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Registros recuperados: 48
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VARIATION IN MARGINAL RESPONSE TO NITROGEN FERTILIZER BETWEEN LOCATIONS AgEcon
Graybeal, Dale K..
A logistic growth equation with time and location varying parameters was used to model corn response to applied nitrogen. A nonlinear dummy-variable regression model provided a parsimonious representation of site and time effects on parameter values. The model was used to test for the equality of the mean marginal product of nitrogen fertilizer between locations on the coastal plain of North Carolina. Monte Carlo simulation and bootstrap simulation were used to construct finite sample covariance estimates. Results support rejection of the hypothesis that mean marginal products are equal when nitrogen is applied at 168 kg/ac. A comparison of bootstrapped errors and asymptotic errors suggests that results based on asymptotic theory are fairly reliable in...
Tipo: Journal Article Palavras-chave: Bootstrap; Corn yield; Marginal product; Nitrogen fertilizer; Nonlinear regression; Crop Production/Industries; C200; C150; Q100.
Ano: 2000 URL: http://purl.umn.edu/15502
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Yield and quality of elephant grass biomass produced in the cerrados region for bioenergy REA
Flores,Rilner A.; Urquiaga,Segundo; Alves,Bruno J. R.; Collier,Leonardo S.; Boddey,Robert M..
The objective of this study was to evaluate the performance of two genotypes of elephant grass, fertilized with and without N, for biomass production for energy use under the edaphoclimatic conditions of the Cerrado. The genotypes Roxo and Paraíso, grown in a field experiment in a Latosol in the Cerrado region were evaluated for biomass yield, nitrogen accumulation, C:N and stem:leaf ratios, fibre, ash and P and K contents and calorific value. The accumulated dry biomass ranged from 30 to 42 Mg ha-1 and showed no response to nitrogen fertilization with the lowest biomass obtained by the genotype Paraíso and the highest by Roxo. The total N accumulation followed the same pattern as for dry matter, ranging from 347 to 539 kg N ha-1. C:N and stem:leaf ratio...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pennisetum purpureum; Bioenergy; Nitrogen fertilizer.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000500003
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Yield Reserve Program Costs in the Virginia Coastal Plain AgEcon
Metcalfe, Todd; Bosch, Darrell J.; Pease, James W.; Alley, Mark M.; Phillips, Steve B..
A proposed Yield Reserve Program designed to compensate farmers for any reduced yields resulting from nitrogen (N) application rates reduced to below recommended rates is evaluated. Assuming that farmers currently follow Extension recommendations for applying N, Yield Reserve Program participation reduces expected net revenue by $10 to $13/ha. The Yield Reserve Program reduces expected net revenue by $17 to $20/ha for farmers who apply N to maximize expected net revenue. Farmers’ costs of participation increase with lower probabilities of inadequate rainfall and higher corn prices and decline with higher N prices. The Yield Reserve Program can significantly reduce N applications to cropland, which may reduce N content of surface waters, but the costs to...
Tipo: Journal Article Palavras-chave: Compliance cost; Nitrogen fertilizer; Nonpoint source pollution; Policy; Yield response function; Agricultural and Food Policy; Crop Production/Industries.
Ano: 2007 URL: http://purl.umn.edu/44697
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การจัดการธาตุอาหารพืชที่เหมาะสมเพื่อการผลิตอ้อยในดินเหนียวภาคกลาง Thai Agricultural
Daorung Kongtien; Suphakarn Luanmanee; Kobkiet Paisancharoen; Somkuan Klongchang; Somrutai Tancharoen.
Response of sugarcane to nutrient management on clayey soil in central region of Thailand was studied. The purpose was to obtain a systematic effective fertilizer recommendation for sugarcane production. This study was set up in 2 soil series, i.e. 1) Lamnarai soil series at Paisali District, Nakhon Sawan Province, and 2) Lop Buri soil series at Takfa District, Nakhon Sawan Province. An experiment on Lamnarai soils was statistical designed in split-split plot with 3 replications which main plots consisted of 1) without soil amendment and 2) amendment with 100 kg/rai of sulfur. Sub plots comprised clone 94-2-106 and LK92-11 sugarcane variety.Sub sub plots were fertilizer application rates i.e. 0-6-6, 6-6-6, 12-6-6 and 18-6-6 kg N-P2O5-K2O/rai. Another...
Tipo: Collection Palavras-chave: Optimal crop nutrient management; Sugarcane production; Clayey soil; Central of Thailand; Sulfur; Chicken manure; Nutrient management; Lamnarai soils; Lop Buri soils; Nitrogen fertilizer; อ้อย; การจัดการธาตุอาหารพืช; การผลิต; ดินเหนียว; กำมะถัน; มูลไก่; ปุ๋ยไนโตรเจน; ชุดดินลำนารายณ์; ชุดดินลพบุรี; ผลผลิต; ภาคกลาง.
