M.A. Thesis:

Quantitative Reaction of Nitrogen in Fennel

In order to study the quantification of nitrogen uptake on a factorial experimental fennel plant in a randomized complete block design with three replications, the first factor consisting of three planting dates (23 March 96, 8 April 97 and 30 April 97) and the second type of fertilizer. Nitrogen was applied at three levels (control, ammonium sulfate (21% nitrogen), ammonium nitrate (25% nitrogen) at a concentration of 1 per thousand (fertilizer) in a personal farm in Kizor village, Sabzevar, Iran. Dry matter regrowth and dry weight at anthesis resulted from ammonium nitrate intake as well as maximum 1000-grain dry weight of plant. At maturity, economic yield and dry weight at maturity were obtained as a result of ammonium sulfate consumption. The highest dry matter remobilization, dry weight at maturity, 1000-grain weight and harvest index were obtained at the first planting date. The highest economic yield was also obtained at the second planting date. According to the results, foliar application of ammonium sulfate up to a thousand in each growth can be recommended to produce maximum yield and yield components of fennel. Various planting dates showed that nitrogen fertilization delayed with no nitrogen fertilizer delay, but ammonium nitrate and ammonium sulfate application decreased, especially from the second planting date to the third nitrogen remobilization rate Increasing nitrogen remobilization rate decreased grain yield and this decrease was more pronounced in the absence of nitrogen and ammonium sulfate consumption, whereas in the ammonium nitrate treatment at all three planting dates with a slope equal to the decrease Investigation of the effect of total nitrogen on maturity on physiological efficiency of nitrogen application showed that under all conditions of application and non-application of nitrogen fertilizer, as total nitrogen increased in maturity, physiological efficiency of nitrogen application decreased but slope decrease in ammonium nitrate.

Keywords: Quantification, Fennel, Nitrogen, Planting date