American Journal of Plant Physiology1557-45391557-4547Academic Journals Inc.10.3923/ajpp.2017.20.27KansomjetP. ThobunluepopP. LertmongkolS. SarobolE. KaewsuwanP. JunhaengP. PipattanawongN. IvanM.T. 12017121Background and Objective: Quinoa (Chenopodium quinoa Willd.), a pseudocereal is a new introduction in Thailand. The production of high grain quality and quantity which depending on various growth factor. This study focusing on planting location, nitrogen management and cultivars. This experiment was aimed to evaluate the physiological characteristics, yield and seed quality of quinoa responses to different nitrogen fertilizer rates in Thailand climate condition. Methodology: The experimental design was split-split plot in Randomized Complete Block Design (RCBD) with four replications. Main plot was planting locations (Pang-Da Research Station, Chiang Mai, Thailand (PD) and Prabathuaytom Royal Project Development Center Plant, Lamphun, Thailand (PB). Sub-plot was nitrogen fertilizer rate (0, 93.75, 187.5 and 312.5 kg N ha1) and sub-sub plot was quinoa cultivar (Moradas and Verdes). Results: The study found that at PD location showed higher of Leaf Area Index (LAI), Leaf Area Ratio (LAR), seed yield and 1,000 seed weight (1.47, 31.97 cm2 g1, 2144.20 kg ha1 and 3.00 g, respectively) over than PB location. On the other hand, PB location showed higher of seed germination (97%), germination index (7.86) and low of mean germination time (3.12 days) when compared with PD location. Furthermore, nitrogen fertilizer rate at 93.75, 187.5 and 312.5 kg N ha1 showed highest of Leaf Area Index (LAI) (1.04, 1.21 and 1.14, respectively) and Crop Growth Rate (CGR) (1.87, 1.85 and 1.48 mg cm2 day1, respectively). Then, nitrogen fertilizer rate at 93.75 and 187.5 kg N ha1 showed highest of Relative Growth Rate (RGR) (35.54 and 32.59 mg g1 day1, respectively). Additionally, nitrogen fertilizer rate at 93.75, 187.5 and 312.5 kg N ha1 resulted higher of seed yield (1872.00, 1726.70 and 1822.20 kg ha1, respectively) than those control. Nitrogen fertilizer rate at 187.5 kg N ha1 revealed higher of 1,000 seed weight at (3.02 g) than 93.75 kg N ha1 and control. Therefore, Verdes cultivar provided the good physiological responses than those Moradas cultivar. Verdes cultivar showed higher of CGR ( 1.87 mg cm2 day1), RGR (31.80 mg g1 day1), seed yield (1892.80 kg ha1) and 1,000 seed weight (2.97 g) over than Moradas cultivar. Conclusion: Finally, it could be concluded that at PD research station was high responded to that nitrogen fertilizer rates and cultivars for increased crop physiological growth and improved seed yield of quinoa production in Thailand.]]>Bhargava, A., S. Shukla and D. Ohri,2006Chenopodium quinoa-an Indian perspective.]]>237387Shams, A.,20111318325Kaveeta, L., M. Nanakorn, S. Suwanwong and S. Tantiwiwat,2009Pages: 261Pages: 261Oelke, E.A., D.H. Putnam, T.M. Teynor and E.S. Oplinger,19921992Basra, S.M.A., S. Iqbal, and I. Afzal,201416886892Erley, G.S.A., H.P. Kaul, M. Kruse and W. Aufhammer,20052295100Ainika, J.N., B.M. Auwalu and A.U. Yusuf,2011Amaranthus cruentus L.) to nitrogen and farmyard manure rates in Northern Guinea and Sudan savanna ecological zones of Nigeria.]]>14649Pospisil, A., M. pospisil, B. Varga and Z. Svecnjak,2006Amaranthus spp.) as influenced by the nitrogen fertilization.]]>25250253Hunt, R.,1978Pages: 67Pages: 67ISTA.,2011Pages: 540Pages: 540Munir, H., S.M.A. Basra, M.A. Cheema and A. Wahid,2011Chenopodium quinoa Willd.) germplasm for seedling vigor and viability.]]>48255261Kineber, M.E.A.,19911991Shu, Y.J., S. Wang, Y. Tao, L.R. Song, L.Y. Huang, Y.L. Zhou and H. Ma,20142513801386, (In Chinese)Carlsson, R., P. Hanczakowski and T. Kaptur,1984Chenopodium quinoa Willd. grown at different levels of fertilizer nitrogen.]]>11239245Thanapornpoonpong, S.,2004Amaranthus spp.) and quinoa (Chenopodium quinoa Willd.).]]>2004Shams, A.S.,20122012pp: 195205Gomaa, E.F.,2013Chenopodium quinoa).]]>952105222Geren, H.,2015Chenopodium quinoa Willd.) under Mediterranean climatic conditions.]]>205964Kansomjet, P., P. Thobunluepop, N. Tonmukayakul, P. Boonkorkaew and P. Junhaeng et al.,2014459396Bertero, H.D.,2001Chenopodium quinoa Willd.) under field conditions.]]>87495502Kansomjet, P., P. Thobunluepop, N. Tonmukayakul, P. Boonkorkaew and P. Junhaeng et al.,201445481484