EVALUASI LAJU EROSI DENGAN METODE PETAK KECIL DAN USLE PADA BEBERAPA KEMIRINGAN TANAH ULTISOL TANAMAN UBI JALAR DI KECAMATAN SIBORONGBORONG KABUPATEN TAPANULI UTARA
ABSTRACT: Agricultural
cultivation, particularly food crops grown on sloping land without
conservation water and soil measures
have a high erosion potential. This study was aimed to measure the erosion by
determining the rate of allowable erosion
and erosion hazard level
on Ultisol soil
using Sweet potato
intercropping with plant
with slope of
9%, 21% and
32 % that small
plots and USLE
methods in July-October
2012 in the Siborongborong District.
The results showed
the amount of erosion using small plots for slope of 9 %, 21 % and 32 % were respectively of 0.26
tons ha-1 year-1, 0,40 tons ha-1 year-1
and 0,54 tons
ha-1 year-1 respectively
with low erosion
hazard level category.
USLE method based
on 12 years
of rainfall data for the slope of 9 %, 21 % and 32 %, were 42,49 tons ha-1
year-1 , 165,31 tons ha-1 year-1 and 351,35 tons ha-1 year-1 respectively with
moderate to very high erosion hazard level category. USLE method based on the
rainfall data 4 months the study period
for slope of 9 %, 21%, and 32 % respectively by 0,75 tons ha-1 year-1 , 2,90
tons ha-1 year-1 , and 6,09 of tons/(ha. year) with low Erosion Hazard Level category and the
magnitude of the erosion rate allowed
was 17.17 tons ha-1 year-1 or equal to 17,17 mm year-1.
Key words: Erosion, Ultisol
Soil, Sweet potato plant, Siborongborong
Penulis: Devi Yundri Bukit,
Sumono, Lukman Adlin Harahap dan Edi Susanto
Kode Jurnal: jppertaniandd130150
