In order to determine the critical periods of weed control in dry bean, an experiment was conducted in 2011 at Agricultural and Natural Research Center of Hamadan, Iran. The experiment was a randomized complete blocks design with 12 treatments and 3 replications. Treatments were divided into two groups. The first group included weed interference periods until 10, 20, 30, 40 and 50 days after em...

The purpose of this study is to determine the long-term variations in rainfall data as well as to identify wet and dry periods of 35 synoptic stations in Iran. In order to know the variation of rainfall in studied stations, average maps, coefficient of variation and skewness were drawn. Then, using the Mann-Kendall test, the significance of the trend on each station was tested at 95% confidence...

Spatio-temporal variations of factors affecting the occurrence of precipitation can lead to a change in its amount. The atmospheric moisture is one of the most important factors for precipitation formation. In this study, changes in atmospheric moisture and its relation with occurrence of seasonal wet and dry periods were investigated in Iran. The re-analysis data from the ERA interim European ...