The field experiment was carried out over the period 1999-2004 on Luvi-Haplic Chernozem in Borovce, Western Slovakia (E 17º75’, N 48º58’). The location has a continental climate with an average annual temperature of 9.2 ºC and an average annual precipitation of 593 mm. A split-plot design experiment with four replicates of a six-course crop rotation was designed as follows: common pea – winter wheat and catch crops – early potato and catch crops – spring barley undersown with red clover – first year red clover – winter wheat and catch crops. The aim of the study was to calculate the input and output of carbon sources and the influence of the crop management rotation on the annual carbon balance in low-input and ecological farming system. Positive balance of carboneum in range of 2.442 ton C ha -1 in organic system and 2.66 C ha-1 in low input system was noted. Yearly balance was strongly influence by growing crops and their residue management. In organic system, the full balance (B C ) of organic matter expressed as carboneum balance was negative under growing of common peas (-0.909 ton C ha -1 ) with surplus of 6.642 ton C ha -1 during growing the potatoes. Lack of residues in potatoes (Q R = 1.201 ton C ha -1 ) was compensating with FYM application with finally positive effect on yearly carboneum balance. Evaluation of crop rotation pattern productivity was expressed as production of dry matter. The winter wheat produced significantly the higher yield of dry matter from 12.74 to 14.4 followed by red clover (11.3-13.65 ton C ha -1 ) and spring barley (9.08-9.79 ton C ha -1 ).Designed crop rotation pattern growing in organic and low input system confirm sustainable use of natural resources.

crop rotation, organic matter, carboneum balance, organic system, low-input system

Presentation: oral