Avaliação do crescimento de plantas de milho em função de doses de potássio e estresse hídrico

Vilela, E. F.; Büll, Leonardo Theodoro

doi:10.1590/s0100-06831999000200012

Cited by 14 publications

(9 citation statements)

References 12 publications

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“…Increased K application rates in the corn crop also increased K leaf content but reduced Ca and Mg leaf contents (Vilela and Büll, 1999). (Figure 4).…”

Section: Resultsmentioning

confidence: 95%

Nitrogen and Potassium Fertilization in a Guava Orchard Evaluated for Five Cycles: Effects on the Plant and on Production

Montes

Parent

Amorim

et al. 2016

Rev. Bras. Ciênc. Solo

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Guava response to fertilization can be monitored through plant tissue analysis. Correct interpretation of these results, based on standard levels, is of great importance for correct nutrient management of the crop. However, standard levels are constantly criticized for not considering interactions among elements. To improve the nutritional diagnosis of 'Paluma' guava (Psidium guajava L., Myrtaceae), an experiment was conducted using nitrogen fertilization (0, 0.5, 1.0, and 2.0 kg per plant per cycle of N, with urea as a source with 45 % N), and potassium fertilization (0, 0.55, 1.1, and 2.2 kg per plant per cycle of K 2 O, with potassium chloride as a source with 60 % K 2 O) in an irrigated commercial area for five consecutive cycles, 2009 through 2012, observing the influence of fertilizers and climate and assessing yield and leaf element content, using the concept of isometric log ratios (ilr) to interpret leaf analysis results (N, P, Ca, Mg, K, and S). This paper showed that nutrient balances and nutrient concentration values can be interpreted coherently using compositional data analysis. Ranges of nutrient balances also were established for "Paluma" guava and validated through ranges grounded in nutrient contents currently used in Brazil. Nitrogen fertilization increased "Paluma" guava yield. The 0.5 kg N application rate per plant and the other studied treatments practically showed the same results, and their values were affected by pruning time as well as the nutrient balances.

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“…Increased K application rates in the corn crop also increased K leaf content but reduced Ca and Mg leaf contents (Vilela and Büll, 1999). (Figure 4).…”

Section: Resultsmentioning

confidence: 95%

Nitrogen and Potassium Fertilization in a Guava Orchard Evaluated for Five Cycles: Effects on the Plant and on Production

Montes

Parent

Amorim

et al. 2016

Rev. Bras. Ciênc. Solo

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“…A maior dose de potássio proporcionou maior acúmulo de fitomassa na parte aérea, aproximadamente 24 % maior que a menor dose, enquanto o maior teor de água no solo levou ao maior acúmulo de fitomassa seca nas raízes do milheto, independentemente das doses de potássio (Figura 5), tal como os resultados encontrados por Vilela & Büll (1999), para o milho cultivado em três teores de água (sem estresse hídrico, estresse moderado e estresse intenso).…”

Section: Figura 1 Contribuição Relativa Dos Mecanismos De Difusão E unclassified

Morfologia radicular e suprimento de potássio às raízes de milheto de acordo com a disponibilidade de água e potássio

Rosolem

Mateus

Godoy

et al. 2003

Rev. Bras. Ciênc. Solo

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RESUMOO milheto (Pennisetum glaucum) é cultivado em épocas com deficiência hídrica, o que pode afetar a absorção de K. Este trabalho visou quantificar a importância de potenciais de água do solo (-0,03; -0,05; -0,10 e -0,50 MPa), associados a doses de potássio (15 e 120 mg dm -3 de K) na morfologia radicular e nos processos de transporte de K às raízes de milheto. O experimento foi realizado em Botucatu (SP), em casa de vegetação. O milheto foi cultivado até 28 dias após a emergência, quando foram avaliados a fitomassa produzida e os teores de K, assim como a morfologia radicular. Foi estimada a contribuição do fluxo de massa e da difusão para o transporte de K no solo. Independentemente da dose de potássio e do teor de água no solo, a difusão foi o principal mecanismo de transporte de K até as raízes do milheto. Houve maior contribuição relativa do fluxo de massa, que correspondeu a 12 % do absorvido, na menor dose de potássio, contra 4 % na maior dose. Não houve efeito da disponibilidade hídrica nos mecanismos de transporte de K até as raízes do milheto.Termos de indexação: absorção de K, difusão, fluxo de massa, Pennisetum glaucum.

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“…Vilela & Büll (1999) also observed a proportionally greater retention of dry mass in leaves under more pronounced soil water deficits. This is an interesting result for an edible plant, because even at relative small availability of water, proportionally more mass is accumulated in the edible organ (leaves).…”

Section: Resultsmentioning

confidence: 69%

Growing Pereskia aculeata under intermittent irrigation according to levels of matric potential reduction

Queiroz

Andrade

Morais

et al. 2015

Pesqui. Agropecu. Trop.

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Pereskia aculeata Mill., popularly known in Brazil as “Ora-pro-nobis”, is an unconventional edible vegetable. Taking into account its potential for agronomic cultivation, this study aimed to evaluate the growth response of this plant under intermittent drought through controlled reductions in the substrate matric potential, in a greenhouse. Treatments consisted of adding to the pots a volume of water to raise the matric potential to -5 kPa, according to the water retention curve in the substrate, whenever the mean substrate matric potential reached values between -10 kPa and -70 kPa, depending on the treatment. At 140 days after transplanting, leaf area and dry mass of leaves, stems and roots were determined. The intermittent reduction of the matric potential in the root zone of “Ora-pro-nobis” affected less the dry mass accumulation in leaves (reduction of 21.4%) than in stems (reduction of 48.1%) and roots (reduction of 63.7%), and that is interesting because leaves are the main commercial product of this plant. The treatment also modified the proportionality of dry mass allocation among plant parts and reduced the photosynthetic efficiency of leaves, fact evidenced by the linear increase of the specific leaf area (0.63 cm2 g-1kPa-1) and leaf area ratio (0.39 cm-2 g-1kPa-1), although not affecting directly the leaf area.

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Avaliação do crescimento de plantas de milho em função de doses de potássio e estresse hídrico

Cited by 14 publications

References 12 publications

Nitrogen and Potassium Fertilization in a Guava Orchard Evaluated for Five Cycles: Effects on the Plant and on Production

Nitrogen and Potassium Fertilization in a Guava Orchard Evaluated for Five Cycles: Effects on the Plant and on Production

Morfologia radicular e suprimento de potássio às raízes de milheto de acordo com a disponibilidade de água e potássio

Growing Pereskia aculeata under intermittent irrigation according to levels of matric potential reduction

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