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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Influences of Sources and Rates of Nitrogen Fertilizers on Para Grass Brachiaria mutica (Forsk.) Stapf Grown in the Central Part of Thailand) ผู้เขียน: Somporn Konyong,  นายวิโรจ อิ่มพิทักษ์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractPot experiment was established to determine the influences of three nitrogen sources (ammonium sulfate, ammonium chloride and urea) and five nitrogen rates (0,O. 64,1.28,1.92 and 2.56 gNlpot or 0,40,80,120 and 160 kgN1rai) on oven-dry forage yields, N yields and N recovery of para grass grown on Nakhon Pathom, Kamphaeng Saen, Muak Lek and Chai Badan soil series. These four soil series were the most common soils used for growing forage crops for dairy production in the western and central parts of Thailand. The experiment was conducted at Kasetsart University (Bangkhen campus) for a period of six months. Oven-dry forage yields and N yields of para grass grown on all soil series applied with different sources of N fertilizer were the highest at N rate of 2.56 gNlpot, but the highest response per unit of N fertilizer used were found at the rates ranged from 0.64 - 1.28 gN1pot. Oven-dry forage yields were increased at the same amount from all N sources and all of the soil series except Muak Lek soil, when fertilizer N were applied at low rate (0.64 gN1pot). However, oven-dry forage yields from urea N source were lower than those from other N sources when fertilizer N were applied at higher rate (1.28 - 2.56 gN1pot) on all of the soil series except Nakhon Pathom soil series which is acid soil. Oven-dry forage yields and N yields of para grass grown on Muak Lek soil series were the highest when fertilizer N were not applied. But oven-dry forage yields and N yields of para grass grown on Chai Badan soil series gave the highest response to all rates of fertilizer N. Recovery of fertilizer N in oven-dry forage yields from all soil series was the highest from ammonium sulfate N source and the lowest from urea N source. Average recovery of fertilizer N in over-dry forage yields grown on Nakhon Pathom (60%), Chai Badan (58%) and Kamphaeng Saen (55%) soil series were higher than that from Muak Lek (44%) soil series. |
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. |
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