Pasėlio tankumo įtaka vasarinių rapsų agrocenozei skirtingomis mitybos sąlygomis

Abstract

Field experiment was conducted in 2010 at Experimental Station of the Aleksandras Stulginkis university on a Calc(ar)i-Endohypogleyic Luvisol. The objective of the current study was to determine the influence of crop density_on spring oilseed rape {Brassica napus L.J agrocenosis under different supply of nutrients. Treatments of the investigations: factor A - fertilization: 1) without fertilization, 2) fertilization before rape sowing 64 kg ha"1 N, 64 kg ha"1 P2O5, 94 kg ha"1 K20 and at the budding stage 70 kg ha"1 N. Factor B - crop density: 1) 2 kg ha"1 (50.1-100 plants m"2), 2) 4 kg ha"1 (100.1- 150 plants m"2), 3) 6 kg ha"1 (150.1-200 plants m"2), 4) 8 kg ha"1 (200.1-250 plants m"2), 5) 10 kg ha"1 (250.1-300 plants m"2), 6) 12 kg ha"1 (300.1-350 plants m"2), 7) 14 kg ha1 (350.1-400 plants m"2), 8) 16 kg ha"1 (400.1-450 plants m"2). In spring rape without fertilization a direct, very strong and statistically significant relationship (r = 0.97, P<0.01) was determined between rape crop density and above-ground plant mass