Condutância da folha em milho cultivado em plantio direto e convencional em diferentes disponibilidades hídricas

Bianchi, Cleusa Adriane Menegassi; Bergonci, João Ito; Bergamaschi, Homero; Dalmago, Genei Antônio; Heckler, Bruna Maria Machado; Comiran, Flávia

doi:10.1590/s0103-84782007000200004

Cited by 10 publications

(8 citation statements)

References 13 publications

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“…Esses Tabela 3 -Valores médios para condutância estomática (Gs), taxa fotossintética (A), taxa de transpiração (E) e temperatura das folhas (T1) de plantas de feijão-de-corda aos 58 DAP, nos horários de 7 h 30 min e 12 h Médias seguidas com as mesmas letras na coluna não diferem, estatisticamente, pelo teste de Tukey ao nível de 5% resultados não demonstram coerência com os resultados alcançados por Bianchi et al (2007), os quais observaram que essa variável apresentou relação direta com o nível de disponibilidade de água no solo, independentemente do sistema de manejo do solo. Nesta pesquisa, identificou-se uma relação direta com o nível de disponibilidade de água, mas por influência das práticas no manejo do solo que o dotaram de maior capacidade em armazenar e disponibilizar água para as plantas (solo não saturado).…”

Section: Resultsunclassified

Effect of soil management on water deficit, gas exchange and cowpea yield in the semi-arid region

Fernandes

Lacerda

Andrade

et al. 2015

Revista Ciência Agronômica

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Efeito de manejos do solo no déficit hídrico, trocas gasosas e rendimento do feijão-de-corda no semiárido 1Effect of soil management on water deficit, gas exchange and cowpea yield in the semi-arid region T-P, solo mobilizado somente pela enxada; T-ESC, solo escarificado a 0,30 m; T-CS, solo com subsolagem e captação in situ; o T-CCM, subsolagem, captação in situ e cobertura morta e o T-CCO, com subsolagem, captação in situ, cobertura morta e compostagem. Os resultados mostraram que a interação das práticas da cobertura morta, compostagem, subsolagem e a técnica de captação in situ, dotaram o T-CCO de maior capacidade de captar e armazenar água no solo, com um consequente aumento da disponibilidade hídrica para as culturas. Tal fato aumentou o rendimento da T-CCO em relação aos demais tratamentos na ordem (1º ao 4º) de 41%, 28%, 47% e 12%. Para um déficit hídrico gerado por 10 dias consecutivos sem chuvas, o T-CCO apresentou os melhores resultados na manutenção do estado fisiológico das plantas. No entanto, quando o solo se encontra próximo à capacidade de campo, as práticas de manejo do solo não mostraram diferenças significativas na condutância estomática, fotossíntese, transpiração e na temperatura foliar. Tal fato expressa a importância do manejo do solo em condições limitantes de umidade. Palavras-chave:Vigna unguiculata. Solos-manejo. Plantio de sequeiro. Estresse hídrico.ABSTRACT -Rainfall variability in semi-arid areas often results in water shortages during the cycle of the cowpea (Vigna unguiculata (L.) Walp.), affecting yield. This study aimed to investigate the effect of different management practices on soil water deficit, leaf gas exchange and the yield of the cowpea under rainfed conditions in a semi-arid region. The experimental design was completely randomised into split lots of five management systems (treatments) and two layers of soil (0.15 and 0.30 m), with four replications. The management systems investigated were: T-P, soil turned by hoe only; T-ESC, ploughing to 0.30 m only; T-CS, soil with subsoiling and in situ catchment; T-CCM, subsoiling, in situ catchment and mulch, and T-CCO, subsoiling, in situ catchment, mulch and compost. The results showed that the interaction of the practices of mulching, composting, subsoiling and in situ catchment, resulted in the T-CCO having a greater capacity to capture and store water in the soil, with a consequent increase in water availability for the crops. This fact increased the yield of T-CCO in relation to the other treatments by (1st to 4th) 41%, 28%, 47% and 12%. For a water deficit generated after ten consecutive days without rain, the T-CCO displayed the best results in maintaining the physiological state of the plants. However, when the soil was close to field capacity, there were no significant differences for soil management practice in stomatal conductance, photosynthesis, transpiration or leaf temperature. This fact demonstrates the importance of soil management under limiting conditions of moisture.

