Índices De Eficiência De Variedades Locais E Melhoradas De Milho Ao Fósforo

Machado, Cynthia Torres de Toledo; Furlani, Â. M. C.; Machado, Altair Toledo

doi:10.1590/s0006-87052001000300010

Cited by 30 publications

(47 citation statements)

References 24 publications

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“…From around 8 mg L -1 , the root/shoot ratio was nearly stable up to the highest P level. The hagler root/shoot ratio observed at low than at higher P levels corroborated a number of studies (Balemi & Schenk, 2009;Machado et al, 2001;Hu et al 2010) and is related to a severe decrease in shoot DM compared to root DM ( Figure 1a,d). According to Cakmak et al (1994), the drastically reduced leaf development at low P levels results in a lower leaf demand for photoassimilates, leading to a higher translocation thereof to roots growth.…”

Section: Resultssupporting

confidence: 88%

“…As lower levels drastically reduced shoot DM (Figure 1d), more P was allocated in roots to ensure growth (Figure 1a). Machado et al (2001) also found that maize plants proportionally allocated more P in roots, at the expense of shoots, at the lowest level in solution. According to Marschner (1995), P retention in roots is improved at insufficient levels, leading to redistribution via phloem and the supply of additional P.…”

Section: Resultsmentioning

confidence: 77%

“…These authors reported P deficiency symptoms at 1.0 mg L -1 and toxicity symptoms at 32 and 63 mg L -1 ; vigorous growth was observed to the application of 4 and 8 mg L -1 . In maize, Machado et al (2001) observed that increasing P concentrations in nutrient solution improved shoot DM up to 8 mg L -1 , but without effects on roots. It was expected that P levels that obtain maximum DM yields exceed the P concentration (0.002 to 2 mg L -1 ) usually found in soil solution (Fardeau, 1996).…”

Section: Resultsmentioning

confidence: 98%

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Nutrition, dry matter accumulation and partitioning and phosphorus use efficiency of potato grown at different phosphorus levels in nutrient solution

Fernandes

Soratto

2012

Rev. Bras. Ciênc. Solo

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SUMMARYHigh rates of phosphate fertilizers are applied to potato (Solanum tuberosum L.), which may cause antagonistic interactions with other nutrients and limit crop yields when over-supplied. The purpose of this study was to evaluate the influence of phosphorus (P) levels in nutrient solution on P use efficiency, nutritional status and dry matter (DM) accumulation and partitioning of potato plants cv. Ágata. The experiment was carried out in a greenhouse, arranged in a completely randomized block design with four replications. Treatments consisted of seven P levels in nutrient solution (0, 2, 4, 8, 16, 31, and 48 mg L -1 ). Plants were harvested after 28 days of growth in nutrient solution, and separated in roots, stems and leaves for evaluations. The treatment effects were analyzed by regression analysis. Phosphorus levels of up to 8 mg L -1 increased the root and shoot DM accumulation, but drastically decreased the root/shoot ratio of potato cv. Ágata. Higher P availability increased P concentration, accumulation and absorption efficiency, but decreased P use efficiency. Higher P levels increased the N, P, Mg, Fe, and Mn concentrations in roots considerably and decreased K, S, Cu, and Zn concentrations. In shoot biomass, N, P, K, and Ca concentrations were significantly increased by P applied in solution, unlike Mg and Cu concentrations. Although higher P levels (> 8 mg L -1 ) in nutrient solution increased P concentration, accumulation and absorption efficiency, the DM accumulation and partitioning of potato cv. Ágata were not affected.Termos de indexação: Solanum tuberosum, dry matter, mineral nutrition, nutrient interaction.(1) Received for publication in November 11, 2011 and approved in July 16, 2012.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 98%

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Nutrition, dry matter accumulation and partitioning and phosphorus use efficiency of potato grown at different phosphorus levels in nutrient solution

