Curva crítica de diluição do nitrogênio para a cultura do melão

Fogaça, Marco Aurélio de Freitas; Andriolo, Jerônimo Luiz; Godoi, Rodrigo dos Santos; Barros, Cláudia Alessandra Peixoto de; Janisch, Djeimi Isabel; Vaz, Marcos André Braz

doi:10.1590/s0103-84782008000200008

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…Apesar das aplicações semelhantes de N, aos 26 DAS ocorreu a maior disponibilidade na área Sumidouro e a menor na Bismarck. Aos 38 DAS, a diminuição acentuada da disponibilidade na área Sumidouro é atribuída ao crescimento vegetativo das plantas, especialmente da área foliar (Fogaça et al, 2008), e às perdas de N do solo, pois as plantas de meloeiro fertirrigado aproveitariam apenas 40 a 60% do N aplicado, segundo Holanda et al (2008). Na mesma data, observou-se a disponibilidade máxima de N na área Bismarck, coincidindo com a fase de floração, o que pode ser uma das causas da grande diferença em produtividade entre as áreas.…”

Section: Resultsunclassified

Produtividade de frutos e teores de nutrientes no solo durante um cultivo de meloeiro

Calegari

Souza²,

Miranda

et al. 2012

Agraria

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Produtividade de frutos e teores de nutrientes no solo durante um cultivo de meloeiro RESUMOEm duas áreas comerciais de melão 'Iracema' fertirrigado, em Baraúna, RN, foram monitoradas, durante um ciclo vegetativo da cultura, a dinâmica de nitrogênio, fósforo e potássio e a variação de seus teores no solo, a qual foi correlacionada com a produtividade de frutos para identificar a deficiência ou excesso destes nutrientes. Para isto, utilizou-se uma malha de amostragem com quarenta parcelas, onde as coletas de solo ocorreram aos 10, 26, 38, 51 e 64 dias após semeadura, para determinar os teores de N total, P e K, e as produções dos tipos de exportação, mercado nacional e comerciável. As variáveis de produção de frutos e os teores no solo de nitrogênio total, fósforo e potássio, nas cinco épocas de amostragem, foram analisados por meio da estatística descritiva e análise de correlação. A variação dos teores de nutrientes, em relação ao estágio de desenvolvimento das plantas, indicou aplicação em excesso. Correlações negativas com os frutos tipo exportação e positivas com frutos tipo mercado nacional foram obtidas na época em que os teores de N total foram mais elevados. Correlações negativas com frutos tipo mercado nacional, e positivas com frutos tipo exportação, foram obtidas quando os teores de P foram mais elevados do início para o meio do ciclo. Altos teores iniciais de K influenciaram negativamente a produção de frutos dos tipos mercado nacional e comerciável.Palavras-chave: Balanço de nutrientes, Cucumis melo L., fertirrigação. Fruit yield and nutrient contents in the soil during melon production ABSTRACTIn two commercial areas of fertirrigated 'Iracema' melon, in Baraúna, Rio Grande do Norte, Brazil, the dynamics of nitrogen, phosphorus and potassium, and the variation of their soil contents, was monitored during one crop vegetative cycle, in order to correlate the soil nutrient variation with melon fruit yield, and identify nutrient deficit or excess. To accomplish this task, sampling followed a grid with forty plots, where the soil samplings occurred 10, 26, 38, 51 and 64 days after sowing, in order to determine the soil contents of total N, P and K, and of the yields of the export types, domestic and commercial market. Fruit yield variables, as well as the soil contents of total nitrogen, phosphorus and potassium, on the five sampling times, were analyzed through the descriptive statistics and correlation analysis. Application in excess was indicated by the nutrient content variation in relation to the crop growth stage. Negative correlations with the export type fruits, and positive correlations with the domestic market fruits, were obtained on the time where total N contents were higher. In times where P contents were higher in the beginning to the middle cycle, negative correlations were obtained with the domestic market type fruits and positive with the export type fruits. High initial K contents had negative influence on the domestic and commercial market type production.

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Section: Resultsunclassified

Produtividade de frutos e teores de nutrientes no solo durante um cultivo de meloeiro

Calegari

Souza²,

Miranda

et al. 2012

Agraria

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“…Reduced N concentrations in the aboveground dry matter due to biomass increases and tissue aging was also observed for corn (Ziadi et al, 2008;Plénet and Lemaire, 2000), cotton (Xiaoping et al, 2007), potato (Andriolo et al, 2006;Bélanger et al, 2001), melon (Fogaça et al, 2008), and wheat (Justes et al, 1994). However, only a few studies have evaluated this phenomenon in sugarcane.…”

