Effects of laser leveling and tillage on spatial correlation, population dynamic and weeds seed bank

Subject Areas : Journal of Plant Ecophysiology

M. Yosefi ¹ , M.J. Bahrani ² , E. Kazeroni Monfared ³ , M. Dastory ⁴

1 - دانش آموخته کارشناسی ارشد و مدرس دانشگاه پیام نور واحد زرین دشت
2 - استاد دانشگاه شیراز
3 - استادیار دانشگاه جامع علمی کاربردی گیلان
4 - استادیار دانشگاه آزاد اسلامی واحد شیراز

Received: 2014-09-24 Accepted : 2014-09-24 Published : 2014-09-01

Keywords: spatial distribution, flora, Distribution pattern,

Abstract :

Weeds are present in all agroecosystems and their presence depends on seeds in soil. Information on seeds bank and their effective environmental factors provide possibility for their prediction in future weeds seedlings density. An experiment was conducted in three separated fields at Zarrin dasht in the southwest of Shiraz, Iran, to determine the effect of laser leveling on seed bank and the dynamic of weeds population in year 2010. The field was divided into 20 × 20 m2 grids for sampling. The sample was taken at the intersection of each unit at two depths of 0-15 and 15-30 cm and number of weed seeds were counted. Results showed that laser leveling operations had different effects on weed seeds density and distribution so that 30٪ of weed seed density and spot deterioration decreased. All weed seed spots had a high seed density in the center and gradually decreased within their fringes. On the other hand, although structural position of weed seed population were maintained prior and after leveling, it had a decreasing trend in this crop rotations