|
|
|
| Registros recuperados: 22 | |
|
|
| Lorensini, Felipe; Ceretta, Carlos Alberto; Lourenzi, Cledimar Rogério; De Conti, Lessandro; Tiecher, Tadeu Luis; Trentin, Gustavo; Brunetto, Gustavo. |
| Grapevines grown on sandy soils are subjected to the application of supplemental nitrogen (N); however, there is little information available regarding the impact of these applications on yield, plant nutritional state and must composition. The aim of this study was to evaluate the yield, nutritional state and must composition of grapevines subjected to N fertilization. Cabernet Sauvignon grapevines were subjected to annual applications of 0, 10, 15, 20, 40, 80 and 120 kg N ha-1 in 2008, 2009 and 2010. During the 2008/09, 2009/10 and 2010/11 harvest seasons, leaves were collected during full flowering and when the berries changed color, and the total N content was analyzed. The grape yield and the enological characteristics of the must were evaluated. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.00.00.00-4 5.01.00.00-9 5.01.01.00-5 urea; Leaf analysis; Yield components; Vitis vinifera 5.01.01.05-6 urea; Leaf analysis; Yield components; Vitis vinifera 5.01.01.05-6. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19354 |
| |
|
|
| Álvarez,Carlos E; Fernández-Falcón,Marino; Hernández,M. Mercedes. |
| Two cultivars ('Succession II' and 'Tango') of Leucospermum cordifolium were studied over three years in commercial plantations with optimum yields located on subtropical La Palma Island (Canarian Archipelago). Four foliar samplings were taken per year to determine the evolution of the N, P, and K contents over time and to determine the optimal month for foliar standard sampling. Foliar chlorophyll activity and the foliar standard concentrations of macro- and micronutrients were determined. Soil samples were also taken. Both cultivars developed well in soils with acid and slightly acid pH, low and high organic matter content, and in some cases, high available P concentrations, though Proteaceae is generally considered P sensitive. Chlorophyll activity... |
| Tipo: Journal article |
Palavras-chave: Leaf analysis; Protea; 'Succession II'; 'Tango'. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100008 |
| |
|
|
| Brunetto,Gustavo; Cella,Cesar; Miotto,Alcione; Girotto,Eduardo; Lorensini,Felipe; Brackmann,Auri; Ceretta,Carlos Alberto; Schorr,Márcio Renan Weber; Both,Vanderlei; Ambrosini,Vítor Gabriel. |
| ABSTRACT: Little is known about the impact of N fertilization on fruit production and composition in orange groves grown in soils with low or medium organic matter content in Rio Grande do Sul (RS). This study aimed to evaluate how N fertilization of orange trees cv. 'Lane Late' in a sandy soil may interfere in fruit yield and composition of fruit and juice. The experiment was conducted with orange trees cv. 'Lane Late' growing in Sandy Typic Hapludalf soil, in Rosário do Sul (RS). The plants received applications of 0, 20, 40, 60, 80, 100, 120, 140 and 160kg N ha-1. Total N in leaves, number of fruits per plant, yield, fresh weight, fruit diameter, peel thickness, percentage of fruit juice, peel color, juice color, ascorbic acid content, total soluble... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen; Leaf analysis; Fruit quality; Citrus sinensis L. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300253 |
| |
|
|
| Sánchez,Esteban; Soto-Parra,Juan Manuel; Preciado-Rangel,Pablo; Llanderal,Alfonso; Lao,María Teresa. |
| ABSTRACT The objective of this study was to compute and compare DRIS norms for grafted and non-grafted red bell pepper crops grown in semi arid climate conditions. DRIS norms were computed with 84 samples of first young mature leaves collected during developed stage. The experiment had a completely randomized block design, and the values obtained for each plant and each variable were considered as independent replicates. Thirty-two DRIS norms nutrient ratios and coefficients of variation (CV) were computed from N, P, K, Ca, Mg, Fe, Cu, Zn and Mn analytical results. The ratios P/N and K/N in grafted and non-grafted pepper plants, showed low CV and therefore may play a fundamental role in crop production according with the DRIS norms calculated, since as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum; Diagnostic and Recommendation Integrated System; Foliar diagnostic; Leaf analysis; Nutrient ratio; Macronutrients. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000300371 |
| |
|
| |
|
|
| SOBRAL, L. F.; SANTOS, Z. G. dos. |
