Energy effectiveness of crop rotations depending on fertilization and area relief
2000
Orlik, T. | Klima, K. (Akademia Rolnicza, Lublin (Poland). Katedra Mikrobiologii Rolniczej)
A two-factor experiment was conducted from 1986-90 at Elizowka near Lublin, (Poland). Two locations were the first factor: (a) on a south facing 15 slope (brown soil developed from loess, powerfully eroded), and (b) valley (Fluvisol). The second factor was diversified nitrogen fertilization - winter rape and winter wheat: 0 kg/ha and 140 kg/ha, and phosphorus-and-potassium treatment under lucerne 0 kg/ha K2O/ha + 120 kg/ha P2O3. Additionally, 30 t/ha was used yearly under the rape as well as 80 kg/ha K2O + 60 P2O5 and 100 kg/ha K2O+70 P2O5 under the winter wheat. The energy value of the main yield was determined using the method recommended by FAO. It assumed that 1 kg of wheat grain dry mass has the energy value 18 MJ, winter rape seeds 27.72 MJ and lucerne green mass 18 MJ. The greatest energy effectiveness was determined for lucerne cultivated in the second year both on the slope and in the catchment valley. Mean value of effectiveness index obtained for lucerne in the first year was 35 lower on the slope and 25 in the valley as compared to lucerne in the second year of utilization. Energy effectiveness index for winter wheat and winter rape exceeded the threshold value, four, when the plants were cultivated in the catchment valley, without nitrogen treatment and with a nitrogen dose of 80 N/ha under winter rape. The value of the energy effectiveness index was inversely proportional to the treatment dose
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