We evaluated evenand uneven-aged silvicultural options for slash pine (Pinus elliottii Engelm.) using empirical data and the Forest Vegetation Simulator (FVS) model. Data were collected from a mature unthinned slash pine plantation in a flatwoods site in Florida, and used to simulate six scenarios of evenand uneven-aged silvicultural regimes applied to slash pine stands, including a no-action o...

Composted municipal solid wastes (CMSW) could potentially be used as a mulching material to control runoff and soil erosion. The effects of mulching with CMSW on water percolation and rate of compost decomposition were studied using laboratory rainfall simulator. Samples of typical loess soil (Calcic Haploxeralf) were packed in boxes and either covered with 0, 100,200 and 300 m' ha-' of CMSW, o...

A field experiment (randomized complete block, factorial) was conducted during 2009 and 2010 in newly reclaimed sandy soil, New Valley of the western desert, Egypt to assess the interaction effects of potassium and farmyard manure (FYM) application on growth and soil properties of forage cowpea (Vigna unguiculata L. local variety). Factors and treatments are: K-application rate: 0, 48, 96 and 1...

A long term study was done to assess the impact of on farm reservoirs (OFR) on oil seedand cereal based cropping systems with vegetables (okra, tomato and carrot) in semi-aridalfisol of southern Telangana region. Two supplemental irrigation (SI) depths (30 and 50 mm)from OFR with raingun system were studied for assessing the water productivity andprofitability of the technology in these croppin...

this research was conducted at torogh agricultural research station in khorasan-e razavi province to determine the impact of irrigation cutoff at different growth stages and percentage of water use on the yield and water use efficiency (wue) of wheat cultivars using sprinkler irrigation. the study was done from 2006-2008. the experimental design was a randomized complete block design with a str...

Trace metals like copper (Cu) and zinc (Zn) are added to animal feed as dietary supplements, and trace metals not assimilated by the animals gut are excreted in manure. The accumulation and movement of Cu and Zn in soils has not been as well documented when compared to nitrogen (N) and phosphorus (P). In cases where plant−available Cu and Zn concentrations accumulate to phytotoxic levels, yield...

Little information is available on the effects of applying compost tea to species in dry regions. Compost from agricultural waste can promote drought resistance in plants and increase their growth by improving soil structure and providing nutrients and enhancing the capacity of the soil to store moisture. In order to examine these effects, compost tea was tested on two species growing in dry re...

The effects of factorial combinations of post-thinning density (6, 11, and 16 stems per hectare [sph]) and repeated fertilization on the growth and development of young lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) were investigated in central British Columbia. After 14 years, the effects of density and multi-nutrient fertilization (applied at , 5, and 1 years) on tree h...

shortage of water resources and increasing demand to consumption of this scarce resource, leads to somenoticeable limitations. on the other hand, population growth and consequently, increasing demand for water in aridand semi arid regions , needs production in exchange of little amount of water consumption. to approach thisobjective, an experiment in the complete randomized blocks carried out i...

Old-growth forests have been noted for containing significant quantities of deadwood. However, there has been no coordinated effort to quantify the deadwood component of old-growth remnants across large regions of temperate deciduous forest. We present results of a regional inventorythatquantifies and examines regional and temporal trends fordeadwood in upland old-growth forest remnants within ...