use as fungicides: potassium silicate ( Bekker et al., 2006 ), calcium acetate ( Palou et al., 2002 ), and calcium propionate ( Aguayo et al., 2008 ; Arroyo et al., 2005 ; Biggs, 1999 , 2004 ; Biggs et al., 1997 ; Blogdett et al., 2002
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.”
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.
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
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
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
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
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
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
production ( Kafkafi and Tarchitzky, 2011 ). Potassium deficiency in northern highbush blueberry varies among soil types and production regions. Factors contributing to K deficiency include poor soil drainage, drought, low soil pH (<4), and heavy crop loads