in order to investigate the effects of humic acid on three tomato varieties, a field experiment was conducted as a split-plot design experiment based on randomized complete block design (rcbd) with 3 replications in ahmad abad part in khorasan razavi, during 2009-2010 .two factorial combinations were four levels of humic acid (0, 1, 1.5, and 2 kg.ha-1) and three tomato varieties (super ch, este...

abstract wenner direct contact method is a method of estimating apparent electrical conductivity (eca) of agricultural soils in situ. this method can be affected by factors such as quality of electrodes in contact with soil, type of employed electric current, moisture content, clay content and compaction of soil. in this research, the effect of electrode type (rod and plate) and electric curren...

abstract the objectives of this research was to evaluate the rhizospheric effects of wheat (triticum aestivum l.) on the status of various inorganic p fractions and total organic p in 10 calcareous soils amended with 1% (w/w) municipal sewage sludge from the refinery of shahrekord city under rhizobox conditions. thus, wheat plant was planted in completely randomized design with three replicatio...

determination of cardinal temperatures during seed germination and emergence as well as the thermal time requirement for each stage is essential in crop management and modeling of plant growth and development. two experiments were conducted to predict cardinal temperatures and thermal time requirement for germination and emergence of chickpea genotypes. in the first experiment, seed germination...

the application of organic amendments can be an appropriate solution to reclaim and improve physical propertiesof saline-sodic soils. in this research, an experiment was performed under greenhouse conditions to study the effect ofamendments to the physical properties of loamy saline-sodic soil. the five treatments were control (withoutamendment), municipal solid waste compost (mc), vermicompost...

this study was performed in year 2010 to evaluate the effect of locality and date of collection on germination and growth of pimpinella aurea dc. seed. the experiment was a factorial one, based upon a completely randomized design of four replications. seeds were collected from three localities in tehran province (tochal, vardavard and lavasanat), at their initial developmental and fully develop...