Índice SPAD para o diagnóstico do estado de nitrogênio na cultura do pepino japonês em ambiente protegido

Pôrto, Mônica Lima Alves; Puiatti, Mário; Fontes, Paulo Cesar R.; Cecon, Paulo Roberto; Alves, Jailson C

doi:10.1590/s0102-05362014000300009

Cited by 14 publications

(11 citation statements)

References 14 publications

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“…A quadratic trend was observed, with a peak at 121.37 kg ha -1 and a SPAD index value of 39.8 (Fig 2). The results corroborate the findings of other authors for pumpkin (Swader and Moore, 2002), muskmelon (Azia and Stewart 2001), cucumber (Pôrto et al, 2014), zucchini (Pôrto et al, 2011), radish (Caetano et al, 2015) and cabbage (Nascimento et al, (2017), which also exhibited increased relative chlorophyll index values in their leaves with increased doses of N. According to Fontes and Araujo (2007), N is a macronutrient involved in the synthesis and the structure of the chlorophyll molecules; thus, to a certain level, the increase in the N supply available to plants promotes an increase in the relative chlorophyll index and produces a more intense green colour in the plant's leaves. The interactions between management with and without pruning and the N doses had significant effects on the relative chlorophyll index at 50 days ( Fig 1C).…”

Section: Development and Production Componentssupporting

confidence: 92%

“…. According to Trani and Raij (1996), the N content was within the range ideal for a cucumber crop, i.e., between 45 and 60 g kg -1 (leaf dry mass), indicating that the plants had an appropriate amount of N. The values found in this work are close to those reported by Pôrto et al (2014) for a cucumber crop and Azambuja et al (2015) and Pôrto et al (2011) for a zucchini crop. The N doses significantly influenced the relative chlorophyll index of the cucumber plants at 35 DAE, resulting in a value of 35 ( Fig 1B).…”

Section: Development and Production Componentssupporting

confidence: 85%

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Nitrogen fertilization and different crop management practices in pickling cucumber (Cucumis sativus L.)

Souza¹,

Borges²,

Benett³

et al. 2018

Aust J Crop Sci

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The use of nitrogen (N) fertilization has been shown to increase the quality and production of cucumber. Thus, the goal of this work was to evaluate crop management practices with and without shoot pruning and the application of N in a pickling cucumber crop under greenhouse conditions. The experiment was conducted in a greenhouse at the Goiano Federal Institute, Urutaí Campus. The experimental design involved randomized blocks in a 2×5 factorial arrangement, with two different management treatments (with and without pruning) and five doses of N (0, 50, 100, 150 and 200 kg ha -1 N), with four replicates. The doses of N were split among three applications at 15, 30 and 45 days after plant emergence. Each plot contained ten plants with a 0.2-m spacing between plants and a 0.8-m spacing between rows. The four central plants in each plot were evaluated, and the following assessments were performed: leaf N content, relative chlorophyll index, stem diameter, fruit length, fruit diameter, number of fruits, fruit fresh mass, fruit dry mass, shoot fresh mass, production per plant and total yield. The data were subjected to analysis of variance (F test) at the 5% probability level, and when significant effects were observed for the N doses, regression analyses were performed. Management with and without pruning directly influenced the production of pickling cucumber. The doses of N influenced the development and yield of cucumber under greenhouse conditions.

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Section: Development and Production Componentssupporting

confidence: 92%

Section: Development and Production Componentssupporting

confidence: 85%

Nitrogen fertilization and different crop management practices in pickling cucumber (Cucumis sativus L.)

Souza¹,

Borges²,

Benett³

et al. 2018

Aust J Crop Sci

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“…Portanto, o teor de clorofila correlaciona-se com a concentração de N na planta e, de modo geral, com a produtividade das culturas (Silva et al, 2012). Em hortaliças, como pepino japonês (Pôrto et al, 2014) e abobrinha (Pôrto et al, 2011), o índice SPAD mostrou correlação positiva com o teor de N na folha e, consequentemente, com a produtividade de frutos. No presente trabalho, a diminuição dos valores de índice SPAD Tabela 1.…”

