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Enoc Barrera-Aguilar, Luis A. Valdez-Aguilar, Ana M. Castillo-González, Andrew D. Cartmill, Donita L. Cartmill, Edilberto Avitia-García, and Luis Ibarra-Jímenez

Potassium plays a key role in plant growth and physiology, specifically in the activation of enzymes, stomata regulation, plant water relations, and mobility of ions and other solutes within the plant ( Mengel and Kirkby, 2001 ). Potassium

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Manman Wang, Youliang Ye, Xv Chu, Yanan Zhao, Shuhong Zhang, Hui Chen, Wei Qin, and Yang Wang

2 O 2 . The total nitrogen (N) and phosphorus (P) concentration of the digested samples was determined using an automated continuous flow analyzer (Seal, Norderstedt, Germany). The total potassium (K) concentration of the plant was determined with a

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Chang-Tsern Chen, Ching-Lung Lee, and Der-Ming Yeh

23 °C, as recommended for Eustoma growth ( Harbaugh, 1995 ; Harbaugh and Woltz, 1991 ; Islam et al., 2004 ). Table 1. Nutrient formulations used to induce nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), or magnesium (Mg) deficiencies in

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Roger P. Humbert

Abstract

Potassium is required by most plants in amounts greater than any other nutrient. The functions of potassium are many-it is known to be required for cell structure, carbon assimilation, photosynthesis, protein synthesis, starch formation, translocation of protein and sugars, the water balance in plants, normal root development and many other life processes. Fig. 1 illustrates some of the many functions of potassium in plant life.

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Michael W. Smith and Becky S. Cheary

’er and Kessler, 1984 ). Accumulated shuck K acts to increase shuck hydration assisting in shuck opening ( Pallardy, 2008 ; Thor and Smith, 1935 ). Potassium shortages have been associated with leaf margin chlorosis/necrosis and partial defoliation

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Ivan dos Santos Pereira, Luciano Picolotto, Michél Aldrighi Gonçalves, Gerson Kleinick Vignolo, and Luis Eduardo Corrêa Antunes

major constraint toward improving productivity. Potassium performs various structural and metabolic functions in the plant. It has an important role in regulating the ψ S of cells, and thus acts as an activator of many enzymes involved in respiration

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Timothy K. Broschat

(P), potassium (K), and other elements ( Broschat, 2009 ; Poole and Conover, 1985 ). On the other hand, the highly leached, low cation-exchange capacity, sandy soils that predominate in the coastal plain of southeastern United States are typically

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Augusto Ramírez-Godoy, María del Pilar Vera-Hoyos, Natalia Jiménez-Beltrán, and Hermann Restrepo-Díaz

., 2016 ). In this context, foliar Si applications increased the mortality of tobacco whitefly nymphs on cucumber ( Cucumis sativus ) ( Correa et al., 2005 ). Soil fertilization with calcium (Ca) or potassium silicate favored resistance to arthropods in

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Elvia Hernández-Gómez, Luis A. Valdez-Aguilar, Ana M. Castillo-González, María T. Colinas-León, Donita L. Cartmill, Andrew D. Cartmill, and R. Hugo Lira-Saldívar

cations, particularly K ( Marschner, 1995 ). Potassium is a highly abundant cation in plants and has a significant effect on N nutrition. Potassium affects NO 3 – uptake by being a counteranion for NO 3 – translocation from the root to the shoot

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Michael W. Smith

2 are protogynous. Potassium and P are phloem-mobile macronutrients ( Marschner et al., 1996 ) that are readily translocated from leaves to developing pecan fruit ( Sparks, 1977 , 1988 ). Potassium functions in osmoregulation, carbohydrate