Dinâmica do crescimento, distribuição de matéria seca e produção de pimentão em ambiente protegido

This study aimed to evaluate the growth, assimilate partitioning and seed vigor expression of rye seeds subjected to waterlogging during development. The experimental design was completely randomized with six replications and three treatments. The treatments involved different waterlogging periods: a) no waterlogging; b) single waterlogging of three days; and c) two soil waterlogging periods of three days. The plants were collected at regular intervals of 14 days after emergence until the end of the growth cycle, measuring the dry matter accumulation and the leaf area for growth analysis and dry matter partition between the organs and number of flowers. The other calculated indices included the harvest index and relative seedling emergence rate originating from the seeds of plants that were maintained at field capacity and under the effect of soil waterlogging. Rye plants that were not subjected to waterlogging had a higher dry matter, dry matter production rates and harvest index compared to the plants under the effect of two soil waterlogging periods. Plants under the effect of two waterlogging periods showed drastic alterations in their growth rates and assimilate partitioning during development, and seed vigor expression was negatively affected when the plants were subjected to soil waterlogging.

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“…1D-E). The decrease in R w , according to Fontes et al (2005), is related to the decrease in E a and F a .…”

Section: Resultsmentioning

confidence: 98%

Plant growth analysis and seed vigor expression: effects of soil waterlogging during rye plant development

et al. 2015

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“…As eggplant has continuous growth, the leaves may not expand at the same rates while growth is occuring, and this, according to Scott & Batchelor (1979), promotes decreased SLA. Thus, if the mass is considered as directly related to volume, SLA indicates inverse leaf thickness (Fontes et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

“…Decreasing LAR indicates that there is a decrease in photoassimilates assigned to leaves (Brighenti et al, 1993). It is possible that, as a consequence, the relative growth rate decreases (Fontes et al, 2005). LAR may also decrease as a result of self-shading, which promotes leaf area decrease (Benincasa, 1988).…”

Section: Leaf Area Ratio and Root Shoot Dry Matter Ratiomentioning

confidence: 99%

Eggplant growth as affected by bovine manure and magnesium thermophosphate rates

Cardoso

Pereira

Souza

2008

Sci. agric. (Piracicaba, Braz.)

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Plant growth is influenced by nutrient availability. The objective of this research was to study, under greenhouse conditions, eggplant growth as affected by rates of bovine manure and magnesium thermophosphate (g kg -1 and mg kg -1 , respectively), according to a "Box central composite" matrix: 4.15-259; 4.15-1509; 24.15-259; 24.15-1509; 0.0-884; 28.3-884; 14.15-0,0; 14.15-1768; 14.15-884. Potassium sulfate (170 mg kg -1 ) and 200 mL per pot of cow urine solution were applied four times, but the concentration of the last two applications (200 mL/H 2 O L) was twice of that of the first two. Additional treatments: magnesium thermophosphate without cow urine and triple superphosphate with urea, both with nutrient levels equivalent to the bovine manure, P 2 O 5 and potassium sulfate to the combination 14.15-884. The experimental design consisted of randomized blocks with four replicates. Leaf area (LA) and LA ratio increased as quadratic functions with manure rates, with negative interaction for thermophosphate. Leaf dry matter mass (DMM) had an increasing quadratic function with rates for both fertilizers. The higher combined rates of both fertilizers resulted in the smallest specific leaf area, but also the highest values of shoot and root DMM, total DMM and, with positive interaction in relation to root shoot dry matter ratio. The relative growth rate in stem height, and also in diameter, increased with manure, according to quadratic and linear functions, respectively. The cow urine effect was, in general, lower than that of urea. The plant's overall growth was more influenced by manure. Root DMM and shoot DMM were greater with high K and P. Key words: Solanum melongena, organic fertilization, phosphorus, cow urine CRESCIMENTO DA BERINJELA EM FUNÇÃO DE DOSES DE ESTERCO BOVINO E DE TERMOFOSFATO MAGNESIANORESUMO: O crescimento em plantas é influenciado pela disponibilidade de nutrientes. O objetivo deste trabalho foi estudar, em abrigo telado, o crescimento da berinjela em função de doses de esterco bovino e termofosfato magnesiano (g kg -1 -mg kg -1 , respectivamente), conforme a matriz "composto central de Box": 4,15-259; 4,15-1509; 24,15-259; 24,15-1509; 0,0-884; 28,3-884; 14,15-0,0; 14,15-1768; 14,15-884. Acrescentaram-se sulfato de potássio (170 mg kg -1 ) e quatro parcelas de 50 mL por vaso de solução de urina de vaca, as duas últimas possuindo concentração de 200 mL L -1 de H 2 O, o dobro da inicial. Tratamentos adicionais: termofosfato magnesiano sem urina de vaca e superfosfato triplo com uréia, iguais em esterco, P 2 O 5 e sulfato de potássio, à combinação 14,15-884. O delineamento experimental foi em blocos casualizados com quatro repetições. A área foliar (AF) e a razão de AF aumentaram, quadraticamente, com as doses de esterco, porém, a interação com o termofosfato foi negativa. A massa de matéria seca (MMS) de folhas incrementou, quadraticamente, com as doses dos dois insumos. Na combinação das maiores doses de ambos ocorreram a menor AF específica e os maiores valores da MMS da parte aére...

