Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 21
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil. Repositório Alice
GROPPO, J. D.; LINS, S. R. M.; CAMARGO, P. B.; ASSAD, E. D.; PINTO, H. S.; MARTINS, S. C.; SALGADO, P. R.; EVANGELISTA, B.; VASCONCELLOS, E.; SANO, E. E.; PAVÃO, E.; LUNA, R.; MARTINELLI, L. A..
Abstract. In this paper, soil carbon, nitrogen and phosphorus concentrations and stocks were investigated in agricultural and natural areas in 17 plot-level paired sites and in a regional survey encompassing more than 100 pasture soils In the paired sites, elemental soil concentrations and stocks were determined in native vegetation (forests and savannas), pastures and crop-livestock systems (CPSs). Nutrient stocks were calculated for the soil depth intervals 0-10, 0-30, and 0-60 cm for the paired sites and 0-10, and 0-30 cm for the pasture regional survey by sum stocks obtained in each sampling intervals (0-5, 5-10, 10-20, 20-30, 30-40, 40-60 cm). Overall, there were significant differences in soil element concentrations and ratios between different land...
Tipo: Artigo de periódico Palavras-chave: Nutrientes no solo; Estoque de nitrogênio; Estoque de carbono; Estoque de fósforo; Concentração de nitrogênio; Concentração de carbono; Concentração de fósforo; Estequiometria; Agricultura; Solo; Agriculture; Nitrogen content; Carbon sinks; Soil; Soil nutrient balance; Stoichiometry.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1038618
Imagem não selecionada

Imprime registro no formato completo
Comparative performance of leaf color chart with other nitrogen scheduling practices International Rice Research Institute
Sheoran, P.; Singh, K. P.; Malik, R. K.; Kumar, M..
p.60-61
Palavras-chave: Nitrogen; Fertilizers; Application rates; Nitrogen content; Leaves; Colour; Charts; Chlorophyll.
Ano: 2004 URL: http://hdl.handle.net/123456789/808
Imagem não selecionada

Imprime registro no formato completo
Desempenho de medidor portátil de clorofila no monitoramento de folhas de mandioca em área previamente ocupada por capoeira enriquecida. Repositório Alice
SOUSA, N. C.; COIMBRA, H. M.; TRINDADE, I. A.; SOUZA, C. M. de A.; SÁ, T. D. de A..
Tipo: Parte de livro Palavras-chave: Folha de mandioca; Teor de clorofila; Concentração de nitrogênio; Chlorophylls; Measuring instruments; Instrumento de Medida; Cassava; Leaves; Nitrogen content.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/399029
Imagem não selecionada

Imprime registro no formato completo
Diagnosis de nitrógeno en chile de agua identificada por reflectancia. Colegio de Postgraduados
San Juan Martínez, Erwin.
El diagnóstico oportuno del estado nutrimental de los cultivos en la agricultura de precisión es de suma importancia y vitalidad; por lo que cada vez se hacen más necesarias técnicas que permitan conocer el estado nutrimental del cultivo de forma rápida, precisa y confiable. Es por ello que el presente trabajo tuvo como objetivo determinar la concentración de nitrógeno foliar en chile de agua mediante reflectancia, dicha característica se obtuvo por medio de equipos como: radiómetro (CROPSCAN), escáner de escritorio y cámara fotográfica digital, de igual forma se determinó un índice de verdor utilizando el medidor portátil SPAD Minolta 502 y, la concentración de nitrógeno foliar por el método Kjeldahl. A partir de esas mediciones y con el programa Curve...
Palavras-chave: Agricultura de precisión; Firmas espectrales; Nutriente; Precision agriculture; Spectral signatures; Nitrogen content; Edafología; Maestría.
Ano: 2014 URL: http://hdl.handle.net/10521/2285
Imagem não selecionada

Imprime registro no formato completo
Efeito da inundação sobre as propriedades químicas e eletroquímicas de um glei pouco humido do rio Guamá, município de Belém e Santa Isabel, Pará-Brasil. Repositório Alice
FERREIRA, W. de A.; MODESTO JUNIOR, M. de S.; BOTELHO, S. M.; MASCARENHAS, R. E. B..
Tipo: Parte de livro Palavras-chave: Conteúdo da matéria orgânica; Conteúdo de nitrogênio; Pastejo rotacionado; Soil mechamics organic matter; Mecânica do Solo; Nitrogen content; Rotational grazing.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/394903
Imagem não selecionada

