KEHILANGAN NITROGEN PADA SISTEM USAHATANI JAGUNG MANIS DI LAHAN GAMBUT KALIMANTAN TENGAH (Nitrogen Lost on Sweet Corn Of Peatland Farming System in Central Kalimantan)

Suparto, H. 1)

Abstract

ABSTRACT
Application of fertilizer can increase nitrogen loss in agricultural land in the form of leaching and
volatilization. Research carried out on peat soil, done two times planting. First in the dry season to
transition with nitrogen input from urea fertilizer, cow dung manure and from rainfall. Both are
implemented in the month of transition to the rainy season with nutrient input from nitrogen derived
from pearl NPK fertilizer, chicken manure and rainfall. Nitrogen washing is obtained from
percolation water which is accommodated by lysimeter. The volume of percolation water measured
at plant age 15, 30, 45 HST and at harvest, N content in laboratory analysis. The purpose of this
research is to know total nitrogen loss and efficiency level of sweet corn farming system in
peatland. Nitrogen washing in the first study was 2.28 kg N ha-1 or 2.49% and in the second study
was 8.95 kg N ha-1 or 13.65%. The other estimated loss of volatilization in the first study was 12.80
Kg N ha-1 or 13.97% and in the second study it was 6.76 Kg N ha-1 or 10.31%. Average loss
estimated volatilization of 9.78 kg N ha-1 or 12.45% Total nitrogen loss of 19.60%, so that sweet
corn farming system on peatlands in Kalampangan Urban Palangkaraya is classified as inefficient
Keywords: Nitrogen, Sweet Corn, Peat Land