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The natural law fertilisation, the acid reaction an d i ternal slow drainage are the main characteristi cs of brown soils (8). If we add to these the low degree of structure (27 36 %), the temporary excess of humidity and the big deposits of weed seeds in the soil, we get an a lmost complete picture of the restrictive productio n factors on brown soils in our country (6). Related to these above, the specialized literature (3,4) underline the fact that biochemical processes  which take place in the non-structured and slightly aired soils are too lean and they could lead to th e increase of the content of some substances (fulvic acids) which affect the clay (5) . To prevent these phenomena from happenning, the soils must be aired when the C / N ratio, accessible, reaches the normal values (40 70), the microbian activity is well stimulated and has favou rable effects upon all the chemical transformations in the soil and finally increases the fertility degree of soils , like the brown ones (7). These are some aspects about the improvement of the supplying process of the soil with nutritional elements which are necessary for the growth and dev elopment of the cultivated plants. Another important problem is the one reffering to t he general deposits of weed seeds remained in the ground and especially the brown soils. A great numb er of weed seeds up to the depth of the arable laye r (0 20 cm), leads implicitly to a high degree of weed grow ing which can determine a series of negative effec ts upon plants and can partially or totally compromise the culture (1). Brown luvic soils are characterized by acid reactio n, l w internal drainage, low structuring level (27 36%), temporary water excess and high content weed s bank. All these factors are considered to be l imited in Romania (2). An important problem refers to soil weeds seed bank with special reference to brown luvic soils. A great number of seeds can be found in first 20 cent im ters of soil (plowing layer). This fact causes a high weeds density which have a negative effect on the cultiva ted plants leading to partial or total crop loss (9 ).

influence of crop rotation and nutrition regime in winter wheat on the phytomass remains and the deposits of weed seeds remained in the ground