A study on the cycles of nitrogen, phosphorus and kalium as the nutrient elements was carried out in an agro-forestry ecosystem of the Populuu/Euramericana-Triticum sativum-Zea mays community-type, It was found that in these cycles, in terms of the whole community,N and P have a deficit and K is kept basically balanced,Each of N,P and K is accumulated in both the plant stock and the litter stock, while having a deficit in the soil stock. N, P and K have the accumulations of 317.436, 70.917 and 235.758 kg/hm...