Optimization of the N:p:k Ratio in the Nutrient Medium of Some Soilless Aromatic and Medicinal Plants

Mairapetyan, S.K.; Tadevosyan, A.H.; Alexanyan, S.S.; Ստեփանյան, Բ. Թ.

doi:10.17660/actahortic.1999.502.2

Cited by 7 publications

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“…Sinha & Singh (1982), ao avaliarem Mentha arvensis L. em solução nutritiva de Hoagland & Arnon modificada, verificaram que a deficiência de potássio aumentou a porcentagem do conteúdo de óleo essencial, m as dim inuiu consideravelmente o total de óleo essencial por planta. Mairapetyan et al (1999), quando estudaram a otimização das relações N:P:K em M. piperita, em cultivo hidropônico, concluíram que a menta requer maior suprimento de fósforo para o máximo acúmulo de óleo essencial. Leal (2001) Embora a TAL e TCR não tenham mostrado diferenças marcantes entre os tratamentos, a RAF e a AFE evidenciaram o efeito da variação dos níveis dos nutrientes no crescimento vegetal.…”

Section: Resultado E Discussãounclassified

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Translocação orgânica, produtividade e rendimento de óleo essencial de Mentha piperita L. cultivada em solução nutritiva com variação dos níveis de N, P, K e Mg

David

Boaro²

2009

Rev. bras. plantas med.

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RESUMO:O estudo objetivou avaliar translocação orgânica, índices fisiológicos da análise de crescimento e rendimento do óleo essencial de Mentha piperita L. cultivada em solução nutritiva com variação dos níveis de N, P, K e Mg. Assim, foram avaliados os quatro tratamentos contendo 50% N, P, K, 25% Mg; 50% N, P, K, Mg; 65%N, 50%P, 25%K, 100% Mg e 100% N, P, K, Mg. A translocação orgânica foi avaliada por meio da determinação da razão de massa foliar (RMF) e da distribuição de massa seca para os diferentes órgãos. Os índices fisiológicos razão de área foliar (RAF), área foliar específica (AFE), taxa assimilatória líquida (TAL) e taxa de crescimento relativo (TCR) derivadas que compõem a análise de crescimento foram estimados pelo programa ANACRES, após ajuste exponencial quadrático da área foliar e massa seca de lâminas foliares e total da planta em relação ao tempo. O rendimento do óleo essencial, em porcentagem, foi calculado após extração da parte aérea por hidrodestilação. As plantas submetidas ao tratamento com nível completo de nutrientes (100%N/P/K/Mg) exportaram com menor eficiência o material orgânico a partir da folha e a RMF mostrou queda mais lenta, devido à retenção desse material por mais tempo no local de sua produção. Além disso, não apresentaram melhor produtividade e as curvas da TAL e TCR mostraram quedas mais lentas. As plantas submetidas ao tratamento com 65%N/50%P/25%K/100%Mg revelaram adequada exportação de matéria orgânica da folha para caule e pecíolos, conforme demonstra a RMF e a distribuição de massa seca para esses órgãos. Revelaram ainda a RAF mais elevada no inicio do desenvolvimento e mais baixa aos 94 DAT, indicando sombreamento das folhas como resultado de seu crescimento. A AFE dessas plantas mostrou menor variação durante o ciclo, refletindo espessura mais constante de suas folhas. A TAL e a TCR apresentaram curvas decrescentes, com quedas bem acentuadas em relação às demais plantas. Todos esses índices indicam melhor produtividade das plantas submetidas ao tratamento 65%N/50%P/25%K/100%Mg, que também apresentaram rendimento de óleo essencial, em média, maior durante o ciclo. Conclui-se que a redução de 35% de N, 50% de P, 75% de K (65%N/50%P/25%K/100%Mg) é indicada para o cultivo e extração de óleo essencial de M. piperita. Palavras-chave:Mentha piperita, óleo essencial, nutrição mineral, hidroponia ABSTRACT: Organic translocation, productivity and essential oil yield of Mentha piperita L. cultivated in nutrient solution with varying N, P, K and Mg levels. This study aimed to evaluate organic translocation, physiologic indexes of growth analysis and essential oil yield of Mentha piperita L. cultivated in nutrient solution with varying levels of N, P, K and Mg. Thus, four treatments were evaluated: 50% N, P, K, 25% Mg; 50% N, P, K, Mg; 65% N, 50% P, 25% K, 100% Mg; and 100% N, P, K, Mg. Organic translocation was assessed through leaf mass ratio (LMR) and dry matter distribution to the different organs. The physiologic indexes leaf area ratio (LAR), specific leaf area (SLA), net...

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Section: Resultado E Discussãounclassified

“…Desequilíbrios entre concentrações interferem na disponibilidade, absorção e translocação dos elementos essenciais na planta. Assim, além da disponibilidade de nutrientes, também deve ser considerada a razão elementar adequada entre eles para a obtenção de crescimento ótimo das plantas (Marenco et al, 2001).…”

Section: Introductionunclassified

Translocação orgânica, produtividade e rendimento de óleo essencial de Mentha piperita L. cultivada em solução nutritiva com variação dos níveis de N, P, K e Mg

David

Boaro²

2009

Rev. bras. plantas med.

