abstract use of empirical competition models is one of approaches in integrated weed management strategies. in order to investigation of this approach in simulation of yield loss of bean (phaseolus vulgari. l.) caused by jimson weed (datura stramonium l.) interference, an experiment was conducted in national bean research station, in khomein, in 2007. the experiment design was randomized comple...

Two laboratory and greenhouse experiments were carried out to compare and evaluate the nutrition of Phaseolus vulgaris L. plant with foliar spray and root media. In laboratory, effect of four treatments; N- nutrition solution; Urban solid waste leachate (USWL); vermi-compost extract and control (distilled water) on germination and seeding growth of Phaseolus vulgaris L. was examined for 10 days...

Abstract The purpose of this study was to evaluate the effects furrow fertigation on nitrate deep leaching, runoff losses, and plant nitrogen supply in various growth stages maize ( Zea mays L.). Furrow experiment conducted 120 (W1), 100 (W2), 80 (W3), 60% (W4) levels required water (560 mm) (N1), (N2), 60 (N3), 0% (N4) fertilizer (184 kg N ha −1 ). N-fertilizer applied four split applications ...

Efficient conduction of water inside leaves is essential for leaf function, yet the hydraulic-mediated impact of drought on gas exchange remains poorly understood. Here we examine the decline and subsequent recovery of leaf water potential (Psi(leaf)), leaf hydraulic conductance (K(leaf)), and midday transpiration (E) in four temperate woody species exposed to controlled drought conditions rang...

The relationship between spatial density and size of plants is an important topic in plant ecology. The self-thinning rule suggests a -3/2 power between average biomass and density or a -1/2 power between stand yield and density. However, the self-thinning rule based on total leaf area per plant and density of plants has been neglected presumably because of the lack of a method that can accurat...