fertilization on shoot and fine root growth of Pinus ponderosa Dougl. ex P. Laws. and C. Laws. grown in native soil in open-top field-exposure chambers at Placerville, CA, over a 2-year period. The experimental design was a replicated 3 × 3 factorial with the center treatment missing; plants were exposed to ambient (~365 μmol mol) air or ambient air plus either 175 or 350 μmol mol CO2 in combin...

in order to study of yield, growth index and physiological traits in spring sugar beet genotypes with delayed planting date, a field experiment was carried out in chenaran in khorasan razavi province in the east of iran in 2008 cropping season. for this experiment a complete randomized block design with 4 replications and 6 treatments was used. the experimental treatments were six improved vari...

To further development of a simplified fertigation system using controlled-release fertilizers (CRF), we investigated the effects of differing levels of fertilizers and plant density on leaf area index (LAI), fruit yields, and nutrient use in soilless tomato cultures with low node-order pinching and high plant density during spring-summer (SS), summer-fall (SF), and fall-winter (FW) seasons. Pl...

an experiment was conducted in order to evaluate the effects of humic acid spraying on  grain yield and yield components of wheat, in agricultural research and natural resources center of tehran province, in 2010-11. a split-plot layout within randomized complete block design with three replications were used. main plots were three irrigation treatments contains of normal irrigation, non-irriga...

whitening as one of the stages in rice processing is performed following dehusking. studies on performance of milling machines prevailent in mazandaran province, as the biggest rice producer province in iran, are essential and helpful in reducing rice losses. a research was undertaken to examine the effects of variety (tarom, hibrid, and fajr), milling machine (frictional and abrasive baed mill...