 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Screening of Tomato (Lycopersicon esculentum Mill.) Varieties for Resistance to Branched Broomrape (Orobanche ramosa L.)) ผู้เขียน: Etagegnehu G. Mariam, รังสิต สุวรรณเขตนิคม สื่อสิ่งพิมพ์:pdf AbstractThirty tomato varieties were evaluated for branched broomrape resistance in pot experiments under natural conditions in Central Rift Valley of Ethiopia. The susceptible variety of tomato Roma VFN was used as a control. Percent yield loss of tomato due to branched broomrape was used as a main parameter and number and dry weight of branched broomrape shoot per tomato plant, were used as support parameters. Results revealed that the highest levels of resistance were found in varieties, LE 244, LE 180 A, South Africa, CLN 2123 A, Florida MHI UCG, Riogrande, Melekashola and Seedathip, with yield losses of 32% to 43% and numbers of parasite per plant were 7.0 to 13.0. Caribe and Floradade varieties were found to be highly susceptible to branched broomrape with yield losses 74% and 75% respectively. Thirty one and thirty three branched broomrape shoots developed on their roots. The percent yield loss (37%) of South Africa variety seemed minimal compared to the varieties parasitized by lower and equal number of branched broomrape. This indicated that South Africa variety was less affected by the parasite. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effect of Nitrogen Fertilizers on Branched Broomrape
(Orobanche ramosa L.) in Tomato (Lycopersicon esculentum Mill.)) ผู้เขียน:Etagegnehu G. Mariam, รังสิต สุวรรณเขตนิคม สื่อสิ่งพิมพ์:pdf AbstractA pot experiment was conducted under natural conditions at Melkasa Agricultural Research
Center, Central Ethiopia to study the effects of various levels of nitrogen, applied as ammonium nitrate
(NH4NO3), ammonium sulfate (NH4)2SO4, urea (NH2CONH2), chicken, cow, and goat manure on
branched broomrape (Orobanche ramosa L.). Parasitism occurred most in untreated and treated pots with
low N fertilizer and manure. Urea at 276 and 207 kg N/ha, ammonium nitrate, and ammonium sulfate at
207 kg N/ha and the goat manure at 20 and 30 t/ha were found to be most effective in reducing parasitism
and enhancing growth of tomato plants. Even though drastic reduction of branched broomrape infestation
was obtained, ammonium nitrate and ammonium sulfate at 276 kg N/ha seemed to be injurious to tomato
plants. As nitrogen rates increased, the numbers and dry weights of shoot of branched broomrape
decreased and the yields of tomato increased linearly except the yields obtained from the highest rate of
ammonium nitrate and ammonium sulfate. This result indicated that branched broomrape infestation of
tomato decreased with increases of soil nitrogen. |