Call a random partition of the positive integers partially exchangeable if for each finite sequence of positive integers n l , . . . , nk, the probability that the partition breaks the first nl + . . . § nk integers into k particular classes, of sizes nl . . . . , nk in order of their first elements, has the same value p(na . . . . . nk) for every possible choice of classes subject to the sizes...

A model has been used to simulate potassium (K) uptake by wheat in a pot culture experiment. Three soils from India, namely Alfisol, Inceptisol and Vertisol, were differentially K exhausted by Sudan grass (Surghum vulgare var. Sudanensis) for a period of 280 days and were used to simulate potassium uptake by wheat (Triticum aestivum) and also to predict the amounts of K released or fixed during...

This article notes the geographical location and soil-climatic conditions of Kashkadarya province in Uzbekistan, as well mechanical composition, agrochemical properties dynamics nutrients soil field experiments conducted typical irrigated gray soils Shakhrisabz district. In total, 36% basin are soils, genetic layers studied area medium sandy, with large dust particles predominating fraction cre...

In the Brigalow Belt bioregion of Australia, clearing brigalow (Acacia harpophylla) scrub vegetation for agriculture has altered nutrient cycling over millions hectares. order to quantify effect this and land use change on soil fertility, Catchment Study commenced in 1965. Initial burning resulted a temporary increase mineral nitrogen, total available phosphorus, exchangeable potassium sulfur s...

Stubble burning in Chile is a common practice used for the farmers but it causes nutrient losses, erosion and environmental pollution. An alternative to change this situation incorporation of crop residue improve soil quality. The objective research was compare effects oat stubble on chemical physical properties an Humic Haploxerands with rotation oat-wheat. A completely randomized experimental...

The experiment was carried out to study the relationship between soil calcium conditions and content of this element in fruit leaves apple trees at ground fertilization with nitrogen potassium. experimental orchard is located forest-steppe zone Central Russian Upland (Oryol region). Loamy haplic luvisol a slightly acidic reaction high organic matter. Fruit plantations are represented by ‘Sinap ...

With increasing frequency and intensity of dry spells in the cocoa production zones West Africa, strategies for mitigating impact water stress on seedling survival are urgently required. We investigated effects applied potassium biomass accumulation, physiological processes varieties subjected to pot experiments a gauzehouse facility. Four levels (0, 1, 2, or 3 g/plant as muriate potash) were u...

abstract heated micaceous minerals under different commercial brand names (including vermiculite) are used as culture medium in greenhouses. heating minerals affects the release of elements, such as potassium, by changing their structure. the present study, investigates the ability of alfalfa, as one of the most important fodder around the world, to take up the non-exchangeable and structural p...

The author first reviews, on the basis of personal and literature data, the main changes in three major parameters of potassium metabolism: serum potassium; daily urinary output ofpotassium; exchangeable potassium (Ke) at the three stages of the course of liver cirrhosis. The action of K-sparing diuretics (spironolactone, triamterene, amiloride) on these parameters is analysed. Although the int...

Recent theoretical considerations have played an important role in advancing our understanding of the physiological mechanisms responsible for perturbing the plasma water sodium concentration ([Na(+)](pw)) in health and disease. Central to these considerations is the original empirical relationship between the [Na(+)](pw) and total exchangeable sodium (Na(e)), total exchangeable potassium (K(e)...