Consulta: subjectFacets:"Nitrogen use efficiency"
Registros recuperados: 17
Data/hora: 05/06/2024 10:42:39

Natural selection for efficiency in the use of nitrogen in common bean identified by analysis of microsatellites and grain yield
Provedor de dados: 69
Autores: Leite,Monik Evelin; Lima,Igor Almeida; Pereira,Dyanna Rangel; Santos,João Bosco dos.
This study was carried out in order to verify whether natural selection acts on segregating common bean populations grown in the presence and absence of N, and to verify that natural selection affects the frequency of microsatellite alleles specifically, and in order to identify those that can assist in selection. Four populations from the crosses Ouro Negro x CI-107 and VC-5 x IAPAR-81 were carried forward in bulk to F8 at both levels of N. Ouro Negro and VC-5 are considered stress tolerant to nitrogen and IAPAR-81 and CI-107 responsive. One hundred progenies were obtained from each cross and grown in the presence and absence of N. DNA was extracted from 400 progenies, of which 194 were evaluated in the rainy season and 79 in the winter crop for grain...
Tipo: Journal article
Palavras-chave: Adaptation; Nitrogen use efficiency; Phaseolus vulgaris; SSR markers.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600005

黒ボク土畑土壌における無機態窒素量とリン酸緩衝液抽出窒素量の違いが化学肥料由来窒素の利用率に与える影響
Provedor de dados: 19
Autores: 加藤, 拓; 池羽, 正晴; 谷, 昌幸; KATO, Taku; IKEBA, Masaharu; TANI, Masayuki.
本研究では，黒ボク土畑土壌において施肥窒素の利用率が無機態窒素量および易分解性有機態窒素量の違いに関連してどのように変動するかについて，15Nトレーサー法を用いて定量的に明らかにすることを目的とした．試験作物はハクサイおよびニンジンとした．ハクサイは施肥15N量と15N吸収量に正の相関を示したが，ニンジンにはその傾向は認められなかった．また，ハクサイおよびニンジンの施肥窒素吸収量に対する栽培前無機態窒素量およびリン酸緩衝液抽出窒素量の影響は認められなかった．化学肥料由来の窒素利用率は，ハクサイで53-88％，ニンジンで4-57％であり，その変動幅は著しく大きかった．各作物の15N利用率と栽培前土壌中の無機態窒素量およびリン酸緩衝液抽出窒素にも関係性が認められなかった．つまり，無機態窒素量および易分解性有機態窒素量の指標として使われているリン酸緩衝液抽出窒素量は，化学肥料由来の窒素吸収量を反映しないことが示された．以上のことから，本研究において化学肥料利用率の変動を予測するのに対し，黒ボク土畑におけるハクサイとニンジンの秋作では栽培前土壌中の無機態窒素量およびリン酸緩衝液抽出窒素量が指標とならないことが明らかとなった．
Palavras-chave: 黒ボク土; 15Nトレーサー法; 窒素利用率; 土壌診断; 畑土壌; Andosols; Nitrogen use efficiency; 15N tracer techniques; Soil diagnosis; Upland field.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3577

Urea and sugarcane straw nitrogen balance in a soil-sugarcane crop system
Provedor de dados: 86
Autores: Gava,Glauber José de Castro; Trivelin,Paulo Cesar Ocheuze; Vitti,André Cesar; Oliveira,Mauro Wagner de.
The objectives of this study were to evaluate nitrogen utilization by sugarcane ratoon from two sources, applied urea and sugarcane straw covering soil surface (trash blanket), besides the recovery of N from both sources in the soil-plant system. The following treatments were established in a randomized block design with four replicates: T1, vinasse-urea (100 kg ha-1 of urea-N) mixture applied on the total area of the soil covered with cane trash labeled with 15N; T2, vinasse-urea mixture (urea labeled with 15N; 100 kg ha-1 of urea-N) applied on the total area of the soil covered with non-labeled sugarcane trash; and T3, urea-15N (100 kg ha-1 of urea-N) applied in furrows at both sides of cane rows, with previous surface application of vinasse, onto soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N recovery; Fertilizer-15N; Crop residue; Mineralization; Nitrogen use efficiency.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000700010

