry) and soil depths (0-20 cm, 30-60 cm). This research was conducted
from February 2023 to June 2023. The survey method was based on the concept of
Ex-post facto and designed by Factorial Randomized Block Design (RAK). The
observed parameters were N-total, P-available, and exchangeable cations of K, Ca,
Mg, and Na. Soil samples were taken by purposive sampling technique, and the
data analysis was done by Analysis of Variance (ANOVA) followed by Duncan’s
Multiple Range Test at 5%. This research was done on soil with the same texture
class so that variations in the soil nutrient concentrations were not affected by the
different soil characteristics but by the effect of different agroforestry types. The
results demonstrated that the best rubber agroforestry system was a rubber Garcinia atroviridis agroforestry where the concentrations of N, K, Ca, and Mg
were the highest, except the P-available. However, the rubber agroforestry systems
were not significant to Na. The best soil depth on rubber agroforestry systems was
0-20 cm, which showed the highest concentrations of N and K compared to 30-60
cm, but the soil depths were not significant in P, Ca, Mg, and Na concentrations.
The interactions between species combinations and soil depths in rubber
agroforestry systems were not significant in N, P, K, Ca, Mg, and Na | en_US |