Fernandes

Soratto

2012

Rev. Bras. Ciênc. Solo

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“…Têm sido relatadas grandes diferenças entre as cultivares de milho, quanto à eficiência de utilização de P, o que resulta em variações de resposta à aplicação desse nutriente (Machado et al, 1999(Machado et al, , 2001.…”

Section: Introductionunclassified

Milho verde e feijão-caupi cultivados em consórcio sob diferentes lâminas de irrigação e doses de fósforo

Blanco

Cardoso

Filho

et al. 2011

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a resposta de milho verde (Zea mays) e de feijão-caupi (Vigna unguiculata), cultivados em consórcio, a lâminas de irrigação e doses de fósforo. Os experimentos foram realizados em 2008 e 2009, em delineamento de blocos ao acaso, com 25 tratamentos e quatro repetições. Os tratamentos consistiram de cinco lâminas de irrigação, a 70, 110, 140, 180 e 220% da evapotranspiração da cultura, e de cinco doses de P 2 O 5 a 0, 50, 100, 150 e 200% da dose de P recomendada. O milho foi semeado no espaçamento 0,80x0,40 m, e o feijão-caupi foi semeado dentro das linhas entre as plantas de milho. Não houve efeito das doses de P 2 O 5 ; porém, a resposta às lâminas de irrigação foi quadrática em milho e linear em feijão-caupi. As máximas produtividades técnicas de espigas de milho verde com palha (10,76 Mg ha -1 ) e sem palha (7,62 Mg ha -1 ) foram obtidas com a lâmina de 530 mm, intermediária às lâminas referentes a 180 e 220% da evapotranspiração da cultura. A maior produtividade de grãos verdes de feijão-caupi (3,40 Mg ha -1 ) foi obtida com a maior lâmina de água aplicada, de 644 mm.Termos para indexação: Vigna unguiculata, Zea mays, adubação, evapotranspiração. Green maize intercropped with cowpea under different irrigation depths and phosphorus dosesAbstract -The objective of this work was to evaluate the response of green maize (Zea mays) intercropped with cowpea (Vigna unguiculata) to irrigation depths and phosphorus doses. The experiments were carried out in 2008 and 2009 in a randomized block design, with 25 treatments and four replicates. Treatments consisted of five irrigation depths at 70, 110, 140, 180 and 220% of the crop evapotranspiration, and of five doses of P 2 O 5 : 0, 50, 100, 150 and 200% of the recommended P dose. Maize was sown at 0.80x0.40 m spacing, and cowpea was planted inside the lines among maize plants. There was no effect of P 2 O 5 doses, but the response to irrigation depths was quadratic for maize and linear for cowpea. The maximum technical yield of green ears of maize with straw (10.76 Mg ha -1 ) and without straw (7.62 Mg ha -1 ) was obtained with 530 mm depth, intermediary to the 180 and 220% of the crop evapotranspiration. The highest cowpea green grain (3.40 Mg ha -1 ) was obtained with the highest water depth, of 644 mm.Index terms: Vigna unguiculata, Zea mays, fertilization, evapotranspiration. IntroduçãoO feijão-caupi [Vigna unguiculata (L.) Walp.] é geralmente utilizado em consórcio com o milho (Zea mays L.) na região Meio-Norte do Brasil , o que permite ao pequeno agricultor diversificar sua produção e explorar a terra de modo mais intensivo. O feijão-caupi é cultivado em todos os estados da região Nordeste e pode ser colhido seco ou verde, a depender do mercado que se pretende atingir.O plantio de milho e de feijão-caupi, sob regime de sequeiro, em Teresina, PI, fica limitado aos meses de novembro a fevereiro, pois não há disponibilidade hídrica suficiente para garantir a produção nos plantios efetuados fora desse período, o que torna o...

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“…Root morphological traits, such as total root length, total root surface, root diameter and root hair density are related to P uptake in maize and depend on the plant genotype (Machado et al, 2001). In turn, AMF and diazotrophic bacteria may affect root morphological traits.…”

Section: Introductionmentioning

confidence: 99%

Interactions between diazotrophic bacteria and mycorrhizal fungus in maize genotypes

Miyauchi

Lima

Nogueira

et al. 2008

Sci. agric. (Piracicaba, Braz.)