Criteria for topdressing nitrogen application to common bean using chlorophyll meter
Provedor de dados: 86
Autores: Maia,Suelen Cristina Mendonça; Soratto,Rogério Peres; Liebe,Suzane Maria; Almeida,Adriana Queiroz de.
Abstract: The objective of this work was to establish the diagnostic leaf and the nitrogen sufficiency index (NSI) values most appropriate to estimate N requirement by the 'Pérola' common bean (Phaseolus vulgaris), based on chlorophyll meter monitoring. The diagnostic leaf was defined in an experiment with five N rates, and up to four sampling dates of the diagnostic leaves were evaluated (first, second, and third completely expanded leaves from the apex). The NSI was established in two crop seasons, under six N managements: M1, 40 kg ha-1 N at sowing + 80 kg ha-1 10 days after emergence (DAE) + 80 kg ha-1 20 DAE (reference rate); M2, 20 kg ha-1 at sowing + 40 kg ha-1 10 DAE + 40 kg ha-1 20 DAE (recommended rate); M3, 20 kg ha-1 at sowing + 30 kg ha-1 when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Diagnostic leaf; Nitrogen fertilization; Nitrogen sufficiency index; Nitrogen use efficiency; Relative chlorophyll index.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000700512

The Value of Regional Annual Nitrogen Needs Information for Wheat Producers in Oklahoma
Provedor de dados: 31
Autores: Roberts,   David C.; Brorsen,   B. Wade; Raun,   William R.; Solie,   John B.
Crop producers are increasingly interested in reducing nitrogen use without sacrificing yield. Technology is available for precise application at the sub-field level, but adoption has been sluggish. This paper estimates the relative profitability of a field level annual predictor of mid-season N requirements and a regional predictor of the same.
Tipo: Conference Paper or Presentation
Palavras-chave: Nitrogen seeds; Nitrogen use efficiency; Precision agriculture; Wheat; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008
URL: http://purl.umn.edu/6734

Establishing a Baseline for Nitrogen Policy Assessment
Provedor de dados: 31
Autores: Livingston,   Michael J.; Ribaudo,   Marc.
Tipo: Conference Paper or Presentation
Palavras-chave: Nitrogen; Nitrogen use efficiency; Nitrogen management; Environmental Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/60925

Economics of Pre-Plant, Topdress, and Variable Rate Nitrogen Application in Winter Wheat
Provedor de dados: 31
Autores: Boyer,   Christopher N.; Brorsen,   B. Wade; Solie,   John B.; Arnall,   D. Brian; Raun,   William R.
Past research about the efficiency of nitrogen application in winter wheat (Triticum aestivum L.) based on source and timing has produced inconsistent results. The majority of the literature used data from few locations over short time periods. This study used a unique data set of yields and nitrogen quantities from 2002-2009 at ten different locations in Oklahoma, USA. The objective of this research was to determine wheat yield response for granular pre-plant, uniform foliar topdress, and variable rate foliar topdress. Topdress liquid nitrogen had a 19% higher NUE than pre-plant urea, and was the most profitable source of nitrogen.
Tipo: Conference Paper or Presentation
Palavras-chave: Linear stochastic plateau; Nitrogen use efficiency; Profitability; Wheat; Crop Production/Industries.
Ano: 2010
URL: http://purl.umn.edu/61153

15N uptake fom manure and fertilizer sources by three consecutive crops under controlled conditions
Provedor de dados: 90
Autores: Garza,Héctor Mario Quiroga; Delgado,Jorge A.; Wong,José Antonio Cueto; Lindemann,William C.
There are several regions of the world where soil N analysis and/or N budgets are not used to determine how much N to apply, resulting in higher than needed N inputs, especially when manure is used. One such region is the North Central "La Comarca Lagunera", one of the most important dairy production areas of Mexico. We conducted a unique controlled greenhouse study using 15N fertilizer and 15N isotopic-labeled manure that was labeled under local conditions to monitor N cycling and recovery under higher N inputs. The manure-N treatment was applied only once and was incorporated in the soil before planting the first forage crop at an equivalent rate of 30, 60 and 120 Mg ha-1 dry manure. The 15N treatments were equivalent to 120 and 240 kg ha-1 (NH4)2SO4-N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Denitrification; Nitrogen use efficiency; Annual ryegrass; Salinity; Sudangrass.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500018

Yield, chemical composition, and efficiency of use of nitrogen by Marandu grass
Provedor de dados: 96
Autores: Oliveira,Tadeu Silva de; Leonel,Fernando de Paula; Pereira,José Carlos; Silva,Cássio José da; Baffa,Danielle Ferreira; Zervoudakis,Joanis Tilemahos.
The objective of this study was to evaluate the effect of five nitrogen doses on the productive and quality characteristics and the use efficiency of Brachiaria brizanthacv. Marandu grass. The treatments consisted of four doses of nitrogen (0, 60, 120, 180 and 240 kg ha-1), distributed through a completely randomized design with four replicates. Samples of the material were collected to analyze productivity variables, concentrations of neutral detergent fiber, crude protein and neutral detergent insoluble nitrogen, and in vitro dry matter digestibility. The nitrogen use efficiency, recovery of the applied nitrogen (RAN) and agronomic efficiency of the applied nitrogen (AE) were calculated. Dry mass production increased by 1,624.67 (kg/ha) as the nitrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen use efficiency; Nutritional characteristics; Urea.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000800440