Section: Resultsunclassified

Desempenho da taioba cultivada sob diferentes materiais de cobertura

Colombo

Puiatti

Altoé

et al. 2018

Agraria

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AGRONOMIA (AGRONOMY) RESUMO: O trabalho teve por objetivo avaliar o desempenho de plantas de taioba submetidas a restrição de luz por diferentes materiais de cobertura. Os tratamentos consistiram de cinco ambientes de cultivo: 1-cultivo a céu aberto (controle); 2-cultivo sob tela sombrite ® preta 30%; 3-cultivo sob tela sombrite ® preta 50%; 4-cultivo sob filme agrícola de 150 µ e 5-cultivo sob tela antigranizo preto 18%. Os ambientes telados tinham pé direito de 2,5 m e largura de 2,0 m contendo duas fileiras espaçadas de 1,0 m cada e as plantas espaçadas de 0,5 m. Utilizou-se o delineamento experimental de blocos casualizados, com oito repetições. Foram avaliadas características de parte aérea e subterrânea e determinado o índice SPAD. Melhores resultados de características de parte aérea e subterrânea foram obtidos em plantas cultivadas sob a tela antigranizo 18%, sem diferir da tela sombrite ® 50%. Nesses ambientes também foram registrados os maiores valores de índice SPAD evidenciando que esse índice pode ser um bom indicativo do estado N das plantas e de produtividade de folhas e de rizomas. A utilização da tela antigranizo 18% e da tela sombrite ® 50%, nessa ordem de preferência, são indicadas para cobertura das plantas de taioba. Palavras-chave: filme plástico; restrição de luz; tela antigranizo; tela de sombreamento; Xanthosoma saggitifolium Cocyam performance cultivated under different roofing materials ABSTRACT: The study aimed to evaluate the performance of cocoyam grown under differents roofing materials. The treatments consisted in the cultivation of tannia under five different environments: 1-no shading (control); 2-shade screen of 30%; 3-shade screen of 50%; 4-agricultural film of 150 µ and 5-anti-hail screen 18%. We used the experimental randomized block design with eight replications. Were evaluated aerial and underground part characteristics and determined the SPAD index. Best results of aerial and underground parts of characteristics were obtained in plants grown under anti-hail screen 18%, without differ from the shade screen of 50%. In such environments, the highest SPAD index values were also recorded showing that the content can be a good indication of the state of nitrogen plants and productivity of rhizomes and leaves. The use of anti-hail screen 18% and shade screen of 50%, in this order of preference, are indicated for coverage of the taioba plants.

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“…In Brazil, cucumber (Cucumis sativus L.) is intensively cultivated in greenhouse, especially the Japanese type cultivars. The use of this cultivation system has resulted in great benefits, especially for small and medium farmers, such as increased of fruits yield and quality, reduction of seasonality of production and a significant increase in profitability (Santi et al, 2013;Pôrto et al, 2014a).…”

Section: Introductionmentioning

confidence: 99%

N Sources and Doses on Japonese Cucumber Yield and Nitrate Accumulation in Fruits in Greenhouse

Pôrto¹,

Puiati²,

Fontes³

et al. 2018

JAS

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Despite Japanese cucumber nutritional and commercial importance, few studies have been carried out with the nitrogen (N) fertilization of the crop, especially in greenhouse conditions. This study objective was to evaluate the Japanese cucumber yield and nitrate (NO3-) accumulation in the fruits in greenhouse as a function of the N sources and doses at Viçosa, Minas Gerais State, Brazil. The experiment was set in a randomized complete block design, arranged in a 2 × 5 factorial scheme, with two N sources (ammonium sulphate and ammonium nitrate) and five N doses (0; 75; 150; 300 and 600 kg ha-1), with four replicates. The number of fruits per plant, average fruit mass, fruits yield and NO3- accumulation in the fruits were evaluated. The maximum economic efficiency N doses for two N sources used was calculated according to the prices of the fertilizers and Japanese cucumber fruits practiced in 2010. There were no significant effects of N sources and of the interaction between N sources and N doses for the productive characteristics (number of fruits per plant, average fruit mass and fruits yield) of the Japanese cucumber. However, all the productive characteristics of the Japanese cucumber increased following a quadratic model as a function of the N doses. The maximum economic efficiency N doses for the fruits yield of Japanese cucumber were 398 kg ha-1 and 386 kg ha-1, resulting in fruits yield of 76.38 t ha-1 and 76.29 t ha-1, for the ammonium sulphate and ammonium nitrate, respectively. NO3- accumulation in Japanese cucumber fruits as a function of the N doses for two N sources evaluated was not verified.

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Índice SPAD para o diagnóstico do estado de nitrogênio na cultura do pepino japonês em ambiente protegido

Cited by 14 publications

References 14 publications

Nitrogen fertilization and different crop management practices in pickling cucumber (Cucumis sativus L.)

Nitrogen fertilization and different crop management practices in pickling cucumber (Cucumis sativus L.)

Desempenho da taioba cultivada sob diferentes materiais de cobertura

N Sources and Doses on Japonese Cucumber Yield and Nitrate Accumulation in Fruits in Greenhouse

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