EVALUASI PENGGUNAAN LYSIMETER UNTUK MENDUGA EVAPOTRANSPIRASI STANDAR DAN EVAPOTRANSPIRASI TANAMAN KEDELAI (Glycine max (L) Merril)
Abstrak: The purpose of this
research was to evaluate estimating method of standard evapotranspiration and
crops evapotranspiration using lysimeter than be compared with estimation
result of evaporimeter pan and Penman – Monteith model who recommendated by
FAO. Standard evapotranspiration was
estimated using reference crops and crops evapotranspiration was estimated
using soybean Kaba varieties which planted in lysimeters. Rainfall data and
standard evapotranspiration of evaporimeter pan be obtained from Agroclimate
stations of Masgar in Pesawaran distric in Lampung, and evapotranspiration
Penman – Monteith model was estimated by CROPWAT using climate data during 2007
– 2011 from Agroclimate stations of Masgar.
The estimating result of standard evapotranspiration and crops
evapotranspiration using lysimeter were higher than evaporimeter pan and model.
The estimation results of standard evapotranspiration and crop
evapotranspiration of Lysimeter was higher than the estimation evaporimeter pan
and model. The average of standard evapotranspiration during nine dasarian is 6.14 mm/day, average of crop
evapotranspiration is 7.54 mm/day, while the standard evapotranspiration of
evaporimeter pan is 3.55 mm / day, and standard evapotranspiration estimation
results with CROPWAT for November to February are 3.27; 3.20; 3.63; 3.51
mm/day. Crop coefficient (Kc) estimation results of each phase was 0.96 in the
initial phase, 1.16 in the development phase, 1.67 in the mid season phase, and
1.18 at the end season phase. Crop coefficient (Kc) Soybean lysimeter
estimation results are higher than FAO Crop coefficient recommendation. However
observed from the growth and yield of soybean plants seen their best with 10.73
gr of 100 seeds of yield. So that
suggested for further research with direct ETo measurement method can be
applied with modification or regenerated of lysimeter specifications and
construction to consider other parameters of water balance in lysimeter.
Penulis: Fadhilatul Adha,
Tumiar Katarina Manik, R.A. Bustomi Rosadi
Kode Jurnal: jppertaniandd160691
