engleski

Investigation of rational soil tillage for maize (Zea mays. L) in eastern Croatia

Investigations in 1997-1999 with maize and winter wheat and spring barley in crop rotation on lessive-pseudogley, in semiarid to semihumid climate were carried out with five variants: 1.Conventional tillage: stubble field diskharrowing ; ploughing (30-35 cm) ; in spring diskharrowing and vibrocultivation ; inter-row cultivation with fertilisation ; 2A.Conventional tillage following diskharrowing in previous year ; 2B.Diskharrowing following conventional tillage in previous year ; 3.Diskharowing, every year, the other as at variant 1 ; 4.Diskharrowing and loosening of plow-layer (30-35 cm), the others as a variant 1. Fertilisation comprised 200 kg N, 100 kg P2O5 and 150 kg K2O5 ha-1. Hybrid OSSK 382 (FAO 410) was planted. The basic plot was 780 m2 and the experiment was carried out in randomised plots in four replications. Climatically, 1997 was very favourable, 1998 as average and 1999 extremely wet. Grain yields were: in 1997, 1=10.56 ; 2A=10.55 ; 2B=8.16 ; 3=8.38 ; 4=8.98 t ha-1. Differences comparing to variant 1, except at 2A, were highly significant. In 1988, 1=8.48 ; 2A=8.85 ; 2B=8.17 ; 3=7.47 ; 4=7.66 t ha-1. Differences comparing to variant 1 were significant only for variant 3. In 1999, 1=6.77 ; 2A=6.33 ; 2B=5.96 ; 3=4.47 ; 4=5.18 t ha- 1. All differences comparing to standard, except for 2A, were highly significant, equally in 1997-1999 average: 1=8.60 ; 2A=8.58 ; 2B=7.43 ; 3=6.77 ; 4=7.27 t ha-1. Conclusion is that besides of standard tillage, the other treatments reserve more attention, too. Namely, energetically, economically and organisationally some investigated tillage treatments offer much more favourable advantages then the yield alone, although the continuos diskharrowing showed itself as questionable practise.

maize ; soil tillage

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