ﺗﺄﺛﻴﺮ ﭘﺮورش اردک و آزوﻻ ( Azolla sp ) ﺑﺮ اﻟﮕﻮی ﭘﺮاﻛﻨﺶ ﺑﺎﻧﻚ ﺑﺬر ﻋﻠﻒﻫﺮز اوﻳﺎرﺳﻼم (Cyperus spp) در ﻛﺸﺖ ﺗﻠﻔﻴﻘﻲ ﺑﺮﻧﺞ

A field experiment was conducted to investigate the effects of duck and azolla along with nitrogen
fertilizer on distribution pattern of nutsedge (Cyperus spp.) seed bank using kriging method in 2012
at the Sari Agricultural Sciences and Natural Resources University. Sampling of nutsedge seed bank
and seedling were performed in 48-point from 0-30 cm of soil depth. All data were transferred to
the RockWork99 software to draw maps of nutsedge seed and seedling distribution. The results of
spatial distribution maps indicated that the weeds seed bank was patches with different sizes and
densities. The number of seeds in the center of the patches was estimated about 60000 seed per
square meter that this center changed with duck treatments and was consistent with plots without
duck. However, the number of seeds decreased in the end of season compared with the first of
season. Overall, the results showed that integration of 800 and 1200 duck pieces with rice
cultivation were effective to control nutsedge and to reduce seed bank.