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- W2493095947 abstract "Nutritional status of vegetable crops is often monitored by analysis of dried plant tissues, which is costly and often time consuming. Two greenhouse trials were conducted, at the University of Hawaii at Manoa, Magoon facilities, to evaluate the portable cardy ion meter (CIM) in determining potassium (K+) status in fresh petiole sap of pak choi as compared with standard laboratory methods. In the first greenhouse trial, three algae species (Gracilaria salicornia, Kappaphycus alvarezii, and Eucheuma denticulatum) were used to apply five rates of K+ (0, 84, 168,252, and 336 kg.ha−1). The pak choi was directly seeded into 4 L pots and was grown in peat moss. In the second greenhouse trial, K+ was provided through Eucheuma denticulatum and potassium nitrate (KNO3) at five rates (0,112, 168, 224, 280, and 336 kg.ha−1) in peat moss and soil media. At harvest, K+ concentrations in fresh petiole sap were analyzed immediately with CIM and the dried samples were analyzed by inductively coupled plasma spectroscopy (ICP) measurement. The results showed increase in leaf K+ content at higher rates and the maximum concentration of leaf K+ at 4500–5300 mg/L for sap and 8–9% for tissue was obtained when K+ was provided between 224 and 284 kg.ha−1. There was a close correlation between the CIM readings and the ICP method (r = 0.8048 and 0.8314) from the first and second GH results, respectively. The results suggest that the CIM could be used for the rapid monitoring of the relative K+ status of plants. The data further suggested 4500–5000 mg K/L for fresh petiole sap and 7.5% K+ in tissue as critical levels for K+ concentration in pak choi." @default.
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- W2493095947 date "2016-07-19" @default.
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- W2493095947 title "A Correlation of Rapid Cardy Meter Sap Test and ICP Spectrometry of Dry Tissue for Measuring Potassium (K<sup>+</sup>) Concentrations in Pak Choi (Brassica Rapa Chinensis Group)" @default.
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- W2493095947 doi "https://doi.org/10.1080/00103624.2016.1208752" @default.
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