Comparação de métodos de mensuração de área foliar para a cultura da melancia

Souza, M. S. de; Alves, Samara Sibelle Vieira; Dombroski, Jeferson Luiz Dollabona; Freitas, José Dijalma Batista de; Aroucha, Édna Maria Mendes

doi:10.1590/s1983-40632012000200016

Cited by 30 publications

(16 citation statements)

References 9 publications

(8 reference statements)

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“…For growth evaluation, leaf number per plant (NL) was determined; leaf area (LA), determined by the corrected disk method (Souza et al, 2012), using a sample of 10 numbered leaves. Afterward, the plants were fractionated in leaves, stems, and roots, packed in paper bags and placed in a greenhouse with forced air circulation at a temperature of 65 ± 1 o C until reaching a constant mass.…”

Section: Methodsmentioning

confidence: 99%

Competition between cowpea and weeds for water: Effect on plants growth

Oliveira

Gama

Dombroski

et al. 2018

Agraria

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ABSTRACT:Water is the most important resource for agricultural production. The understanding of water competition mechanisms may lead to the development of new control strategies or coexistence with certain weed species, especially in situations where water is scarce. The objective of this work was to evaluate the competition between cowpea and weeds by water under the effect on plant growth. It was carried out experiment in greenhouse in the period from September to November 2015, in a randomized complete block design, with four replications. The treatments were arranged in factorial 5 x 2, with the first factor corresponding to the competition arrangements between the species (V. unguiculata + C. benghalensis; V. unguiculata + W. indica; V. unguiculata, C. benghalensis and W. indica in monoculture), and the second of water regimes (irrigated and water deficit). The water deficit reduces the growth of cowpea plants, C. benghalensis and W. indica. The competition between plants increases the effects of temporary water deficit in the soil. The W. indica leaf is the organ most affected by the water deficit. The weed specie W. indica has greater capacity competition for water with V. unguiculata than C. benghalensis. Key words: Commelina benghalensis; interference; Vigna unguiculata; Waltheria indica; water stressCompetição entre feijão-caupi e plantas daninhas por água: Efeito no crescimento das plantas RESUMO: A água é o recurso mais importante para a produção agrícola. O entendimento dos mecanismos de competição por água pode propiciar o desenvolvimento de novas estratégias de controle ou convivência com determinadas espécies de plantas daninhas, principalmente nas situações em que a água é escassa. Objetivou-se com este trabalho avaliar a competição entre feijão-caupi e plantas daninhas por água sob o efeito no crescimento das plantas. Foi realizado experimento em casa de vegetação no período de setembro a novembro de 2015, em delineamento em blocos casualizado, com quatro repetições. Os tratamentos foram arranjados em fatorial 5 x 2, com o primeiro fator correspondente aos arranjos de competição entre as espécies (feijão-caupi + trapoeraba; feijão-caupi + malva-branca; feijão-caupi, trapoeraba e malva-branca em monocultivo), e o segundo dos regimes hídricos (irrigado e déficit hídrico). O déficit hídrico reduz o crescimento das plantas de feijão-caupi, Commelina benghalensis e Waltheria indica. A competição entre plantas aumenta os efeitos do déficit hídrico temporário no solo. A folha de W. indica é o órgão mais afetado pelo déficit hídrico. A espécie daninha W. indica tem maior capacidade de competição por água com o feijão-caupi do que a C. benghalensis. Palavras-chave: Commelina benghalensis; interferência; Vigna unguiculata; Waltheria indica; estresse hídricoCompetition between cowpea and weeds for water: Effect on plants growth Rev. Bras.

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Section: Methodsmentioning

confidence: 99%

Competition between cowpea and weeds for water: Effect on plants growth

Oliveira

Gama

Dombroski

et al. 2018

Agraria

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“…Leaf area was estimated based on the leaf disc method (Souza et al, 2012b). Leaf discs with known area were collected using a leaf-disc sampler (Area = 1 cm 2 ), placed in paper packages, dried in an oven (65 °C for 72 h) and weighed separately, per plant.…”

Section: Methodsmentioning

confidence: 99%

Growth, biomass production and ions accumulation in Atriplex nummularia Lindl grown under abiotic stress

Melo

Souza

Almeida

et al. 2016

Rev. bras. eng. agríc. ambient.

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Atriplex nummularia is a halophyte of great importance in the recovery of saline soils and is considered as a model plant to study biosaline scenarios. This study aimed to evaluate biometric parameters, biomass production and the accumulation of ions in A. nummularia grown under abiotic stresses. Cultivation was carried out in a Fluvic Neosol for 100 days, adopting two water regimes: 37 and 70% of field capacity. Plants were irrigated with saline solutions containing two types of salts (NaCl and a mixture of NaCl, KCl, MgCl2 and CaCl2) at six levels of electrical conductivity: 0, 5, 10, 20, 30 and 40 dS m-1, arranged in a 6 x 2 x 2 factorial with 4 replicates, forming 96 plots. At the end of the experiment, plants were divided into leaves, stem and roots, for the determination of fresh matter (FM), dry matter (DM) and estimated leaf area (LA), besides the contents of Ca2+, Mg2+, Na+, K+ and Cl-. The type of salt did not influence plant growth or biomass production; however, it influenced the levels of Ca2+, Mg2+, Na+ and Cl- in the leaves and Mg2+, K+ and Cl- in the roots. Increase in salinity reduced the contents of Ca2+, Mg2+, Na+, K+ and Cl- for all treatments.

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“…Em cada amostragem foi colhida uma planta por parcela e separada em folhas, caules e raízes. A área foliar foi determinada usando o método do disco (Souza et al, 2012) corrigido. Para a correção, os valores obtidos pelo método do disco foram multiplicados por uma constante característica de cada cultivar.…”

Section: Variáveis Analisadasunclassified