Soil Carbon Contents in Agricultural Land Uses in Central Chi River Basin Mahasarakham Province

Abstract

A study of carbon contents in agricultural land uses were conducted in 4 of land uses types
such as sugarcane (SU), paddies field (PF), cassava (CA) and yam bean (YB) on central Chi River in
Mahasarakham province. The objective of this research are to quantify carbon contents and determine
relationship between soil carbon and soil properties in agricultural land uses. Soil sample were collected
at 0-25 cm of depth by disturbed and non-disturbed method. Physical and chemical soil properties including
soil bulk density, texture, soil reaction, total nitrogen, cation exchangeable capacity and soil organic
carbon were analyzed. The result show that soil texture were sandy loam and loamy sand in all land uses.
Soil reaction was very strong acid to neutral. The total soil carbon contents in each land use were
16.69±10.80, 9.46±3.57, 7.82±2.84 and 7.39±2.85 t ha-1 in paddies field, sugar cane, yam bean and

cassava respectively. The paddies field shows highest carbon contents than the others land uses with
significantly statistical different (p<0.05). There is significantly relationship (p<0.01) between soil organic
carbons and CEC, total-N, sand, silt, clay with correlation coefficient (r) were 0.794, 0.530, -0.723, 0.677
and 0.621 respectively. In addition, there is significant linear relationship between soil organic carbons
and soil properties in sugar cane, paddies field, cassava and yam bean with coefficient of determination
(R2) were 0.391, 0.748, 0.491 and 0.443 respectively