Imprime registro no formato completo
Effects of irrigation methods on the yield, water requirement and nitrogen utilization of lowland rice International Rice Research Institute
Chang, Shueh-kun.
170 leaves : ill. (some col.). Thesis (M.S.) -- University of the Philippines
Tipo: Thesis Palavras-chave: Rice; Irrigation; Water requirements; Plant-water relations; Nitrogen content; Yields.
Ano: 1965 URL: http://hdl.handle.net/123456789/424
Imagem não selecionada

Imprime registro no formato completo
Einfluss der Grndngung mit stengelknllchenbildenden Leguminosen (Sesbania rostrata und Aeschynomene afraspera) auf die Stickstoffdynamik im Nareisboden und die Ertragsbildung von Reis (Oryza sativa L.) International Rice Research Institute
Diekmann, Karlheinz.
141 p.: ill. Thesis (Ph.D.) -- Justus Liebig Universitaet Giessen
Tipo: Thesis Palavras-chave: Rice; Green manures; Sesbania rostrata; Aeschynomene afraspera; Soil; Nitrogen content.
Ano: 1992 URL: http://hdl.handle.net/123456789/900
Imagem não selecionada

Imprime registro no formato completo
Evaluating nitrogen transfer efficiency of immobilized cyanobacteria to rice seedlings by 15N technique International Rice Research Institute
Balachandar, D.; Kumar, K.; Kannaiyan, S.; Arulmozhiselvan, K..
p.53-54
Palavras-chave: Cyanobacteria; Anabaena azollae; Nostoc muscorum; Immobilization; Nitrogen; Nitrogen content; Nutrient uptake; Urea.
Ano: 2004 URL: http://hdl.handle.net/123456789/773
Imagem não selecionada

Imprime registro no formato completo
Induced responses in the subtropical evergreen, broad-leaf tree Schima superba: Effects of simulated herbivory on leaf quality and subsequent insect attack during leaf expansion Phyton
Liu,ZG; Cai,YL; Li,K.
Induced responses to herbivory are physical, nutritional, and allelochemical traits that change in plants following disturbances, and reduce the performance and/or preference of leaf tissues on herbivores. This study gave evidence to the induced defense theory through the simulated herbivory in Schima superba, one of common dominant trees in subtropical evergreen, broadleaf forests in southern China. Results showed that leaves damaged at the beginning of leaf expansion would develop into having a larger area, higher toughness and higher tannin concentrations, but a lower water content compared with control leaves. As a result, they experienced lower herbivory rates than controls. These results indicate that simulated herbivory on leaves of S. superba (1)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Induced response; Herbivory; Simulated herbivory; Nitrogen content; Schima superba.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100012
Imagem não selecionada

Imprime registro no formato completo
Measurement of nitrogen content in rice by inversion of hyperspectral reflectance data from an unmanned aerial vehicle Ciência Rural
Wen,Du; Tongyu,Xu; Fenghua,Yu; Chunling,Chen.
ABSTRACT: The Nitrogen content of rice leaves has a significant effect on growth quality and crop yield. We proposed and demonstrated a non-invasive method for the quantitative inversion of rice nitrogen content based on hyperspectral remote sensing data collected by an unmanned aerial vehicle (UAV). Rice canopy albedo images were acquired by a hyperspectral imager onboard an M600-UAV platform. The radiation calibration method was then used to process these data and the reflectance of canopy leaves was acquired. Experimental validation was conducted using the rice field of Shenyang Agricultural University, which was classified into 4 fertilizer levels: zero nitrogen, low nitrogen, normal nitrogen, and high nitrogen. Gaussian process regression (GPR) was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: UAV; Hyperspectral remote sensing; Machine learning; Nitrogen content.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000600352
Imagem não selecionada

