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
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
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
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
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.
’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
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
(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
., 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
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