Effects of potassium and magnesium nutrition on the quality components of different types of tea

Ruan, Jianyun; Wu, Xun; Härdter, R.

doi:10.1002/(sici)1097-0010(199901)79:1<47::aid-jsfa172>3.0.co;2-a

Cited by 68 publications

(45 citation statements)

References 12 publications

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“…Treatments were applied one week after transplanting. All plants received 1% of MgSO 4 , ZnO, Microfel ® Fe (29% Fe), mono ammonium phosphate (Climax ® ) [52% P 2 O 3 (22% P); 34% K 2 O (28.2% K)], urea (46% N) (except for N and P trial), sodium borate [Na 2 B 4 O 7 ·10H 2 O (27% B; 18% Na)] and KC (except for K trial) twice per week as foliar sprays to supplement the rest of the elements necessary for the production of good quality tea (Ruan et al, 1999). At the end of each season, all plants were harvested and leaves were freeze dried for N, P, K analyses and tannin assays.…”

Section: Experimental Design and Treatmentssupporting

confidence: 92%

“…Therefore, the results in Figure 5 concur with results of Ruan et al (1999) who reported that P assisted in N metabolism, leading to a significant reduction in substrates available for the formation of hydrolysable tannins and polyphenols during tea shoot growth. Figure 6 indicates that hydrolysable tannins reached a maximum at 200 kg ha -1 K, regardless of season.…”

Section: Hydrolysable Tannin Contentmentioning

confidence: 99%

“…Mudau et al (2007b) reported that total polyphenols in bush tea picked at 200 kg ha -1 K. Ruan et al (1999) reported that the total polyphenols in black and green tea were obtained when K was applied at 150 kg ha -1 during spring and autumn. Young tea shoots contained K at concentrations of 15-25 mg g -1 on a dry mass basis (Ruan, 2005).…”

Section: Hydrolysable Tannin Contentmentioning

confidence: 99%

“…Mineral nutrition is one of the main factors that affects herbal tea quality (Ruan et al, 1999). Owuor and Odhiambo (1994) demonstrated the influence of mineral nutrition on leaf precursor substances that contribute to the quality of black tea.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Chabeli¹,

Mudau

Mashela³

et al. 2008

South African Journal of Plant and Soil

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Section: Experimental Design and Treatmentssupporting

confidence: 92%

Section: Hydrolysable Tannin Contentmentioning

confidence: 99%

Section: Hydrolysable Tannin Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Chabeli¹,

Mudau

Mashela³

et al. 2008

South African Journal of Plant and Soil

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“…Várias pesquisas relatam a importância do potássio no aproveitamento do nitrogênio (Xu et al, 2002;ruan et al, 1998;1999), porém na figura 2 podese observar apenas o efeito do nitrogênio no acúmulo desse nutriente na parte aérea. Tal comportamento pode ser devido ao suprimento de potássio em única dose, não tendo quantidades suficientes em solução na fase de acúmulo e incorporação do nitrogênio no tecido foliar.…”

