this fertility experiment was carried out using split plots based on a randomized complete block design of three replications in 2006 at sari agricultural sciences and natural resources university. the aim of the experiment was to investigate some macronutrient and micronutrient accumulation in leaves of different soybean cultivars as influenced by some organic fertilizer types and levels. main...

This paper presents an empirical analysis of the value of a coordinated market exchange mechanism. I present a model of e cient trading mechanisms under uncertainty, and develop a measure of the value of an inter rm trade agreement in the context of sequential `buy-versus-produce' decisionmaking by rms. The theory is applied to estimate the value of a formal trading institution in the Californi...

We prove the conjecture of Abbott and Katchalski that for every m ≥ 2 there is a positive constant λm such that S(K d mn) ≥ λmnS(K m ) where S(K m) is the length of the longest snake (cycle without chords) in the cartesian product K m of d copies of the complete graph Km. As a corollary, we conclude that for any finite set P of primes there is a constant c = c(P ) > 0 such that S(K n) ≥ cnd−1 f...