SOIL TILLAGE IMPACTS ON NUTRITIONAL STATUS OF SOYBEAN Faculty of Agriculture, University J.J. Strossmayer in Osijek, Trg Sv. Trojstva 3, HR Osijek, Croatia, Irena JUG, Danijel JUG, Vlado KOVAČEVIĆ, Bojan STIPEŠEVIĆ, Ivan ŽUGEC
Introduction Object of this study was testing nutritional status of soybean under different soil tillage with aim of possible new recommendation for fertilization under reduction/absence of soil tillage.
Material and methods The Field experiment cultivar :: soybean TISA (in rotation with winter wheat) maturity group 0-1 location :: eastern Croatia – experimental site near Kneževo experimental period :: soil tillage treatments :: CT – conventional tillage DH – diskharrowing NT – no-tillage Basic experimental plot :: 900 m -2 fertilization :: N:P 2 O 5 :K 2 O=40:130:130 kg ha -1 +Bradyrhizobium japonicum - trade name “Biofiksin S”
Conventional tillage - in autumn
Diskharrowing - in autumn
No-tillage – early season
Sampling and chemical analysis sampling soybean :: R-4 (full-developed pods) samples :: microwave digestion (65% HNO % H 2 O 2 ) analyses :: 23 elements with a Jobin-Yvon Ultrace 238 ICP-OES spectrometer (laboratory of the RISSAC, Budapest, Hungary) sowing :: John Deere 750A interrow spacing 16.5 cm 550 plants per square meter deep of sowing 3-5 cm Plant protection :: uniformly for each tillage treatments
Soil characteristics calcareous chernozem on loess substrate chemical properties :: pH (H 2 O) - 8,1 pH (KCl) - 7,5 Humus - 2,6% CaCO 3 - 2,1% P 2 O 5 -18,7 mg 100 g -1 tla (AL-soluble) K 2 O - 28,4 mg 100 g -1 tla (AL-soluble)
Mean air temperature and precipitation on experimental field (N::45 82, E::18 64) YearPrecipitation (mm)Air temperature ( o C) Weather characteristic
Results
Soil tillage (ST) :: conventional - CT; diskharrowing - DH; no-till - NT and composition of soybean (cultivar Tisa)** ST The aerial part of soybean at full-developed pods stage** Percent on dry matter basismg kg -1 on dry matter basis PKCaMgSZnMnMoCuB CT DH NT LSD 5%n.s. 1.3n.s. Mean Influences of the soil tillage on nutritional status of soybean in four year average Referral values of some nutrients in soybean (Bergman, 1992)
Soil tillage (ST) :: conventional - CT; diskharrowing - DH; no-till - NT and composition of soybean (cultivar Tisa)** ST The aerial part of soybean at full-developed pods stage** mg kg -1 on dry matter basis FeCoNiCrSrBaAlPbCdNa CT DH NT LSD 5%n.s n.s. Mean under detectable levels (mg kg -1 ): Se (<0.60), Hg (<0.12), As (<0.40)
The year (the factor A) and soil tillage (ST = the factor B: conventional = CT; diskharrowing = DH; no-till = NT) and composition of soybean (cultivar Tisa) YearSTThe aerial part of soybean at full-developed pods stage (A)*(B)Percent on dry matter basismg kg -1 on dry matter basis PKCaMgSZnMnFeCuB 2003CT DH NT LSD AxB 5% LSD AxB 1% n.s n.s n.s n.s. mg kg -1 on dry matter basis MoCoNiCrSrBaAlPbCdNa 2003CT DH NT LSD AxB 5%n.s.0.089n.s. 188n.s. * non-significant (n.s.) differences among treatments for 2002, 2004 and 2005 Impact of interaction AxB (year and soil tillage) on nutritional status of soybean
Conclusion reduction or absence of soil tillage under conditions of calcareous chernozem of Barannya province did not seriously affect nutritional status of soybean usual fertilization practice can be recommended for possible use of non-conventional soil tillage practice
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