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“…Pereira et al (2003) julgam importante avaliar o crescimento do sistema radicular e da parte aérea, com base no acúmulo de matéria seca e do incremento da área foliar, em porta-enxertos cítricos. Além disto, é notório que os índices determinados na análise de crescimento indicam a capacidade do sistema assimilatório das plantas em sintetizar (fonte) e alocar a matéria orgânica nos diversos órgãos (drenos) que dependem da fotossíntese, respiração e translocação de fotoassimilados dos sítios de fixação de carbono, aos locais de utilização ou de armazenamento, onde ocorrem o crescimento e a diferenciação dos órgãos (Fontes et al, 2005).…”

Section: Fitomassa Da Parte Aérea (G)unclassified

Produção de fitomassa em genótipos de citros submetidos a estresse hídrico na formação do porta-enxerto

Suassuna¹,

Fernandes

Nascimento³

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M ODevido à importância dos porta-enxertos no sucesso da citricultura e sua influência na tolerância a fatores de estresse, desenvolveu-se este estudo com o objetivo de avaliar a tolerância de porta-enxertos de citros ao estresse hídrico. Estudaram-se dois fatores: manejo hídrico ('sem estresse' e 'com estresse', neste último caso, com irrigação baseada em 50 e 25% da capacidade de campo) e porta-enxerto (10 genótipos de citros fornecidos pelo Programa de Melhoramento Genético de Citros da Embrapa Mandioca e Fruticultura Tropical). Adotou-se o delineamento em blocos casualizados com três repetições e 15 plantas por parcela; avaliaram-se as fitomassas da parte aérea, das folhas, do caule, da raiz e total, além da relação raiz/parte aérea, razão de peso foliar e rendimento relativo. O déficit hídrico reduziu a fitomassa total e incrementou, em alguns porta-enxertos, a relação raiz/parte aérea. A fitomassa foliar é a variável mais afetada, negativamente, nos porta-enxertos de citros sob deficiência hídrica. O genótipo 'TSKFL x CTTR-017' possui capacidade de adaptação ao déficit hídrico, com potencial promissor para uso em áreas sujeitas às condições de seca. Palavras-chave: Citrus spp, híbridos, deficiência hídrica, tolerânciaDry matter production of citrus genotypes under water stress during the rootstock formation A B ST R A C T Knowing the importance of the rootstocks for the success of the citrus crop and its influence on tolerance to stress factors, this study was conducted in order to evaluate tolerance of citrus rootstocks to water stress studying two factors: water management ('without stress' and 'under stress' and in this latter case, the irrigation was based on 50 and 25% moisture of field capacity) and rootstocks factor (10 citrus genotypes provided by Citrus Breeding Program of Embrapa Cassava and Tropical Fruits). A randomized block design was adopted with three replications and 15 plants per plot. Shoot, leaves, stem, root and total dry mass, root/shoot ratio, leaf weight ratio and relative yield were evaluated. Water deficit reduced the total dry mass and increased the root/shoot ratio in some rootstocks. Leaf dry mass is the most sensible variable in citrus rootstocks under water deficit. 'TSKFL CTTR x-017' has a significant capacity of tolerance to drought, with promising potential for use in areas under drought conditions.

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Dinâmica do crescimento, distribuição de matéria seca e produção de pimentão em ambiente protegido

Cited by 40 publications

References 19 publications

Plant growth analysis and seed vigor expression: effects of soil waterlogging during rye plant development

Plant growth analysis and seed vigor expression: effects of soil waterlogging during rye plant development

Eggplant growth as affected by bovine manure and magnesium thermophosphate rates

Produção de fitomassa em genótipos de citros submetidos a estresse hídrico na formação do porta-enxerto

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