Imprime registro no formato completo
Multispectral remote sensing for site-specific nitrogen fertilizer management PAB
Bagheri,Nikrooz; Ahmadi,Hojjat; Alavipanah,Seyed Kazem; Omid,Mahmoud.
The objective of this work was to evaluate the use of multispectral remote sensing for site-specific nitrogen fertilizer management. Satellite imagery from the advanced spaceborne thermal emission and reflection radiometer (Aster) was acquired in a 23 ha corn-planted area in Iran. For the collection of field samples, a total of 53 pixels were selected by systematic randomized sampling. The total nitrogen content in corn leaf tissues in these pixels was evaluated. To predict corn canopy nitrogen content, different vegetation indices, such as normalized difference vegetation index (NDVI), soil-adjusted vegetation index (Savi), optimized soil-adjusted vegetation index (Osavi), modified chlorophyll absorption ratio index 2 (MCARI2), and modified triangle...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aster; Nitrogen content; Near infrared; Multispectral response; Precision agriculture; Vegetation indices.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013001000011
Imagem não selecionada

Imprime registro no formato completo
Nitrogen and potassium in the cultivation of Piatã grass in Brazilian Cerrado soil AGRIAMBI
Morais,Léa P. V. X. C. de; Bonfim-Silva,Edna M.; Pacheco,Adriano B.; Abreu,Joadil G. de; Silva,Tonny J. A. da; Polizel,Analy C..
ABSTRACT This study aimed to evaluate the production and mineral nutrition of Piatã grass as a function of nitrogen and potassium fertilization in Oxisol collected in the Cerrado. The experiment was carried out in a greenhouse, the experimental design was completely randomized, in a 5 x 5 factorial scheme, corresponding to five nitrogen doses (0, 100, 200, 300 and 400 mg dm-3 of N) and five potassium doses (0, 90, 180, 270 and 360 mg dm-3 of K2O), with four replicates. Three cuts of the shoots were performed every 30 days. Chlorophyll index, dry mass of shoots and roots, and nitrogen and potassium contents in the leaves were evaluated. The dry mass of shoots showed interaction between nitrogen and potassium in the three cuts; in the second and third cuts,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria brizantha; Nitrogen content; Potassium content; N:K ratio in plants.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001100984
Imagem não selecionada

Imprime registro no formato completo
Nitrogen dynamic in wheat (Triticum aestivum L.) agroecosystem as influenced by intra- and interspecific competition Planta Daninha
Asadi,Sara; Aynehband,Amir; Rahnama,Afrasyab.
Abstract Background: The study of both intra- and interspecific competitions in Wheat (Triticum aestivum L.) agroecosystem is quite complex and it is essential to understand the influence of nitrogen in these competitions. Objective: The aim of this study was to evaluate the effect of different competitive models on nitrogen balance in wheat ecosystem agriculture (Chamran cultivar). Methods: A field experiment was performed using split-plot based on randomized complete block design (RCBD) with three replications. The main and sub-plots consisted of different nitrogen rates (control, 50, 100 and 150 kg nitrogen ha-1) and different competitive patterns (no, intraspecific, interspecific competition and intra- and interspecific in combination) were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitrogen balance; Nitrogen content; NTE; Remobilization; Weed.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100332
Imagem não selecionada

Imprime registro no formato completo
Predatory behavior of mirid bug, Cyrthorhinus lividipennis, on rice plants with different nitrogen regimes International Rice Research Institute
Lu, Z. X.; Yu, X. P.; Hu, C..
p.38-40
Palavras-chave: Cyrthorhinus lividipennis; Predatory insects; Nitrogen content.
Ano: 2004 URL: http://hdl.handle.net/123456789/989
Imagem não selecionada

