The main objective of this study consists in the effect of some tillage systems on pedomorphological indicators of cross section made in experimental field Ezăreni – Iasi, on the development of advanced agricultural technologies for crop cultivation. In Romania have been conducted many researches on the influence of various tillage systems on physical, chemical and biological indicators and their residual effect, and less insisted on the morphological changes. The study of pedomorphological indicators have been accomplished on cross section (2x0.7m) performed after harvesting maize and the variants were: ploughed at 30 cm depth (V 1 ), paraplow (V 2 ), chisel (V 3 ) and disk harrow (V 4 ). The novelty and originality of the study consists in illustrating the morphological indicators through images performed from cross section and processed with special programs. The morphological description of cross section of cambic chernozem was based on the pedomorphological indicators presented in development methodology of pedological study (vol. III, I.C.P.A., 1987). Pedomorphological indicators of soil cross section may be an additional criteria in choosing a tillage system suited to local climatic features. In conditions of very dry spring, the pedomorphological indicators of cross section where the soil was performed with disk harrow shows on the 9 cm and 21 cm depth a loosening – compactated state aspect confirmed by the values of bulk density between 1.27 and 1.62 g / cm 3 . The presence of compact layer on soil surface prevent water infiltration and retention of greater quantities of water in the layer 0 - 9 cm. Effect of drought on plant growth and development was emphasized, whereas much of the water retained in the surface layer of soil is lost through direct evaporation and could not be used by plants.

pedomorphological indicators; soil physical properties; management systems; soil tillage; maize crop

Presentation: oral