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Some diazotrophic bacteria can fix nitrogen biologically in gramineous host plants. Generally, gramineous plants are also associated with mycorrhizal fungi, that can improve mainly plant P uptake. Among the factors affecting plant-microbe interactions, the plant genotype plays an important role. This study evaluates the effect of diazotrophic bacteria and an arbuscular mycorrhizal fungus (AMF), on five genotypes of maize (Zea mays L.), in relation to plant biomass, shoot N and P concentrations, and fine root morphological traits. The experimental design was entirely randomized in a factorial 5 × 4 × 2 arrangement, i.e., five maize genotypes (hybrids C333B, AS3466, and PREMIUM, and the inbreed lines lg40897-1 and lg40505-1), three diazotrophic bacteria (Azospirillum lipoferum, A. amazonense, and Burkholderia sp.) in addition to a control without bacterial inoculation, co-inoculated or not with the AMF Glomus clarum. The non-mycorrhizal plants inoculated with Azospirillum exhibited the highest N concentrations. The lines lg40897-1 and lg40505-1 showed higher P concentrations as compared to the hybrids, mainly when colonized by AMF. The higher levels of mycorrhizal colonization (90%) occurred in the C333B and lg40897-1 genotypes, which also exhibited a greater root diameter. Mycorrhiza increased shoot and root biomass, besides root traits as total length, specific length, total surface, and incidence of root hairs in all genotypes. In addition, mycorrhiza also stimulated the root colonization by diazotrophic bacteria. The bacteria did not affect root morphological traits and mycorrhizal colonization. Key words: Azospirillum, biological nitrogen fixation, mycorrhiza, root morphology INTERAÇÕES ENTRE BACTÉRIAS DIAZOTRÓFICAS E FUNGO MICORRÍZICO EM GENÓTIPOS DE MILHORESUMO: Algumas bactérias diazotróficas podem fixar N biologicamente em gramíneas, as quais se associam a fungos micorrízicos, o que pode levar a um aumento principalmente da absorção de P. Dentre os fatores que afetam as interações planta-microrganismos, o genótipo da planta tem importante papel. Esse trabalho avalia o efeito de bactérias diazotróficas e de um fungo micorrízico arbuscular (FMA) em cinco genótipos de milho (Zea mays L.), em relação à biomassa das plantas, teores de N e P na parte aérea e parâmetros relacionados à morfologia das raízes finas. O delineamento experimental foi inteiramente casualizado, em arranjo fatorial 5 × 4 × 2, sendo cinco genótipos de milho (híbridos C333B, AS3466, PREMIUM e as linhagens lg40897-1 e lg40505-1), três bactérias diazotróficas (Azospirillum lipoferum, A. amazonense e Burkholderia sp.), mais um controle sem bactéria, coinoculadas ou não com o FMA Glomus clarum. As plantas sem FMA e inoculadas com Azospirillum apresentaram os maiores teores de N. As linhagens lg40897-1 e lg40505-1 apresentaram maior concentração de P em relação aos híbridos, principalmente quando micorrizadas. Os maiores níveis de colonização micorrízica (90%) ocorreram nos genótipos C333B e lg40897-1 que, por sua vez, apresentaram ma...

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Índices De Eficiência De Variedades Locais E Melhoradas De Milho Ao Fósforo

Cited by 30 publications

References 24 publications

Nutrition, dry matter accumulation and partitioning and phosphorus use efficiency of potato grown at different phosphorus levels in nutrient solution

Nutrition, dry matter accumulation and partitioning and phosphorus use efficiency of potato grown at different phosphorus levels in nutrient solution

Milho verde e feijão-caupi cultivados em consórcio sob diferentes lâminas de irrigação e doses de fósforo

Interactions between diazotrophic bacteria and mycorrhizal fungus in maize genotypes

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