Effect of fertilization with fluid swine slurry on production and nutritive value of Tifton 85
Provedor de dados: 96
Autores: Vielmo,Hernan; Bona Filho,Amadeu; Soares,André Brugnara; Assmann,Tangriani Simioni; Adami,Paulo Fernando.
The objective of this study was to evaluate the effect of different doses of liquid swine slurry on dry matter accumulation rate and nutritive values (crude proten and neutral detergent fiber) of Tifton 85 grass pasture cultivated in southwestern Paraná from October 2005 to March 2006. It was used a complete random experimental design in a 4 x 4 factorial scheme composed of four doses of swine slurry in the plots (0, 80, 160 and 320 m³/ha) and four consecutive cuts in the subplots of the pasture. It was carried out two applications, one in the beginning of the experiment and other after 80 days. Cuts were performed every time pasture height was 40 cm. There was a dose versus cut interaction for all variables. Swine slurry promoted increase on dry matter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon spp; Crude protein; Dry matter production; Neutral detergent fiber; Nitrogen recovery; Nitrogen use efficiency.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100009

NITROGEN SOIL BUDGETS IN CONTRASTING DAIRY GRAZING SYSTEMS OF SOUTHERN CHILE, A SHORT-TERM STUDY
Provedor de dados: 127
Autores: Núñez,R.P; Demanet,R; Alfaro,M; Mora,M.L.
In recent years, the intensification of livestock production in Southern Chile has resulted in a high potential for environmental damage through nitrogen (N) losses, creating the need for the evaluation of N flows from these systems. The aim of the research was to determine N budgets and N use efficiency in two grazing systems in Southern Chile. For this, inputs and outputs were measured during one year on two grazing systems (heavy grazing, HG; and light grazing, LG). Also, a control treatment with no grazing (C) was considered. The annual N soil budget was determined by the difference between all N inputs (£ inputs) and all N outputs (X outputs). The results of the experiment indicate that HG treatments received the biggest N input (427, 359 and 288 kg N...
Tipo: Journal article
Palavras-chave: Nitrogen budgets; Grazing; Nitrogen use efficiency; Nitrogen losses; Pasture.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000200008

Nitrogen availability, leaf life span and nitrogen conservation mechanisms in leaves of tropical trees
Provedor de dados: 63
Autores: Corte,Guilherme Nascimento; Macchiaverni,Patrícia; Fabbro,Inácio Maria Dal; Haddad,Claudia Regina Baptista.
Evergreen species of temperate regions are dominant in low-nutrient soils. This feature is attributed to more efficient mechanisms of nutrient economy. Nevertheless, the cashew (Anacardium occidentale- Anacardiaceae), a deciduous species, is native to regions in Brazil with sandy soil, whilst the annatto (Bixa orellana- Bixaceae), classified as an evergreen species native to tropical America, grows spontaneously in regions with more humid soils. Evergreens contain robust leaves that can resist adverse conditions for longer. The physical aspects of the leaves and mechanisms of nutrient economy between the two species were compared, in order to verify whether the deciduous species had more efficient mechanisms that might explain its occurrence in regions of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf deciduity; Nitrogen resorption proficiency; Nitrogen use efficiency; Leaf rupture strain.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600014

การจัดการธาตุอาหารพืชที่เหมาะสมเพื่อการผลิตอ้อยในดินทราย ภาคตะวันออกเฉียงเหนือ
Provedor de dados: 106
Autores: Suphakarn Luanmanee; Kobkiet Paisancharoen; Chayan Pakdeethai; Srisuda Thippayarugs; Wanlee Amonpon.
An effective nutrient management for plant cane production on sandy soil was investigated. This aimed to be a guideline of fertilizer recommendation for plant cane production on sandy soil in the Northeast of Thailand. The experiment was conducted in Ban Phai soil series at Khon Kaen Province. The experimental design was split-split plot with 3 replications. Main plots comprised 1) without soil amendment and 2) amendment with 100 kg/rai of dolomite and 1,000 kg/rai of filtercake compost. Subplots consisted of Khon Kaen 3 and LK92-11 sugarcane varieties. Sub-subplots were fertilizer application levels i.e. 0-6-18, 9-6-18, 18-6-18, and 27-6-18 kg N-P2O5-K2O/rai. The results showed that average yield of plant cane grown on infertile Ban Phai soil series...
Tipo: Collection
Palavras-chave: Sugarcane; Nutrient management; Nitrogen use efficiency; Filtercake compost; Sandy soil; Ban Phai soil series; Northeast of Thailand; อ้อย; การจัดการธาตุอาหาร; ปุ๋ยไนโตรเจน; ปุ๋ยหมักกากตะกอน; หม้อกรองอ้อย; ดินทราย; ชุดดินบ้านไผ่; พันธุ์; ผลผลิต; ภาคตะวันออกเฉียงเหนือ; จ.ขอนแก่น.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5552

