Nitrogen Fertilizing Systems and Harvest ... - Semantic Scholar
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Nitrogen Fertilizing Systems and Harvest ... - Semantic Scholar
Nitrogen Fertilizing Systems and Harvest Frequency Effects on Percent Hardseedness and Hardseed Breakdown Trend in Annual Medic (Medicago scutellata Var. Robinson) A.H. Agha Ahmadi and M.R. Chaichi Department of Crop Production and Plant Breeding, College of Agronomy and Animal Sciences, University of Tehran, Iran Abstract: The study was conducted to determine the effects of nitrogen fertilizing systems and harvest frequency on levels of hard-seedness and hard-seed softening trend in M. scutellata var. Robinson. The study was carried out at Agricultural Research Farm of University of Tehran in Karaj during 2006. The experimental design was a randomized complete block with a split-split plot arrangement with four replications. Rhizobium meliloti inoculation and four levels of chemical nitrogen fertilizer (0, 25, 75 and 125 kg N ha 1) were allocated to the main plots while four levels of harvest frequencies (weekly interval, two weeks interval, three weeks interval and control with only one harvest at %50 flowering) were assigned to subplots. Months of post harvest period of hard-seed breakdown after the last harvest in August were assumed as split-split plots in time. The rate of hard-seed softening was measured during post harvest period from August 2006 to March 2007. According to the results of this study, levels of hard-seedness decreased with increment in frequency of harvest. Nitrogen application of 125 kg ha 1 produced the highest percent of hard-seedness (p