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Section: Resultsunclassified

Effect of soil management on water deficit, gas exchange and cowpea yield in the semi-arid region

Fernandes

Lacerda

Andrade

et al. 2015

Revista Ciência Agronômica

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“…Plants frequently show physiological responses when exposed to water deficit situations, which results directly in water savings. Thus, stomatal conductance is directly associated with water availability in the soil (Bianchi et al, 2007). When evaluating the Ic/Ac ratio, the lower value was verified in treatments without herbicide application (Table 5).…”

Section: Resultsmentioning

confidence: 88%

Physiologic characteristics of corn and Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster in intercropping cultivation

Rodrigues

Galvão²,

Ferreira

et al. 2014

Chilean J. Agric. Res.

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Competition between weeds and crops results in a lower availability of some resources to crop species, which causes deficiencies, such as water and nutritional deficiencies and low light quality or quantity. The aims of this study were to evaluate the effects of Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster, cv. Xaraés (brachiaria) emergence times comparing with corn (Zea mays L.), in addition to the fertilization and application of different nicosulfuron and atrazine herbicides levels, on the physiological characteristics of intercropped species. The physiological characteristics Brachiaria plants that were treated with herbicides were negatively affected. The emergence time of Brachiaria plants in comparison with corn altered the physiological characteristics of both. The Brachiaria plants that emerged before corn presented higher photosynthetic and transpiration rates and reduced the intensity of these characteristics in corn. Thus, the Brachiaria plants that emerged before the corn crop presented a higher physiological efficiency, and they were more competitive than the weeds that emerged during other seasons.

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“…A partir das variações climáticas, pressupõe-se que haja uma resposta fisiológica das plantas no sentido de diminuir a abertura estomática induzida por esse fator. De acordo com Bianchi et al (2007), a condutância foliar do milho tem relação direta com o nível de disponibilidade de água no solo, independentemente do sistema de manejo edáfico adotado. Segundo os autores (Marenco et al, 2006;Flexas et al, 2006), a baixa concentração de CO 2 e a alta irradiância favorecem diretamente a abertura estomática.…”

Section: Resultsunclassified

Morfofisiologia de plantas de milho em competição com picão-preto e trapoeraba submetidas a roçada

Lemos¹,

Galvão²,

Silva³

et al. 2012

Planta daninha

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-The efficiency of using clearings to control Picão-preto (Bidens pilosa) and Trapoeraba (Commelina benghalensis) was evaluated based on the morphological and physiological characteristics of corn.An experiment under greenhouse conditions was conducted in 2009/2010.The physiological characteristics were obtained in a subdivided parcel, with four evaluations being performed throughout the corn cycle (1-before the first clearing (V3); 2-after the first clearing (V6);3-after the second clearing (V9); and 4-corn plants at the fluorescence stage), by means of Infra Red Gas Analyzer. Two clearings reduced the influence of B. pilosa and C. benghalensis weeds on the morphological characteristics of corn. The clearing did not influence the physiological aspects of the corn plants in competition with weeds. C. benghalensis caused a greater interference in the physiological characteristics of corn, reducing photosynthesis and transpiration. When not cleared, B. pilosa species had a greater capacity of interfering in corn morphology.

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Condutância da folha em milho cultivado em plantio direto e convencional em diferentes disponibilidades hídricas

Cited by 10 publications

References 13 publications

Effect of soil management on water deficit, gas exchange and cowpea yield in the semi-arid region

Effect of soil management on water deficit, gas exchange and cowpea yield in the semi-arid region

Physiologic characteristics of corn and Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster in intercropping cultivation

Morfofisiologia de plantas de milho em competição com picão-preto e trapoeraba submetidas a roçada

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