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S. MacCallum King

Abstract

The excellent papers presented in this Symposium show us the scope of the subject, “Potassium in Horticulture.” Some questions have been answered, but there are still more that require answers. Some will be asked in this “summary statement.”

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C. G. Forshey

Abstract

Leaf symptoms of K deficiency in grapes were described as early as 1894, but this nutritional disorder was not identified in deciduous fruits until 1928. It is the most common nutritional problem of grapes and all other deciduous fruits require K fertilization under certain soil conditions. Potassium deficiency is frequent on light, sandy soils low in K, on heavy soils with a high fixing power, and on calcareous soils. On susceptible soils, it is often associated with heavy production.

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Tracie K. Matsumoto, Mike A. Nagao, and Bruce Mackey

alleviated by the discovery of potassium chlorate (KClO 3 ) to induce off-season flowers and fruits worldwide ( Choo, 2000 ; Manochai et al., 2005 ; Nagao and Ho-a, 2000 ; Sabhadrabandhu and Yapwattanaphun, 2001 ; Yen et al., 2001 ). Application of KClO 3

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Raquel Gomez and Lee Kalcsits

to leaves ( de Freitas et al., 2011 ; Falchi et al., 2017 ). The interaction of other elements like potassium and magnesium have been implicated in the induction of bitter pit ( de Freitas and Mitcham, 2012 ). Potassium is directly involved in cell

Free access

Baomei Yang, Guoliang Li, Shaohai Yang, Zhaohuan He, Changmin Zhou, and Lixian Yao

year and consumes a large amount of nutrients in its growth and fruitage period. Potassium and nitrogen are two mineral nutrition elements required most in normal litchi growth and development ( Yao et al., 2009 ). However, Chinese litchi orchards are

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Timothy K. Broschat and Kimberly Anne Moore

the southern Atlantic coastal plain, nutrient deficiencies are common and corrective or prophylactic fertilization may be needed ( Gilman, 1987 ; Gilman et al., 2000 ). Palms (Arecaceae) in particular, which have high potassium, magnesium, and

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Arnon Dag, Ran Erel, Alon Ben-Gal, Isaac Zipori, and Uri Yermiyahu

survival, and consequential total propagation rates. Table 3. Effect of stock plant potassium (K) fertilization on rooting percentage, cutting survival, and the consequential total prorogation rates. In Jan. 2010, shoots were cut from the experimental trees

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Luis A. Valdez-Aguilar, David William Reed, and John A. Cornell

mixtures of Na 2 SO 4 , K 2 SO 4 , and Rb 2 SO 4 ). The mixtures with 7.5 m m HCO 3 – had the same composition, except for S (14 mg·L −1 ). All the nutrient solutions contained micronutrients as reported previously in the preculture solution. Potassium

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Sofia Caretto, Angelo Parente, Francesco Serio, and Pietro Santamaria

released new “high-pigment” tomato cultivars characterized by higher content of the antioxidant lycopene. These cultivars have not been thoroughly investigated as far as cultivation requirements are concerned. Potassium (K) is the most efficient cation

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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