| Base de utilização da análise foliar para recomendar fertilizantes, nível critico, interações, amostragem das folhas para análises, base teórica da amostragem, limitações práticas, folha a ser amostrada, filotaxia do coqueiro, métodos práticos para reconhecimento da folha a ser mostrada, coleta, identificação e preparação da amostra, métodos a serem utilizados na análise, fatores envolvidos na iterpretação dos resultados. |
| Tipo: Folhetos |
Palavras-chave: Coqueiro; Coconut; Leaf analysis; Adubação; Análise Foliar; Cocos Nucifera; Cultivo Perene; Nutrition. |
| Ano: 1987 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/355693 |
| |
|
| |
|
| |
|
|
| SOBRAL, L. F.. |
| Durante os meses de novembro de 1986 a fevereiro de 1987, foram efetuadas coletas de amostras de folha e solo em 26 propriedades dos litorais Norte de Sul de Sergipe. Nas propriedades, foram escolhidas areas uniformes e representativas de onde foram coletadas 35 amostras da folha 14. Cada amostra constou de 10 plantas. Observou-se que 82,9% das amostras da folha apresentaram teor de N< 1,8%, portanto deficientes. Embora o teor de P no solo fosse baixo (82,8% dos casos), apenas, 34, 3% das amostras da folha apresentaram teor de P< 0,120 %. Em 65,7% das msotras, o potassio foi deficiente. Confirmando os baixos teores de calcio do solo, 40,0% das amostras da folha apresentaram-se abaixo de 0,300% enquanto que nenhuma amostra mostrou-se abaixo do valor... |
| Tipo: Folhetos |
Palavras-chave: Coqueiro; Coconut; Leaf analysis; Brasil; Sergipe; Adubação Foliar; Cocos Nucifera; Cultivo Perene; Nutrição; Plant nutrition. |
| Ano: 1989 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/357089 |
| |
|
| |
|
|
| FONTES,PAULO CEZAR REZENDE; SAMPAIO,REGYNALDO ARRUDA; MANTOVANI,EVERARDO CHARTUNI. |
| Tomato (Lycopersicon esculentum Mill.) cv. Santa Clara was grown on a silt clay soil with 46 mg dm-3 Mehlich 1 extractable K, to evaluate the effects of trickle-applied K rates on fruit yield and to establish K critical concentrations in soil and in plant petioles. Six potassium rates (0, 48, 119, 189, 259 and 400 kg ha-1 K) were applied in a randomized complete block design with four replications. Soil and plant K critical levels were determined at two plant growth stages (at the beginning of the second and fourth cluster flowering). Total, marketable and weighted yields increased with K rates, reaching their maximum of 86.4, 73.4, and 54.9 ton ha-1 at 198, 194, and 125 kg ha-1 K , respectively. At the first soil sampling date K critical concentrations in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lycopersicon esculentum; Optimum rate; Leaf analysis; Soil analysis. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000000300013 |
| |
|
| |
|
|
| Maia,Celsemy Eleutério; Morais,Elis Regina Costa de. |
| ABSTRACT: The boundary line is a method frequently used to assess the nutritional status of plants when the relationship between the variables under analysis is influenced by other interacting factors. The objective of this study was to propose and test the boundary line model to estimate the nutrient sufficiency range and nutritional status of irrigated muskmelon. The lower and upper limits of the sufficiency range were calculated as a basis for assessment of the nutritional status of muskmelon. Leaf material was collected from 70 muskmelon crop areas in northern Brazil. The nutrient (N, P, K, Ca, Mg, S, Fe, Zn, Mn, B, and Cu) concentrations in the leaf tissue and the respective fruit yield of each area were measured. The proposed model to estimate the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Nutritional evaluation; Leaf analysis. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100553 |
| |
|
| |
|
|
| NAVA,GILBERTO; CIOTTA,MARLISE NARA; BRUNETTO,GUSTAVO. |
| ABSTRACT The aim of this work was to evaluate the effects of orchard fertilization with increasing rates of phosphorus (P) on yield and critical levels of P in the soil and in the leaf of ‘Fuji’ apple trees. The experiment was conducted in São Joaquim, state of Santa Catarina, southern Brazil, from 2010 to 2015, in an Inceptisol soil. The three apple orchards were planted in 2004 with the Fuji cultivar grafted on Marubakaido/ M9 rootstock and grown under a high-plant-density system (1984 trees ha-1). Annual fertilizer levels of 0, 40, 80, 120 and 160 kg ha-1 of P2O5 (as triple superphosphate) were applied to the soil surface, without incorporation, in a randomized block design with five replicates. In the first and last years (2011 and 2015), soil samples... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malus domestica Borkh; Yield; Critical level; Leaf analysis. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000103001 |
