Loblolly (Pinus taeda L.) and shortleaf (P. echinata Mill.) pine seedlings are frequently top damaged during their frst few years by browsing animals, insects, or forestry operations, but little quantitative information exists on the factors affecting recovery. Thus, we conducted two separate studies to evaluate potential recovery of seedlings from top damage under controlled conditions. The fi...

Increasing use of frozen storage in nurseries at northern latitudes calls for thawing methods that are safe, economical and easy to apply on a large scale. The easiest and most economical method would be to thaw seedlings in the same boxes they were stored in. However, doing this safely requires more knowledge about how long and at what temperatures seedlings should or can be kept in the boxes ...

Objective: To evaluate biostimulants and cultural practices for floral induction in Persian lime (Citrus x latifolia Tanaka ex Q. Jiménez) to obtain production during the winter season, when highest price market is offered with. Design/methodology/approach: From July September period, were applied six-year-old trees with different treatments as follows: 1. Pruning only, 2. + urea, 3. urea ringi...

While there is strong evidence for hydraulic redistribution (HR) of soil water by trees, it is not known if common mycorrhizal networks (CMN) can facilitate HR from mature trees to seedlings under field conditions. Ponderosa pine (Pinus ponderosa) seedlings were planted into root-excluding 61-microm mesh barrier chambers buried in an old-growth pine forest. After 2 yr, several mature trees were...

the impacts of salicylic acid and silicon on some physiological parameters of maize seedlings in the presence ofcadmium (100 μm) were investigated. inhibitory effects of cadmium on seedling growth resulted in reduced shoot and root fresh weight, low percentage of relative water content, low chlorophyll, free proline and soluble sugars contents and a low rate of lipid peroxidation. results indic...

-Despite evidence of its economic impact, very little is known about transplant shock. This study was designed to evaluate transplant shock in relation to root volume and soil water content for two year-old Douglas-fir seedlings. Preliminary results found that new growth decreased and days to budbreak increased with higher moisture stress. This effect was most pronounced for high root volume se...

In a greenhouse study, decontamination capacity of the species Polypogon monspoliensis was investigatedfor detoxification of petroleum-polluted soils caused by sewage and waste materials of Tehran Petroleum Refinery. For this purpose, the amount of total oil and grease before and 45 days after transplanting one-month-old seedlings in the soils of five different treatments were measured. Polluti...

Crop plants are negatively affected by heavy metals. Chromium is also a metal that harms crops. This study aims to examine the effects of several chromium treatments on germination and physiological processes barley seedlings. A Petri culture experiment was performed accomplish this purpose. In experiment, sterilized seeds were sown in dishes lined with Whatman No. 1 filter paper triplicate. Fi...

Rhazya stricta. an evergreen poisonous shrub is rapidly invading large areas of rangelands in Saudi Arabia. A laboratory study was conducted to investigate the effect of its dry foliage leachate on seedling growth and survival of some range plants including R. stricta its self at different stages of seedling growth. Results indicated that seedlings were more susceptible to allelopathic effects ...