EVALUASI LAJU EROSI DENGAN METODE PETAK KECIL DAN USLE PADA BEBERAPA KEMIRINGAN TANAH ULTISOL DENGAN TANAMAN CAMPURAN DI KECAMATAN SIBORONGBORONG KABUPATEN TAPANULI UTARA
ABSTRACT: Sloping land has a
high erosion potential if converted to agricultural land without conservation
measures. This study was aimed to measure erosion, determine tolerable erosion
rate and Erosion Hazard Level (TBE) the Ultisol soil erosion using intercropping crop
with peanuts and
corn with slope
of 9%, 19%,
and 31% in
July-October 2012 in
the District Siborongborong using
small plots and USLE predictions. The results showed that the amount of erosion
using small plots for slope 9%,
19%, and 31% were
0,3 tons (ha.years)-1,
0.52 tons (ha.years)-1,
and 0, 68 tons
(ha.years)-1 respectively with
low Erosion Hasard Level (TBE) category. USLE predictions based on 12 years of
rainfall data for the slope of 9%, 19%,
and 31% were
40.78 tons (ha.years)-1,
130.08 tons (ha.years)-1,
and 312.78 tons
(ha.years)-1 respectively with Erosion Hazard Level (TBE) category of
moderate to very high. Predictions based on the USLE 4 months rainfall data for
slope of
9%, 19%, and 31%
were 1,02 tons
(ha.years)-1, 3,28 tons
(ha.years)-1, and 7,89 tons
(ha.years)-1 respectively with
low Erosion Hazard Level (TBE) category. The amount of tolerable erosion rate
is 17,17 tons (ha.years)-1.
Key words: Erosion, Ultisol
Soil, Mixed Crops, Siborongborong
Penulis: Mardohar Aritonang,
Sumono, Lukman Adlin Harahap dan Edi Susanto
Kode Jurnal: jppertaniandd130155
