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结果 1-10 的 2,034
Sustaining agricultural production in Africa
1990
Okigbo, B.N.
Neuabgrenzung landwirtschaftlicher Produktionsgebiete in Österreich = | Adjustment of agricultural production zones in Austria
1990
Wagner, Klaus
Feedlot manure in agricultural production
1990
Araji, A. A. | Stodick, L.
[The agrometereology in the agricultural production]
1990
Salvo, R.
Research on agricultural production in Hungary
1990
Kim, J.M. (Sungkyunkwan Univ., Suwon (Korea Republic). Coll. of Agriculture)
[Tendencies of technical development in the agricultural production]
1990
Schoen, H. (Bundesforschungsanstalt fuer Landwirtschaft, Braunschweig (Germany). Inst. fuer Betriebstechnik)
Agricultural wastes for livestock production in the Philippines
1990
Alcasid, R.N. (Bureau of Animal Industry, Quezon City (Philippines). Dept. of Agriculture)
Consideration on the energy consumption in agricultural production
1990
Blazek, M. | Wielicki, W. (Akademia Rolnicza, Poznan (Poland). Katedra Ekonomiki i Organizacji Rolnictwa)
The results of long term studies and investigations on energetical effectiveness of various crops are given together with analysis of 10 rotation schemes which are to constitute an attempt at applying energy consumption research to rationalization of production structure. The scope of studies involves direct accumulated energy input reflecting energy consumption in plant production. The investigated object were large acreage state farms located in Wielkopolska region, Poland. The results obtained prove that plant production has a positive energy balance. It seems that in the average farming conditions one should try to obtain 3-5 energy units of the product from 1 input energy unit. This calculation, however, is too optimistic since it does not include the energy input due to general input. If the general input is assumed to be 50 percent of the direct one than the effectivity index will fall to 1.5-2.5 but, nevertheless, all plants would have a positive balance
显示更多 [+] 显示较少 [-]Soyabeans in Natal | Agricultural production guidelines for Natal
1990-9999
