The purpose of this paper was to assess the labour efficiency in agriculture against the background of the obtained plant production in agricultural farms. First, labour inputs and raw materials and materials inputs were assessed; size of the global agricultural production in the investigated farms was also determined. It was indispensable for calculation of the net production and then of labour efficiency. The scope of work covered research in 30 farms located on the territory of Miechów commune, Małopolskie Voivodeship. Selection of farms was intentional- objects were only plant production occurred. The highest level of total agricultural production (plant) was characteristic for vegetable production. Unitary global production in this case was 8244.3 PLN·ha -1. For comparison grains production was 2295.2 PLN·ha -1 of grains and production of root crops was 6140.3 PLN·ha -1. The assessed total labour efficiency was 11 PLN·man hour-1. The highest was for farms from the 3 rd area group (where vegetables cultivation prevails). In this case PLN 46.8 was for one man hour. The second group of objects (from 5 to 10 ha) obtained a positive efficiency index, however its value was only 4.7 PLN·man hour -1. A very disadvantageous phenomena was reported in case of the smallest farms of 5 ha area – the evaluated index was valued under zero and was -26.5 PLN·man hour -1. In these farms, overinvesting in the machinery park is noticeable, which utilized to a low extent influences high indirect costs related to inter alia amortization of the fixed means.