Palisadegrass effects on N fertilizer dynamic in intercropping systems with corn
Provedor de dados: 42
Autores: ALMEIDA,RODRIGO E.M. DE; OLIVEIRA,SILAS M. DE; LAGO,BRUNO C.; P. JUNIOR,CLOVIS; TRIVELIN,PAULO C.O.; FAVARIN,JOSÉ L.
ABSTRACT Corn grain yield, nitrogen (N) fertilizer efficiency and distribution to corn alone and three forms of corn and palisadegrass (Urochloa spp.) intercropping implantation was investigated. A field experiment with 15N labeling fertilizer was performed in randomized block design. No form of palisadegrass intercropping implantation affected corn grain yield, total N accumulation and N use efficiency (NUE), which were 8.7 t ha-1, 205 kg ha-1 and 37% respectively. The palisadegrass produced on average 1.9 t of dry mass, absorbing a maximum of 6 kg ha-1 or 5.5% of N fertilizer during corn growing. Furthermore, the palisadegrass did not affect N fertilizer distribution in soil-plant system, in which 28.2% was recovered in the soil and 40.4% in the plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 15N isotope; Crop-livestock integration; Nitrogen use efficiency; No-tillage; Urochloa spp.; Zea mays.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401917

Selection of maize top-crosses for different nitrogen levels through specific combining ability
Provedor de dados: 53
Autores: Heinz,Rafael; Ribeiro,Larissa Pereira; Gonçalves,Manoel Carlos; Bhering,Leonardo Lopes; Teodoro,Paulo Eduardo.
ABSTRACT An alternative to increase yield without raising the production costs and minimizing the dependence of agricultural inputs is the development of maize genotypes presenting high nitrogen (N) use efficiency under low N level conditions. Thus, the objective of this study was to estimate the specific combining ability of maize top-crosses under high and low nitrogen (N) conditions and to select high-yielding hybrids for both conditions. The grain yield of 110 top-cross hybrids was evaluated in 2012 in two locations in the Brazilian Midwest. Partial diallel analysis was performed with the adjusted means of each of the individual top-cross analyses. Specific combining ability (SCA) of the hybrids and their interaction with N levels was estimated for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Diallel; Hybrid combination; Nitrogen use efficiency.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200208

Evaluation of fertilization with uncoated urea and 3,4-dimethylpyrazole phosphate (DMPP)-coated urea on nitrogen leaching and rose (Rosa spp.) yield
Provedor de dados: 117
Autores: García-Castro,Alexandra; Restrepo-Díaz,Hermann.
The negative impact of N over-fertilization has acquired importance in rose (Rosa spp.) growers in Colombia. The nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) has been considered a valuable alternative to diminish the N losses by leaching and to enable more efficient N use efficiency in crops. The objective of the present work was to study the effect of DMPP on the mineral N (NH4+- N and NO3--N) content in soil and water leaching, and physiological characteristics of rose plants. A greenhouse experiment was performed for 10 wk. Four-year-old 'Charlotte' rose cultivars grafted on 'Natal Briar' were grown in soil and fertirrigated daily with a complete nutrient solution containing 170 mg N L-1. Two N fertilizers (uncoated urea [UA], and urea...
Tipo: Journal article
Palavras-chave: Chlorophyll fluorescence; Leaf nitrogen concentration; Nitrate leaching; Nitrogen use efficiency.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200011

Effects of Nitrogen on Productivity, Grain Quality, and Optimal Nitrogen Rates in Winter Wheat cv. Kumpa-INIA in Andisols of Southern Chile
Provedor de dados: 117
Autores: Campillo,Ricardo; Jobet,Claudio; Undurraga,Pablo.
Nitrogen is one of the main inputs of the winter wheat crop (Triticum aestivum L.) in southern Chile. Nitrogen efficient management is basic to optimizing its utilization while decreasing pollution risks and operational costs. Crop response and N use efficiency (NUE, defined as the ratio of yield to mineral N supply, regardless of source) are important for evaluating N requirements of winter wheat, and reaching maximum and economic yields. The objective of this study was to determine the effect of N rate on grain yield, calculate the N rate that maximizes yield, and estimate the optimal grain yield rate and quality of high-yielding winter wheat cv. Kumpa-INIA. Five annual N rates were evaluated in a randomized complete block design during two successive...
Tipo: Journal article
Palavras-chave: Nitrogen level; Nitrogen use efficiency; Andisols.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100013