نتایج جستجو برای: stand establishment

تعداد نتایج: 101569  

1998
J. C. Burgess

This paper looks at the economics of conversion and fragmentation of forest land. The forestry economics literature has generally focussed on the management of a single stand for timber and non-timber forest benefits with little attention being paid to forest level land use decisions, and in particular forest stand interactions. As noted by Bowes and Krutilla (1989), the focus on a single stand...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعت آب و برق (شهید عباسپور) - دانشکده مهندسی مکانیک 1392

هدف اصلی تست پره توربین بادی، نشان دادن سطح قابل قبولی از اطمینان در مورد این موضوع است که وقتی پره ای بر اساس مشخصات معین تولید میشود، استحکام و طول عمر در نظر گرفته شده در طراحی پره را دارا میباشد. باید نشان داده شود که پره می تواند در برابر هم بارهای نهایی (تست استاتیکی) و هم بارهای خستگی (تست دینامیکی) که در طی طول عمر طراحی خود، انتظار می رود با آن مواجه شود، مقاومت کند. یکی از الزامات اج...

Journal: :Agrosystems, geosciences & environment 2021

Seedbed conditions during corn (Zea mays L.) planting can have substantial impact on stand establishment and final yield. Planting management decisions are complex due to spatial variability caused by changing soil characteristics such as texture or landscape position. Field experiments conducted in central Missouri from 2017 2019 assessed the effects of varying depths Sites included fine- coar...

Journal: :Ecology 2013
Alan J Tepley Frederick J Swanson Thomas A Spies

Forests dominated by Douglas-fir and western hemlock in the Pacific Northwest of the United States have strongly influenced concepts and policy concerning old-growth forest conservation. Despite the attention to their old-growth characteristics, a tendency remains to view their disturbance ecology in relatively simple terms, emphasizing infrequent, stand-replacing (SR) fire and an associated li...

2007
Kathleen Delate

Introduction Organic seed treatments have been limited in organic production, until recently. Agricoat Natural IITM, is reported to be “an organic liquid biological seed treatment applied as a seed film coating and formulated with beneficial microbes, macro and micro nutrients, amino acids, organic acids, enzymes, proteins, vitamins, and minerals.” Natural IITM also is applied to “promote root ...

2010
Howard Skinner Paul R. Adler

Switchgrass (Panicum virgatum L.) is an important bioenergy crop with the potential to provide a reliable supply of renewable energywhile also sequestering C in the soil. The purpose of this studywas to quantify CO2 fluxes during the establishment and early production years of a young switchgrass stand in the northeastern USA. Switchgrasswas sown in June 2004 and daily CO2 fluxesweremeasured fo...

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