in order to study the effects of sowing date and plant density on forage yield and some morphological characteristics of corn, an experiment was conducted in gorgon research station in 2008. in this experiment two sowing date (18 april and 21 june) and six plant densities (25000, 45000, 65000, 85000, 105000, and 125000 plant per hectare) were evaluated in form of factorial experiment (2×6) with...

the aim of this study was to evaluate the effects of different levels of citrus limon essential oil on nutrient digestibility, blood and ruminal metabolites in male holstein calves. this study were conducted using four male holstein calves, each fitted with a permanent rumen cannula (average body weight 650±20 kg) that received experimental diets including control with 600, 800 and 1000 mg/d le...

this research was carried on to evaluate the response of rapeseed varieties to salt stress. in this experiment growth response of three rapeseed varieties (fornex, consoul and okamer) in four salinity levels (0, 40, 80 and 120 mmol nacl) was investigated using a factorial arrangement of factors in a complete randomized block design with three replications. results incicated that in the highest ...

abstract planting of olive (olea europaea l.) tree due to salt and drought tolerance and ever green habit increasingly is considered in urban landscape in recent years. the low resistance to cold has been a major problem in using this tree in temperate and cold zones. so, determination of frost resistance cultivars is one of the important measures for use of this tree in urban landscape. to eva...

in order to evaluate the influence of different sowing dates on quantitative and qualitative yield in four winter rapeseed cultivars (brassica napus l.), two field experiments were carried out as split plot arrangement in complete block design with four replications. this research was performed in agricultural experimental station of agricultural and natural resources research center of markazi...

Abstract An incomplete-block design defines both a concurrence graph and Levi graph. Properties of either can be used to compare designs with respect D-optimality A-optimality. In this paper, we show that optimality the implies strong conditions on connectivity properties graph, use classify optimal when number observational units is close minimal.