Imprime registro no formato completo
Queda de litter e manta orgânica e teor de nitogênio (N) em um sistema agrossilvipastoril em Sobral. Repositório Alice
FERNANDES, J. A. B.; CARVALHO, F. C. de; ARAUJO FILHO, J. A. de; CAMPANHA, M. M.; DUTRA, L. A..
Resumos: A manta orgânica é resultado da queda e acumulação do litter, material vegetal que cai no solo em um ambiente florestal. Este processo é de fundamental importância para a circulação dos elementos minerais dentro do ecossistema. Durante a decomposição da manta orgânica ocorre liberação dos nutrientes minerais contidos nesta, tornando-os disponíveis, no meio edáfico, para a vegetação.Objetivou-se quantificar a queda e deposição do Litter e manta orgânica e avaliar a ciclagem de N a partir dos mesmos, em um sistema agrossilvipastoril. Conduzido no período de agosto de 2001 a julho de 2002, na Embrapa Caprinos, Sobral-CE, com médias pluviométricas de 1002,5 e 905,3 mm respectivamente. Foram avaliados três tratamentos no sistema agrossilvipastoril...
Tipo: Anais e Proceedings de eventos Palavras-chave: Sistema agrossilvipastoril; Ciclagem de nutriente; Manta orgânica; Código florestal; Teor de nitrogênio; Brasil; Ceará; Sobral; Agrosilvopastoral systems.; Caatinga.; Nitrogen content; Brazil; Semiarid soils; Silvopastoral systems..
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/534515
Imagem não selecionada

Imprime registro no formato completo
Response of Dalbergia miscolobium Benth. seedlings, a cerrado tree species, to mineral nutrient supply Rev. Bras. Bot.
Sassaki,Regina M.; Felippe,G.M..
(Response of Dalbergia miscolobium Benth. seedlings, a cerrado tree species, to a mineral nutrient supply). The soil under the Brazilian cerrado vegetation is very poor in nutrients. The aim of this study was to investigate the effect of the addition of a nutrient solution in the early growth of D. miscolobium, a typical cerrado tree species, cultivated in cerrado soil. Seeds were germinated in Petri dishes and seven-day old seedlings were transfered to pots containing cerrado soil. These were supplied once a week with a normal, 1/2 or 1/10 strength nutrient solution. Four growth analysis were done over a period of 145 days from seed imbibition, in terms of dry mass, leaf area and carbohydrate and nitrogen contents. Other derived parameters were also...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dalbergia miscolobium; Carbohydrate content; Nitrogen content; Early growth; Nutrient solution.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041998000100006
Imagem não selecionada

Imprime registro no formato completo
Studies on the behavior of nitrogen absorbed at different stages of growth of the rice plant (Oryza sativa L.) in relation to grain production International Rice Research Institute
Garcia, Consolacion V..
110 leaves : ill. Thesis (M.S.) -- University of the Philippines
Tipo: Thesis Palavras-chave: Rice; Plant Physiology; Nitrogen'; Nitrogen content; Developmental stages.
Ano: 1966 URL: http://hdl.handle.net/123456789/478
Imagem não selecionada

Imprime registro no formato completo
การใช้ปอเทืองเป็นปุ๋ยพืชสดที่มีต่อผลผลิต องค์ประกอบผลผลิต และปริมาณไนโตรเจนของข้าวสังข์หยดพัทลุง Thai Agricultural
Somporn Kamyot.
The research objectives were to investigate green manure species namely Crotalaria juncia on yield, yield components and nitrogen content of rice cv. Sangyodphatthalung was conducted in paddy soil condition of Phatthalung Soil Series. The experimental design was RCBD of which consisted of 7 treatments by using different seed rates (kg rai-1) as compared to chemical fertilizer i.e. 0, 5, 10, 15, 20, 25 and 8-10-0 kg N-P2O5-K2O rai-1. The results of yield showed that significantly different with different seed rates, the treatment of 15, 20, 25 kg rai-1 and CF gave similar highest average yield (386.8, 388.9, 385.7, 409.5 kg rai-1 respectively) and highest average number of no. of panicle hill-1, no. of spikelet panicle-1 and % of filled grain whereas the N...
Tipo: Collection Palavras-chave: Rice; Sangyodphatthalung rice; Green manure; Yield; Yield component; Nitrogen content; ข้าว; พันธุ์สังข์หยดพัทลุง; ปอเทือง; ปุ๋ยพืชสด; ผลผลิต; องค์ประกอบผลผลิต; ปริมาณไนโตรเจน.
Ano: 2012 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5373
Imagem não selecionada

