The pasture and forest land use change to agricultural use can effect on many properties of the soil and its productivity. The present research aims to investigate various forms of K (soluble, exchangeable, non-exchangeable, and structural forms) and some soil properties in different land use of three areas including Choram, Kakan and Bahmaei in Kohgiluyeh and Buyer-Ahmad Province. Four profile...

Natural zeolites are abundant and inexpensive resources. They crystalline hydrated aluminosilicates with a framework structure that has pores channels occupied by water, alkali, alkaline earth cations. Having high cation exchange capacity, acting as molecular sieve, natural have been widely utilized in recent decades adsorbents separation purification processes. Modification of zeolite increase...

A study was conducted to evaluate the effects of liming materials on growth rice under rainshelter conditions and MR 219 variety used in this experiment. The treatments were: 1) T1, no application lime, 2) T2, 4 t ha-1 ground magnesium limestone (GML), 3) T3, 2 hydrated 4) T4, 20 L liquid lime. It found that GML had produced highest yield 8.2 ha-1. result showed as panicle length increase, spik...

A sequence of random variables is exchangeable if its joint distribution is invariant under variable permutations. We introduce exchangeable variable models (EVMs) as a novel class of probabilistic models whose basic building blocks are partially exchangeable sequences, a generalization of exchangeable sequences. We prove that a family of tractable EVMs is optimal under zeroone loss for a large...

Acid deposition and repeated biomass harvest have decreased soil calcium (Ca) availability in many temperate forests worldwide, yet existing methods for assessing available soil Ca do not fully characterize soil Ca forms. To account for discrepancies in ecosystem Ca budgets, it has been hypothesized that the highly insoluble biomineral Ca oxalate might represent an additional soil Ca pool that ...

A random partition of the positive integers is called partially exchangeable if for each finite sequence of positive integers n,, ... , nk, the probability that the partition breaks the first n1 + + nk integers into k particular classes, of sizes nl,.. . ., nk in order of their first elements, has the same value p(nl,...,nk) for every possible choice of classes subject to the sizes constraint. ...

Consider a (possibly infinite) exchangeable sequence X= {Xn : 1≤ n < N}, where N ∈ N ∪ {∞}, with values in a Borel space (A,A), and note Xn = (X1, . . . ,Xn). We say that X is Hoeffding decomposable if, for each n, every square integrable, centered and symmetric statistic based on Xn can be written as an orthogonal sum of n U statistics with degenerated and symmetric kernels of increasing order...