Section: Nitrogen Concentrationmentioning

confidence: 96%

Determining a critical nitrogen dilution curve for sugarcane

Oliveira

Gava

Trivelin³

et al. 2013

Z. Pflanzenernähr. Bodenk.

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Adequate measurements of the nitrogen (N) concentration in the aboveground biomass of sugarcane throughout the growth cycle can be obtained using the critical N dilution curve (CNDC) concept, which provides an N-nutrition index (NNI). The aim of this work was to determine the CNDC value for Brazilian sugarcane variety SP81-3250, establish the critical concentration of N, and determine the NNI in the aboveground biomass throughout the cane plant and first ratoon crop cycles. The study was performed in three experimental areas located in São Paulo, Brazil, during the crop cycles of 2005/2006 (18-month cane plant) and 2006/2007 (first ratoon). The plant cane crop was fertilized with treatments of 40, 80, or 120 kg N ha -1 and a control treatment without N. After the plant cane harvest, rates of 0, 50, 100, or 150 kg N ha -1 were applied to the control plot and the 120 kg N ha -1 -treatment plot in a split-plot experimental design with four repetitions. Throughout both sugarcane cycles, measurements of aboveground biomass were used to determine the dry-mass (DM) production and N concentration for each treatment. CNDC varied between the growth cycles, with a higher N concentration observed in the initial stages of the first ratoon and a lower N dilution observed throughout the plant cane cycle. The NNI value indicated excessive N storage in the initial stages and limiting concentrations at the end of the growth cycle. CNDC and NNI allow for the identification of the N-nutrition variation rate and the period in which the nutrient concentration limits the production of aboveground biomass. The equations for the critical N (Ncr) level obtained in this study for plant cane (Ncr = 19.0 DM -0.369 ) and ratoons (Ncr = 20.3 DM -0.469 ) can potentially be used as N-nutritional diagnostic parameters for sugarcane N nutrition.

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“…A redução na concentração do N na matéria seca da parte aérea com o aumento da fitomassa e com o envelhecimento dos tecidos, também foi observada para o milho (ZIADI et al, 2008;PLÉNET;LEMAIRE, 2000), na batata (ANDRIOLO et al, 2006;BÉLANGER et al, 2001), no melão (FOGAÇA et al, 2008) e no trigo (JUSTES et al, 1994). Na cana-de-açúcar poucos trabalhos foram desenvolvidos objetivando essa avaliação.…”

Section: Concentração De Nitrogêniounclassified

“…A introdução deste conceito tem como objetivo obter uma referência estatisticamente fundamentada (JUSTES et al, 1994), da concentração crítica de N em qualquer fase de crescimento e nos diferentes ambientes de produção, o que permite a capacidade de identificar o estado nutricional da cultura em condições supra ótima (excesso) ou sub ótima A CDCN foi inicialmente utilizada de maneira generalizada para dois grupos de espécies dos ciclos C 3 e C 4 (GREENWOOD et al, 1990). Posteriormente foi separadamente implementada e validada em condições edafoclimáticas distintas e em diferentes culturas, como o trigo de inverno e o milho (ZAIDI et al, 2010(ZAIDI et al, , 2008 no Canadá, para o algodão (XIAOPING et al, 2008) na China, na cultura do melão (FOGAÇA et al, 2008) e na batata (ADRIOLO et al, 2006) no Brasil; para o Azevém (MARINO et al, 2004) na Argentina, no tomateiro (TEI et al, 2002) na Itália e em diferentes espécies forrageiras (LAMAIRE; SALETTE, 1984) na França.…”

Section: Introductionunclassified

Balanço nutricional da cana-de-açucar relacionado à adubação nitrogenada

Oliveira¹

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Sugarcane nutritional balance related to nitrogen fertilization The efficient management of fertilization in sugarcane begins with the identification of the nutritional plant requirement. Accordingly, three experiments were established in the State of Sao Paulo, the first in Typic Eutrustox, the second in a Rhodic Eutrustox and third in the Arenic Kandiustults. The treatments consisted of 0, 40, 80 and 120 kg N ha-1 in plant cane cycle (2005/2006). In first ratoon (2006/2007) the portions relating to the treatments 0 and 120 kg N ha-1 of the previous cycle had been subdivided and applied 0, 50, 100 and 150 kg N ha-1. In the second ratoon (2007/2008) repeated the doses and third ratoon (2008/2009) use was made of single dose application of 100 kg N ha-1. During the growth of cane plant and first ratoon held samples of sugarcane above ground and determined the dry matter production, nutrient accumulation and nitrogen critical level as a function of nitrogen doses. At the end of the plant cane and in three subsequent ratoons held the partitioning of sugarcane, through the separation of aerial parts in the stalks, dry leaf and green tops and underground part of the roots and rhizomes. Identified and separated in compartments determined dry matter and nutrients allocation. The dry matter production and accumulation of N, P, K, Ca, Mg, S, B, Cu and Zn in plant cane and first ratoon fitted the sigmoidal model, showing three distinct phases in which showed that absorption of these nutrients occur previously of dry matter production. The accumulation of Fe and Mn differed between the soils and obtained sigmoidal and cubic polynomial fits. The increasing effect of nitrogen fertilization on the accumulation of macronutrients, while the micronutrients, N doses had won only for B, Fe and Zn in plant cane and B, Fe and Mn in first ratoon. The nitrogen critical concentration in aerial parts of cane plant varied between 10,4 and 13,6 g kg-1 in the initial stages of growth, while that at the end of the cycle the values were 3,0 to 4.2 g kg-1. In first ratoon initial nitrogen critical concentrations ranged from 9,8 to 14,8 g kg-1 and those found at the last sampling ranged between 2,0 and 5,5 g kg-1. The order of nutrients build up in plant cane was K> N> Ca> S> Mg> Fe> P> Mn> Zn> B> Cu, and in the first ratoon the order was K> N> Ca> Mg> S> P = Fe> Mn> Zn> B> Cu. To produce 1 TCH was required extractions means of N,

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Curva crítica de diluição do nitrogênio para a cultura do melão

Cited by 7 publications

References 11 publications

Produtividade de frutos e teores de nutrientes no solo durante um cultivo de meloeiro

Produtividade de frutos e teores de nutrientes no solo durante um cultivo de meloeiro

Determining a critical nitrogen dilution curve for sugarcane

Balanço nutricional da cana-de-açucar relacionado à adubação nitrogenada

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