Imprime registro no formato completo
マニュアスプレッダで散布された堆肥の散布量と窒素投入量の圃場内分布 OAK
申, 宝明; 佐藤, 禎稔; 加藤, 拓; 谷, 昌幸; 岸本, 正; SHEN, Baoming; SATOW, Tadatoshi; KATO, Taku; TANI, Masayuki; KISHIMOTO, Tadashi.
マニュアスプレッダで散布された堆肥の乾物質量と窒素投入量の圃場内分布を評価するために,3つの 圃場で散布試験を実施した。供試堆肥の含水率は平均で53~81%と圃場ごとに大きな差異が見られ,その 変動係数はB とC 圃場が4.6%以内であったのに対し,A 圃場は9.4%以上とばらつきが大きかった。バー ク堆肥の窒素含有量は牛ふん堆肥に比べると少なく,その平均はA 圃場で14.7g/kg, C 圃場で16.8g/kg であった。圃場全体の堆肥の散布量と窒素投入量の変動係数はいずれの圃場でも49%以上とばらつきが大 きかった。しかし,堆肥の含水率の変動が少ない圃場では,堆肥の現物質量と窒素投入量の分布形状がほ ぼ一致することから,圃場内の窒素投入量を均一にするためには,堆肥水分のばらつきを少なくし,かつ 堆肥散布精度を向上させることが必要であると考える。 In order to evaluate distribution variability of the dry weight and the amount of nitrogen input of the compost applied with manure spreaders, the experiments of compost application were carried out in three fields. The mean values of compost moisture content at three experimental fields range from 53 to 81%, and their differences between three fields were significant. The...
Palavras-chave: 堆肥散布機; 散布量分布; 窒素含有量; バーク堆肥; 牛ふん堆肥; Manure spreader; Distribution map; Nitrogen content; Bark compost; Cattle compost.
Ano: 2011 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3067
Imagem não selecionada

Imprime registro no formato completo
利用葉綠素測計估測水稻植株葉綠素及氮素 Taiwan Agricultural Research Institute
楊純明; Chwen-Ming Yang.
[[abstract]]本文研究在行政院農委會農業試驗所農場(臺中縣霧峰鄉)進行,調查2000年二期稻作至2002年一期稻作(二年四期作)之水稻生育期間稻株葉片葉綠素總量與氮素含量及葉綠素測計讀值,分析葉綠素與氮素含量關係,再釐清是否可以利用葉綠素測計讀值估測葉綠素及氮素之變化,並比較期作間差異。根據試驗結果,發現葉片之葉綠素總量、氮素含量或葉綠素測計讀值均隨著稻株生育進展而呈現下降趨勢,此一表現不受本試驗不同等級氮肥施用量之影響。續將稻株葉片之氮素含量與葉綠素總量進行相關分析,發現一、二期稻作皆可以直線正相關表示兩變數的關係,且由於兩期稻作資料經虛擬變數檢定為不顯著,乃進一步將兩期作資料合併分析,兩變數之間仍為顯著直線正相關 (R2=0.615, P<0.0001)。又試驗分析亦顯示,稻株葉片之葉綠素總量與葉綠素測計讀值之關係十分密切,可適用於直線相關,一、二期稻作之決定係數 (R2) 分別為0.758及0.862。兩期作資料經虛擬變數檢定為不顯著,其合併分析亦顯示兩變數間為顯著直線正相關 (R2=0.784, P<0.0001)。基於前述二項分析,乃將葉片氮素含量與葉綠素測計讀值進行相關分析,發現兩者在統計上無論期作均為顯著直線正相關,一、二期稻作之決定係數分別為0.574及0.439,並且可以合併分析產生兩期稻作共用之迴歸方程式 (R2=0.411, P<0.0001)。綜合試驗結果,在本研究採用之水稻品種臺農67號,建議可以利用葉綠素測計讀值推估稻株葉片之葉綠素與氮素含量,此一功能在氮肥管理上具有應用意義。
Palavras-chave: 水稻 葉綠素測計 葉綠素總量 氮素含量 氮肥管理 Rice; Chlorophyll meter; Total chlorophyll; Nitrogen content; Nitrogen fertilizer management [[classification]]6.
Ano: 2003
Registros recuperados: 21
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional