Search Results

You are looking at 1 - 10 of 5,478 items for :

  • Refine by Access: All Content x
Clear All

Changes in the K, Ca and Mg contents of the soil solution were examined during the growing period to characterize the nutrient buffer capacity of sandy and clay loam soils in pot experiments set up with Italian ryegrass as indicator plant.  K, Ca and Mg concentrations in the soil solution decreased during the growth due to the nutrient uptake by plants. The normalized values of decrease (expressing the change in the concentration of the given element during unit time) were close to each other for Ca and Mg, while there was a significant difference between the sandy and clay loam soil in the case of K (0.65 and 0.11, respectively). We assumed that the normalized value was inversely proportional to the nutrient buffer capacity of soils.  For the comparison of experiments conducted under different conditions the UPI (uptake index) values were introduced. The UPI value shows to what extent the amount of the given ion calculated from concentration decrease in the soil solution accounts for the amount of element taken up by the plant. The amount of K depleted from the soil solution was 19% of the K amount taken up on the sandy soil, while on the clay loam this value was only 0.8%. Because the UPI values from experiments under different environments are comparable, they characterized the nutrient buffer capacity of soils better than the normalized values of decrease. 

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: Vittorio Berbenni, Chiara Milanese, Giovanna Bruni, Alessandro Girella, and Amedeo Marini

Introduction In the system MgO–SnO 2 the existence of two compounds has been assessed: Mg 2 SnO 4 is a stable phase while the compound MgSnO 3 that has also been reported [ 1 ] is deemed to be stable at temperature not

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: Alexandre Berche, Pierre Benigni, Jacques Rogez, and Marie-Christine Record

additive elements. It has already been shown in literature that addition of zinc and rare earths (RE) can strongly improve these properties [ 1 – 3 ]. Thus, the study of the RE–Mg–Zn systems arouses interest. The determination of the most pertinent

Restricted access

Introduction Although magnesium and its alloys are the lightest materials, they suffer from low strength, low ductility, and poor corrosion resistance. Therefore, amorphous Mg-based alloys have been developed to improve tensile

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: Tomohito Kameda, Yuki Fubasami, and Toshiaki Yoshioka

Introduction Mg–Al layered double hydroxide (Mg–Al LDH) is represented by the formula [Mg 1− x 2+ Al x 3+ (OH) 2 ](A n − ) x / n · m H 2 O, where A n − is an anion, such as CO 3 2− or SO 4 2− , and x is the Al/(Mg + Al

Restricted access

inorganic oxidizers and fuels [ 1 , 2 ]. Potassium perchlorate (KClO 4 ) has long been a main oxidizer in many civil/military pyrotechnics for its mild phase transition, moderate sensibility, and fast ignitability [ 3 – 5 ]. Magnesium (Mg) powders are

Restricted access

fractionation of Mg 2+ (aq), Ca 2+ (aq), and Fe 2+ (aq) with carbonate minerals Geochim. Cosmochim. Acta 74 6301 6323 . W

Restricted access

breast cancer (MCF-7) and human osteosarcoma (MG-63) cells through evaluation of the expression levels of the BAX , P53 and BCL-2 genes and the activity levels of caspase-3, 8 and 9 as well as detecting cell nuclear morphology alterations and

Restricted access

, both the World Health Organization (WHO) and the Environmental Protection Agency (USEPA) recommend a maximum nitrate concentration of 10 mg/L (calculated based on nitrogen) in drinking water [ 3 , 4 , 7 ]. Additionally, the demand for water is

Restricted access

. We are currently investigating the Cu–Li–Mg–H system. The lighter and cheaper metals and our recent discovery that hydrogen can be reversibly stored in these compounds make them a very attractive alternative to lanthanide-based systems. CuMg 2

Restricted access