Based on the hypothesis that soil properties and productivity components should be affected by different tillage methods, field laboratory experiments were conducted to study effects of zero (ZT), one pass disc plough (P), plus harrow (PH) two passes (PHH) distribution bulk density, available water capacity, pH, organic matter, phosphorus, iron oxide aluminium at depths, their productivity. The...

The productivity change of a decision making unit (DMU) between two time periods can be evaluated by the Malmquist productivity index. In this study, we propose a method to compute the Malmquist productivity index in several time periods (from the first to the last periods) on interval data in data envelopment analysis (DEA). Then, the obtained Malmquist productivity index is compared with Malm...

background: the purpose of this research is to establish the ability of employees by work ability index (wai), physical work capacity (pwc), and finding the correlation between them . establishing the pwc index with attention to wai values for the purpose of saving in costs and time of pwc measurements is another aim of this project. methods: the present research is an analytic cross-sectional ...

in order to investigate the indices of drought tolerance, correlation coefficient and path analysis at deficit irrigation and nitrogen experiment, this experiment was conducted as split plot arranged in a randomized complete block design (rcbd) with three replications during 2000-2003 for wheat at maragheh agricultural research station of dari. the treatments were included four levels of defici...

This study examines the productivity changes of decision making units in situation where input price vectors are varying between them and inputs are heterogeneous; that is a noncompetitive market. We present a directional measure of cost Malmquist productivity index where incorporates the decision maker's preference over productivity change over time. A simple numerical example is designed to i...

Undesirable outputs are often produced together with desirable. This joint production of good and bad outputs bring about a difficulty for productivity measurement. Here we introduce a directional distance function and use it as a component in a new productivity index. This index, as an empirical example shows, seems to solve the problem caused by the joint production of good and bad outputs. P...