Current state of humus in irrigated meadow-brown soils in the Republic of Armenia

Irrigated meadow-brown soils of the Ararat valley of the Republic of Armenia have been studied. It has been shown that they are characterized by low humus content, quite rapidly decreasing with depth, and the fulvo-humate and humate types of humus, the significant content of strongly bounded humin acids and the low content of mobile forms, the comparatively equal distribution of humin acids within the bounds of genetic profile. It has been noted that long-term use of these soils brings to the reduction of humus and non-hydrolysable residue.