Section: Acúmulo De Nitrogênio Na Parte Aéreaunclassified

Doses de nitrogênio e potássio no crescimento do trigo

Viana

Kiehl

2010

Bragantia

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RESUMOO fornecimento do potássio para as plantas estimula o aproveitamento do nitrogênio, possibilitando que sua absorção, assimilação, nutrição e, consequentemente, a produtividade, sejam aumentadas. Objetivou-se com este trabalho avaliar o efeito de combinações de doses de nitrogênio e potássio no crescimento e assimilação do nitrogênio por plantas de trigo. O experimento foi realizado em casa de vegetação, utilizando-se vasos com capacidade para 3 kg onde foram acondicionadas amostras da camada 0-0,2 m de um Argissolo Vermelho Amarelo Abrúptico. Utilizou-se um esquema fatorial 5 2 fracionado, com combinações de cinco doses de nitrogênio (0; 70; 140; 210 e 280 mg dm -3 ) e de cinco doses de potássio (0; 50; 100; 150 e 200 mg dm -3 ), as quais foram distribuídas segundo o delineamento experimental de blocos aleatorizados, com quatro repetições. O fornecimento combinado das maiores doses de nitrogênio e potássio incrementou a produção de massa seca da parte aérea e teor de clorofila nas folhas. O acúmulo de nitrogênio e potássio nas folhas foi aumentado apenas pelas doses desses nutrientes separadamente. O potássio não influenciou a atividade da redutase do nitrato e o acúmulo de nitrogênio no tecido vegetal. Palavras-chave:Triticum aestivum L., atividade da enzima redutase do nitrato, leituras SPAD. ABSTRACT RATES OF NITROGEN AND POTASSIUM ON GROWTH OF WHEAT PLANTSThe supply of potassium to plants stimulates the efficient use of nitrogen through plant uptake and assimilation, consequently increasing crop yield. The aim was to evaluate the effect of combined rates of nitrogen and potassium on growth and assimilation of nitrogen in wheat plants. The experiment was performed in a greenhouse, Piracicaba, SP Brazil. Three-liter pots were filled with 0-0.2 m depth samples of Arenic Hapludult. A fractionated 5 2 factorial was used, with combinations of five nitrogen rates (0; 70; 140; 210 and 280 mg dm -3 ) and five potassium rates (0; 50; 100; 150 and 200 mg dm -3 ), which were set in a randomized block design, with four replications. The combination of the highest nitrogen and potassium rates increased shoot growth and the chlorophyll content in leaves. The accumulation of nitrogen and potassium in leaves was increased only by rates of these nutrients separately. The potassium did not influence the nitrate reductase activity and the accumulation of nitrogen in plant tissue.

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Effect of alternative anions (Cl^–vs. SO$ _4^{2-} $) on concentrations of free amino acids in young tea plants

Ruan

Gerendás

Haerdter³

et al. 2007

Z. Pflanzenernähr. Bodenk.

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The quality of green tea is highly dependent on the concentration of free amino acids, whose profile is dominated by the unique amino acid theanine (N 5 -ethyl-glutamine). A high quality is associated with a high amino acid-to-catechin ratio, but previous results indicated that excessive chloride (Cl -) supply is detrimental for amino acid accumulation. Several experiments were conducted to investigate the effect of chloride on growth and concentrations of free amino acids in young tea plants. Soil-grown tea plants supplied with different levels of potassium (K) as K 2 SO 4 or KCl exhibited increased concentrations of free amino acid in young shoots only when supplied with K 2 SO 4 , and the negative effect of KCl supply was mainly due to a reduced concentration of theanine. Concentrations of other nutrients in plant tissues were not influenced. The uptake of Cland its interaction with nitrogen (N) uptake were further investigated in a second experiment, in which soil-cultivated tea plants were supplied with varying amounts of Cl -. Chloride application reduced yield of young shoots, and severity of leaf damage was related to the con-centration of Clin leaves. Nitrogen uptake was reduced by Claddition. To verify whether the decrease of free amino acids was simply a result of inhibited NO À 3 assimilation, a third experiment was conducted, in which tea plants were NH 4 -fed in the absence or presence (equivalent to the NH 4 concentration) of Cl -. Again, concentrations of theanine and total free amino acids in young shoots were reduced by Clsupply, but changes of the free-amino acid pool did not contribute to the maintenance of charge balance. However, concentration of theanine in roots, where it is synthesized, was not influenced by Cl -. Total N concentrations of roots and mature leaves, uptake rate of NH 4 , and activity of glutamine synthetase in fibrous roots and young leaves were all unaffected by Clas well. It is suggested that translocation of theanine from root to shoot and its catabolism in young shoots might be influenced by Cl -.

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Effects of potassium and magnesium nutrition on the quality components of different types of tea

Cited by 68 publications

References 12 publications

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Doses de nitrogênio e potássio no crescimento do trigo

Effect of alternative anions (Cl^–vs. SO$ _4^{2-} $) on concentrations of free amino acids in young tea plants

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Effects of potassium and magnesium nutrition on the quality components of different types of tea

Cited by 68 publications

References 12 publications

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Doses de nitrogênio e potássio no crescimento do trigo

Effect of alternative anions (Cl–vs. SO$ _4^{2-} $) on concentrations of free amino acids in young tea plants

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Effect of alternative anions (Cl^–vs. SO$ _4^{2-} $) on concentrations of free amino acids in young tea plants