| |
|
| |
|
|
| Brunetto,Gustavo; Ceretta,Carlos Alberto; Melo,George Wellington Bastos de; Girotto,Eduardo; Ferreira,Paulo Ademar Avelar. |
| This study was carried out to evaluate the yield, total N content in leaves and must composition of grapes from the Cabernet Sauvignon variety subjected to the application of urea and organic compost. Cabernet Sauvignon grapevines in Rosário do Sul, RS, Brazil, in 2008, 2009 and 2010 were subjected to annual application of 40 kg N ha-1 in the form of organic compost and urea, and compared to unfertilized grapevines. In the 2008/09, 2009/10 and 2010/11 crop seasons, leaves were collected for analysis of total N content. At maturation of the grapes, the yield and quality attributes of the must were evaluated. The application of N sources, especially organic compost, increased the N content in the whole leaf at full flowering. Application of organic compost... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urea; Organic compost; Leaf analysis; Must quality; Vitis vinifera. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452013000400015 |
| |
|
|
| Lucas,Dioneia Daiane Pitol; Heldwein,Arno Bernardo; Hinnah,Fernando Dill; Maldaner,Ivan Carlos; Loose,Luis Henrique. |
| The aim of this study was to obtain a mathematical model for estimating the leaf area index (LAI) of a sunflower crop as a function of accumulated thermal time. Generating the models and testing their coefficients was carried out using data obtained from experiments carried out for different sowing dates in the crop years of 2007/08, 2008/09, 2009/10 and 2010/11 with two sunflower hybrids, Aguará 03 and Hélio 358. Linear leaf dimensions were used for the non-destructive measurement of the leaf area, and thermal time was used to quantify the biological time. With the data for accumulated thermal time (TTa) and LAI known for any one day after emergence, mathematical models were generated for estimating the LAI. The following models were obtained, as they... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus; Leaf analysis; Modelling. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000200404 |
| |
|
|
| Ruschel,Jonas; Carmello,Quirino Augusto de Camargo; Bernardi,Alberto Carlos de Campos; Carvalho,Sérgio Alves de; Mattos Jr.,Dirceu. |
| Analysis of leaf nutrient contents can demonstrate plant nutritional status, identify symptoms of deficiency and toxicity, and evaluate the need to adjust fertilization programs. This research determined N:P:K:Ca:S rates for optimal nutrition of Rangpur lime - RL (Citrus limonia Osb.) rootstock, in an experiment arranged in a fractional factorial design of the (¹/25) 5(4) type, with 25 treatments distributed within five blocks. Seedlings of RL were transplanted into 3.8-dm³ containers filled with commercial growing media, when plant height = 10 cm, in a nursery. Treatments consisted of the following nutrient rates (g per plant): N = 0.31, 0.62, 1.25, 2.5 and 5; K = 0.4, 0.62, 1.25, 2.5 and 5; P = 0.35, 1.0, 2.0, 3.0 and 4.0; and Ca = 3.5, 5.0, 6.0, 7.0 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus limonia; Mineral nutrition; Leaf analysis; Response surface. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500007 |
| |
|
|
| Nogueira,N. de L.; Rodrigues,J.C.V.; Cabral,C.P.; Prates,H.S.. |
| Citrus leprosis is the main viral disease affecting citrus in Brazil. Viral diseases can affect the mineral composition of citrus leaves, inducing mineral deficiencies. The aim of this work was to verify the influence of citrus leprosis on the mineral composition of citrus leaves, cultivar Pera. Orange seedlings were grown in pots containing sterile soil, and kept under greenhouse conditions. When plants had 15 to 20 leaves, they were infested with the mite Brevipalpus phoenicis, the leprosis vector, collected from infected citrus plants. Other plants were not infested, and were used as the control. Ninety days after infestation, all the infested plants presented leprosis lesions. The six upper leaves of each plant were collected and the determination of... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Citrus; Leprosis; Mineral composition; Leaf analysis. |
| Ano: 1996 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200026 |
| |
| Registros recuperados: 22 | |
|
|
|