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“…Plants with low nutrient supply (F)) were supplied with c. 1% of this level: 37 lM N and 11 lM P i . The mass-based N : P ratio of fertilizer used here was 1.4 and was selected to be in the optimal range for plant growth (fertilizer N : P between 1 and 15), that is where plants are expected to be co-limited by N and P (Mairapetyan et al, 1999;Gusewell & Koerselman, 2002;Garrish et al, 2010). Maximum leaf lengths at the start (t0) and end of the experiment (t1) were used to calculate plant dry weight, as this proxy is highly 464 Research New Phytologist correlated with plant dry weight (R 2 = 0.99) (Laube & Zotz, 2003).…”

Section: Methodsmentioning

confidence: 99%

Are vascular epiphytes nitrogen or phosphorus limited? A study of plant 15N fractionation and foliar N : P stoichiometry with the tank bromeliad Vriesea sanguinolenta

Wanek

Zotz

2011

New Phytologist

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Summary• Although there is unambiguous evidence for vascular epiphytic plants to be limited by insufficient water and nutrient supply under natural conditions, it is an open debate whether they are primarily phosphorus (P) or nitrogen (N) limited.• Plant 15 N fractionation and foliar N : P stoichiometry of a tank epiphyte (Vriesea sanguinolenta), and its response to combined N-P fertilization, were studied under semi-natural conditions over 334 d to clarify the type of nutrient limitation.• Plants collected in the field and experimental plants with limited nutrient supply showed significant plant 15 N fractionation (mean 5‰) and plant N : P ratios of c.13.5. Higher relative growth rates and declines in plant 15 N fractionation (0.5‰) and in foliar N : P ratios to 8.5 in the high N-P treatment indicated that these epiphytes were P limited in situ. The critical foliar N : P ratio was 10.4, as derived from the breakpoint in the relationship between plant 15 N fractionation and foliar N : P.• We interpret the widespread 15 N depletion of vascular epiphytes relative to their host trees as deriving from 15 N fractionation of epiphytes as a result of P limitation.High foliar N : P ratios (> 12) corroborate widespread P limitation (or co-limitation by N and P) of epiphytic bromeliads and, possibly, other epiphyte species.

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“…Some studies have shown that shifts in N:P:K ratios in plants are related to changes in plant growth (Mairapetyan et al . ) and the adaptation of plants (Sardans & Peñuelas ; Sardans et al . ) and bryophytes (Sardans & Peñuelas ) to drought in Mediterranean forests and shrublands.…”

Section: Introductionmentioning

confidence: 99%

Stoichiometry of potassium is largely determined by water availability and growth in Catalonian forests

et al. 2012

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Summary The study of the relationships between organisms and environmental elemental stoichiometry and ecosystem structure and function has recently received increasing attention. Some elements, however, have been less studied or have even been neglected. One of these elements is K, despite its critical importance in the water economy of plants. We hypothesized that K concentrations and especially K contents (concentrations × biomass), their stoichiometries with respect to C, N, and P contents, and their relative allocations to foliar and woody compartments would be linked to climatic gradients in the availability of water, forest type and growth. We tested this hypothesis by analysing the data set of the Catalan Forest Inventory. Evergreens, the type of tree with the slowest growth, showed the highest K contents, especially in wood, and the lowest plasticity to change the stoichiometry of K within and between foliar and woody biomasses along climatic gradients. The allocation of K to leaves in relation to the allocation of C, N and P increased with mean annual precipitation (MAP) and was concomitant with decreases in the allocation of K to wood in relation to the allocation of C, N and P (higher K:CL/W, K:NL/W and K:PL/W). In summer, the driest period, higher K:C, K:N and K:P content ratios in leaves were accompanied by lower K:C, K:N and K:P content ratios in wood, mainly in the species at the driest sites. Higher K:C and K:N content ratios in leaves and above‐ground biomass in all forest types, and higher K:CL/W and K:NL/W in conifers and deciduous trees were related to higher growth. K contents of leaves were better correlated with tree growth than were K concentrations of leaves in all forest types. These results show that the stoichiometry of K is strongly related to the availability of water and that the uptake of K is more related to the uptake of water than the uptake of N and P. Stoichiometric differences involving K are related to both the response of plants to drought and to plant growth. K thus plays a key role, together with N and P, in the response of plants to climatic gradients for improving the capacities for growth and adaptation to water stress along environmental gradients and through time (seasons). Moreover, these results show that the differences in stoichiometric composition and plasticity involving K contents can underlie the long‐term adaptation of trees to different ecological styles of life. K should thus be considered in ecological stoichiometric studies of terrestrial plants.

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Optimization of the N:p:k Ratio in the Nutrient Medium of Some Soilless Aromatic and Medicinal Plants

Cited by 7 publications

References 0 publications

Translocação orgânica, produtividade e rendimento de óleo essencial de Mentha piperita L. cultivada em solução nutritiva com variação dos níveis de N, P, K e Mg

Translocação orgânica, produtividade e rendimento de óleo essencial de Mentha piperita L. cultivada em solução nutritiva com variação dos níveis de N, P, K e Mg

Are vascular epiphytes nitrogen or phosphorus limited? A study of plant 15N fractionation and foliar N : P stoichiometry with the tank bromeliad Vriesea sanguinolenta

Stoichiometry of potassium is largely determined by water availability and growth in Catalonian forests

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