Ano: 2012 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5561
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การจัดการธาตุอาหารไนโตรเจน โดยการใช้แผ่นเทียบสี (LCC) ในการปลูกข้าวนาชลประทานพันธุ์ต่าง ๆ ในภาคกลาง Thai Agricultural
Kingkaw Kunket; Somroj Prakobboon; Adul Kridwadee; Wassana Intalang; Anchalee Kramsri; Laddawan Kunnoot; Somsak Thongdeetae; Samak Yingyong; Waree Chaithep.
Aim of this study was to develop an appropriate recommendation for nitrogen management in irrigated areas of the central plain by using Leaf Color Chart (LCC). Eleven photoperiod-insensitive and 3phot operiod-sensitive rice varieties were studied for nitrogen management using LCC. The studies were conducted at Pathum Thani Rice Research Center both in wet and dry seasons during 2006-2007. Factorial in RCB with 4 replications were used which consisted of 2 factors, rice varieties and nitrogen managements. Four methods of nitrogen managements ; recommendation, application of nitrogen at LCC≤2, LCC≤3 and LCC≤4 were used in the experiments. The results showed that leaf color differs among varieties and seasons. For photoperiod-insensitive rice varieties, at...
Tipo: Collection Palavras-chave: Rice; Leaf Color Chart; Nitrogen fertilizer; Photoperiod-insensitive rice; Irrigated area; Central plain; ข้าว; แผ่นเทียบสีใบข้าว; ปุ๋ยไนโตรเจน; ข้าวไม่ไวต่อช่วงแสง; ข้าวไวต่อช่วงแสง; เขตชลประทาน; ภาคกลาง.
Ano: 2009 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5099
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การตอบสนองต่อปุ๋ยไนโตรเจนของข้าวนาชลประทานสายพันธุ์ดีในเขตภาคตะวันตก Thai Agricultural
Surin Tritilanant; Chayanunt Cham-Oun; Suthep Rhitsavang.
Response of nitrogen rates was investigated in Ratchaburi Rice Research Center during dry and wet season 2013 with 10 irrigated promissing rice lines/variety with different nitrogen rates of check 0 6 12 18 24 and 30 kg(N)/rai. The result showed rice yield in dry season 2013 at 6 18 24 and 30 kg(N)rai equal to 505.0 533.6 528.9 and 579.7 kg/rai with nonsignificant but in wet season 2013 there was different yield at 0 6 12 and 18 N-rates with 24 N-rate that gave highly yield of 622.4 kg/rai. In dry season 2013 PTT 00018-10-1-2-1 gave highly yield of 553 kg/rai but non different from RD31 check variety that gave yield of 519.29 kg/rai. The height of rice in dry season 2013 in every rates of N-fertilizer had non significant but PTT00018-10-1-2-1 had lowest...
Tipo: Collection Palavras-chave: Irrigated rice; Nitrogen fertilizer; Response; Yield; Western region; ข้าวนาชลประทาน; ปุ๋ยไนโตรเจน; การตอบสนอง; ผลผลิต; ภาคตะวันตก.
Ano: 2015 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5924
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ระยะเวลาการแบ่งใส่ปุ๋ยไนโตรเจนที่เหมาะสมสำหรับข้าวขาวดอกมะลิ 105 ที่ปลูกในนาดินเหนียว และนาดินร่วน Thai Agricultural
Jaturong Pipatpiriyanon; Chutiwat Wannasai.
Tipo: Collection Palavras-chave: Split application; Nitrogen fertilizer; Suitable timing; KDML 105; Clayey soils; Loamy soils; ข้าวขาวดอกมะลิ 105; ปุ๋ยไนโตรเจน; การแบ่งใส่ปุ๋ย; วิธีการปลูก; ระยะเวลา; ชนิดดิน; ผลผลิต.
Ano: 2003 URL: http://anchan.lib.ku.ac.th/agnet/handle/123456789/3079
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ศึกษาอัตราปุ๋ยไนโตรเจนที่เหมาะสมของข้าวลูกผสมในเขตศูนย์วิจัยข้าวปทุมธานี Thai Agricultural
Nittaya Ruensuk; Pranom Mongkonbunjong; Supaporn Janbuathong; Wassana Inthaleang.
Tipo: Collection Palavras-chave: Nitrogen fertilizer; Pathum thani rice research center; Hybrids rice; ข้าว; พันธุ์ลูกผสม; ปุ๋ยไนโตรเจน; อัตราการใส่ปุ๋ย; ผลผลิต; ฤดูนาปรัง; ฤดูนาปี; ศูนย์วิจัยข้าวปทุมธานี.
Ano: 2007 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5081
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