Effect of calcium carbonate on ammonium and urea nutrition of young tea plants (Camellia sinensis L.) grown in sand culture

Krishnapillai, S.; Pethiyagoda, U.

doi:10.1007/bf02182705

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…This was to be expected because tea plantations are acidified by the use of fertilizers (e.g., urea and ammonium sulfate) and rhizospheric effects of tea plants (Han et al., 2007). This is mainly because most tea plants grow well in acidic soils and with a pH range from 4.5 to 6.0 (Krishnapillai & Pethiyagoda, 1980). Although soil pH was increased by HTOF treatments, overall, the pH range recorded in this study (4.44–4.82) was suitable for tea cultivation.…”

Section: Discussionmentioning

confidence: 99%

Tea plant growth and soil nutrients in response to the application of fertilizer in Guizhou province, China

et al. 2022

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More than half of the total production of tea [Camellia sinensis (L.) Kuntze] in China is produced in the Guizhou province. However, in this region soils generally have low soil fertility, so new techniques to improve the productivity and fertility are needed. The aim of this study was to evaluate the effects of application of seven types of humic acid‐based organic–inorganic compound fertilizer (HTOF) on tea quality and productivity. Two different cultivars of tea (cultivars Shiqiantaicha and Fudingdabaicha) were used as model plants. In the research, seven different HTOF fertilizers were tested at two sites. Application of the HTOF increased soil pH to a range closer to that most suitable for the growth of tea plants and relatively increased soil organic matter, ammonium‐N, inorganic P, and extractable K. In addition, HTOF increased tea bud weights and density. Application of HTOF‐1 also produced the best responses among all products tested. Findings from this study indicate that formula is recommended for application during the production of young C. sinensis tea plants.

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Section: Discussionmentioning

confidence: 99%

Tea plant growth and soil nutrients in response to the application of fertilizer in Guizhou province, China

et al. 2022

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“…Immature shoots grow vigorously consuming much of the carbohydrates synthesized in the leaf canopy (Wettasinghe et al, 1981) and therefore, termed as a strong 'sink'. Mature leaves supplying carbohydrates are the 'source' (Visser, 1960;Krishnapillai, 1983;Manivel and Hussain, 1986;Wijeratne, 2001;Barman, 2005;De Costa et al, 2007;De Costa et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Impact of Motorized Tea Harvesters on Tea Yield and Yield Determining Parameters

Pathiranage,

Wijeratne,

De Costa

2023

Trop. Agric. Res.

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Motorized tea harvesters vary in shoot cutting & collecting mechanisms and reported considerable yield decline in Sri Lanka. In this study, three non-selective harvesters were used to evaluate the impacts of different cutting & collecting mechanisms on tea yield-determining parameters compared to manual harvesting (control). The machines used were battery-operated Forbes & Walker harvester with helically arranged picking arms (BatFW), battery-operated Kawasaki harvester with reciprocating blades (BatKW), and petrol-driven Kawasaki harvester with reciprocating blades (PetKW). Tea yield, coarse leaf content, operational time, shoot compositions, branch girthing, and root starch content were recorded for one year. The motorized harvesters reduced tea yield by nearly 50% compared to the control. The number of machines required (units/ha/day) were 6, 4 and 2 for BatFW, BatKW and PetKW, respectively, as compared to eight manual pluckers and the corresponding land extents covered were 0.17, 0.25 and 0.47 (ha/unit/day), as against 0.13 in manual. Manual harvesting and BatFW consumed comparable higher worker requirements than the others. The average shoot weight and shoot density were the least affected by BatFW. The highest immature (arimbu) shoot removal was by PetKW. The highest dormant shoot accumulation in the plucking table was by BatFW. Reciprocating blades harvested more productively (700 g/cm/day) than picking arms (500 g/cm/day). All machines affected branch girthing and root starch reserves compared to manual harvesting. The mechanical impacts on yield determining parameters viz., immature shoot removal, accumulated dormant shoots, affected yield components, poor branch development, and depleted root starch reserves collectively resulted the tea yield reduction.

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“…9 -12 The tea plants 13,14 did not absorb Ca, and Ca-containing compounds consequently caused the increase of soil pH. 15 Liming can increase soil pH and soluble Ca concentration and subsequently decrease exchangeable Al and F concentrations. The main objective of the experiment is to determine the effects of liming on the uptake of Al and F of tea plants.…”

Section: Introductionmentioning

confidence: 99%

Application of different forms of calcium to tea soil to prevent aluminium and fluorine accumulation

Fung

Wong

2004

J Sci Food Agric

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Tea Camellia sinensis (L), is a well-known accumulator of aluminium and fluorine from acidic soil. A reduction is desirable as aluminium and fluorine absorbed will leach into the tea liquor through infusion, thus posing a serious threat to the health of consumers. The present study aims to investigate the effects of adding different forms of calcium on Al and F uptake by tea plants, in order to reduce the concentrations of these elements contained in the plants. All true lime materials increased the soil pH and decreased soil extractable Al and F concentrations. There were no (p < 0.05) changes in pH values when CaCl 2 was added, and a slight decrease in Al and F concentrations was observed in the treatments with CaSO 4 . Tea seedlings under the addition of CaSO 4 were the tallest and healthiest, followed by CaCl 2 , CaCO 3 , Ca(OH) 2 and CaO. Seedlings under large doses of Ca(OH) 2 and CaO were dead. Relative growth rates decreased significantly with the increase of calcium compounds except in CaSO 4 treatment. The highest Al concentration was also found in the treatment of 4000 mg CaSO 4 kg −1 ; it then decreased gradually from 3364 to 933 mg Al kg −1 in leaves. For all treatments in both varieties, F concentrations in leaves were lower than the control (374 mg kg −1 ). Calcium chloride was a suitable agent for reduction of Al and F uptake by tea plants while maintaining a high growth rate of the seedlings.

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Effect of calcium carbonate on ammonium and urea nutrition of young tea plants (Camellia sinensis L.) grown in sand culture

Cited by 6 publications

References 5 publications

Tea plant growth and soil nutrients in response to the application of fertilizer in Guizhou province, China

Tea plant growth and soil nutrients in response to the application of fertilizer in Guizhou province, China

Impact of Motorized Tea Harvesters on Tea Yield and Yield Determining Parameters

Application of different forms of calcium to tea soil to prevent aluminium and fluorine accumulation

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