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- W2563706490 abstract "The maintenance of pH in unbuffered nutrient solutions has important consequences for the hydroponic industry and proposed nutrient delivery systems for plants in space. The requirement for charge balance by a model plant system, dwarf wheat ( Triticum aestinum cv. Yecora rojo), is largely a function of the uptake ratio of four cation species ( batchmode documentclass[fleqn,10pt,legalpaper]{article} usepackage{amssymb} usepackage{amsfonts} usepackage{amsmath} pagestyle{empty} begin{document} (mathrm{NH}_{4}^{+}) end{document} , Ca 2+ , and Mg 2+ ) and two anion species ( batchmode documentclass[fleqn,10pt,legalpaper]{article} usepackage{amssymb} usepackage{amsfonts} usepackage{amsmath} pagestyle{empty} begin{document} (mathrm{NO}_{3}^{-}) end{document} and batchmode documentclass[fleqn,10pt,legalpaper]{article} usepackage{amssymb} usepackage{amsfonts} usepackage{amsmath} pagestyle{empty} begin{document} (mathrm{SO}_{4}^{2-}) end{document} ) up to anthesis. The change in electrical conductivity (EC) and pH of the nutrient solution over time integrates the overall influx:efflux process of the plants. Solutions with three different NH 4 :NO 3 ratios were sampled at 15-min intervals over a 12-h period at 9, 10, 16, 17, 23, 24, 37, and 38 days after planting. Exhaustion of N in the solution at all stages of ontogeny resulted in a 2- to 3-fold reduction in ΔpH/Δt, despite high plant tissue N and irrespective of the concentration of other charge balance ions in solution. These data, combined with a plant nutrient uptake database (normalized for plant relative growth rate per mole PPF), suggest that a system can be developed to control pH by direct supply of various alternative nutrient stock solutions, rather than by the addition of H + or OH – from acid or base." @default.
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- W2563706490 date "1995-07-01" @default.
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- W2563706490 title "The Maintenance of Charge Balance and pH in Hydroponic Solutions by Stock Nutrient Addition: A Possibility?" @default.
- W2563706490 doi "https://doi.org/10.21273/hortsci.30.4.790f" @default.
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