Models to estimate phytomass accumulation of hydroponic lettuce
نویسندگان
چکیده
منابع مشابه
Application of Mathematical Models to Estimate Metabolizable Energy Contents of Energetic Concentrate Feedstuffs for Poultry
A study using 51 wheat, 56 barley and 34 oat grain samples was conducted to investigate the feasibility of predicting the apparent metabolizable energy (AME) value of these cereals for poultry. Stepwise regression analyses were performed to evaluate the relationship of AME with starch, ether extract (EE), crude fiber (CF), soluble sugar (SS), ash and crude protein (CP) (for wheat and barley gra...
متن کاملDEVELOPMENT OF NEURAL NETWORK MODELS TO ESTIMATE LATERAL-DISTORTIONAL BUCKLING RESISTANCE OF CELLULAR STEEL BEAMS
The lateral-torsional buckling (LTB) strength of cellular steel girders that were subjected to web distortion was rarely examined. Since no formulation has been presented for predicting the capacity of such beams, in the current paper an extensive numerical investigation containing 660 specimens was modeled using finite element analysis (FEA) to consider the ultimate lateral-distortional buckli...
متن کاملComparison of Land, Water, and Energy Requirements of Lettuce Grown Using Hydroponic vs. Conventional Agricultural Methods
The land, water, and energy requirements of hydroponics were compared to those of conventional agriculture by example of lettuce production in Yuma, Arizona, USA. Data were obtained from crop budgets and governmental agricultural statistics, and contrasted with theoretical data for hydroponic lettuce production derived by using engineering equations populated with literature values. Yields of l...
متن کاملEffects of Ammonium Nitrogen on Lettuce Grown on Pumice in a Closed Hydroponic System
Two successive lettuce crops were grown in spring 2005 in a completely closed hydroponic system. The ratio of ammonium to total nitrogen (Nr) in the fresh nutrient solution (FNS) introduced into the closed system to compensate for plant uptake was 0, 0.1, 0.2 and 0.3 on amolar basis. In allNr treatments, the concentrations of total N, K, Ca, Mg, P, and micronutrients in the FNS were identical, ...
متن کاملA new estimate of tundra-biome phytomass from trans-Arctic field data and AVHRR NDVI
A new estimate of tundra-biome phytomass from trans-Arctic field data and AVHRR NDVI Martha K. Raynolds a , Donald A. Walker a , Howard E. Epstein b , Jorge E. Pinzon c & Compton J. Tucker c a Institute of Arctic Biology, University of Alaska, Fairbanks, AK, 99775, USA b Department of Environmental Sciences, University of Virginia, Charlottesville, VA, 22904, USA c Biospheric Science Branch, NA...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Scientia Agricola
سال: 2004
ISSN: 0103-9016
DOI: 10.1590/s0103-90162004000400007