نوع مقاله : مقاله پژوهشی
نویسندگان
1 مربی پژوهش مرکز تحقیقات کشاورزی استان سمنان (شاهرود)
2 کارشناس ارشد مرکز تحقیقات کشاورزی استان سمنان (شاهرود)
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Eeffects of water and nitrogen levels on the yield and nitrate concentration in potato tubers was studied in a field experiment in Agricultural Research Center of Semnan (Shahrood), during 2000 and 2001. In this research a split –plot design was used with two factors. The factors included water (main plot) at four levels (50, 75, 100 and 125 percent of water requirement) and N in subplots at four levels (50,75,100 and 125percent of recommended value based on soil testing). Irrigation requirement was determined using data of class–A evaporation pan. Plants were irrigated in furrows. Irrigation amounts at the aforementioned levels were, respectively, 4000, 6000, 8000, 10000 m3.ha-1 and nitration treatments used were 200,300,400 and 500 kg.ha-1, respectively .The results showed that the effects of water and nitrogen levels and their interaction had significant effects (a=1%) on the yield, such that the maximum yield was obtained with treatments of W125N75, W125N125, W125N100, W75N125 and W75N75 corresponding to tuber yields of 27.8, 27.7, 25.8, 23.7 and 23.5 tons per hectare, respectively. The effects of water and nitrogen on the quality characteristics, such as tubers N content, dry matter and protein percent of potatoes were significant. Maximum concentration of N in tubers was obtained for W 50, while W125 gave the minimum protein percent. Highest water use efficiencies were observed in W75N125 and W75N75, corresponding to 3.97 and 3.90 kg.m-3.ha-1 respectively. The W75N75 treatment was superior to other treatments in terms of higher WUE and lower N concentration.
کلیدواژهها [English]
Porter, W.P., J. Jaeger and I. Carlson. 1999. Endoerine, immune, and behaviorl effects of aldicarb (carbamate), atrazine (tviazine), and nitrate (fertilizer) mixtures at ground water concentrations. Toxicology and Industrial Health, 15 (1-2):133-150