Naslov
Effect of reduced soil tillage on soybean (Glicine max L Merr.) production in the Horro Alleltu Area, Ethiopia

Autori
Jurić, Ivo ; Žugec, Ivan ; Josipović, Marko ; Petrač, Božidar ; Crnjac, Miljenko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Plant nutrition for the next millennium nutrients, yield, quality and the environment / H. E. Prof. Dr. Mofeed Shehab - Kairo : The international Society for horticultural Science, 2000, 291-292

Skup
X-th international Colloquium for Optimization of plant Nutrition

Mjesto i datum
Kairo, Egipat, 08.06.2000. - 13.06.2000

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
tillage ; soil ; reduced tillage

Sažetak
Four year stationary investigations (1987-1990) with reduced soil tillage for soybean on feralithic (feralsol) rhodic soil type with very good composition favourable internal and external drainage in the subtropical area of Horro Alleltu, Nekemte, Wollega Province, Ethiopia were caried out with the following treatments: A-basic soil tillage (main-factor): A1-ploughing (20 cm) disk harrowing (in further text conventional or standard tillage), A2- subsoiling (30-35 cm), disk harrowing, A3-deep disk harrowing (10-15 cm), A4-shallow disk harrowing (5-10 cm), A5-planting without basic soil tillage (no-till planter) ; B- fertilization levels (sub-factor): B1-no fertilization, B2-40 kg ha-1 N+50 kg ha-1 P2O5, B3-80 kg ha-1 N+100 kg ha-1 P2O5, B4-120 kg ha- 1 N+150 kg ha-1 P2O5 (Urea and DAP were used) ; C-soil tillage during the vegetation period (sub-sub-factor): C1- hoeing (two times), C2- hoeing (once), C3- without cultivation. The field experiments were performed accordingly to split-split plot method with randomised plots in bloks in four replications. The four year average yields (1987-1990) in t ha-1 were (the main factor efects):A1=2.26 ; A2=2.29 ; A3=2.42 ; A4=2.42 ; A5=2.20 ; B1=2.16 ; B2=2.30 ; B32.31 ; B4=.2.47 ; C1=2.31 ; C2=2.34 ; C3=2.31. The yields accordingly to interactions AB were: A1B1=2.00 ; A1B2=2.32 ; A1B3=2.30 ; A1B4=2.46 ; A2B1=2.05 ; A2B2=2.25 ; A2B3=2.36 ; A2B4=2.48 ; A3B1=2.28 ; A3B2=2.43 ; A3B3=2.46 ; A3B4=2.53 ; A4B1=2.22 ; A4B2=2.37 ; A4B3=2.54 ; A4B4=2.57 ; A5B1=2.22 ; A5B2=2.14 ; A5B3=2.13 ; A5B4=2.31. Interactions AC were: A1C1=2.26 ; A1C2=2.30 ; A1C3=2.24 ; A2C1=2.37 ; A2C2=2.27 ; A2C3=2.24 ; A3C1=2.40 ; A3C2=2.43 ; A3C3=2.45 ; A4C1=2.41 ; A4C2=2.43 ; A4C3=2.44 ; A5C1=2.21 ; A5C2=2.24 ; A5C3=2.14. Interactions BC were: B1C1=2.15 ; B2C1=2.29 ; B3C1=2.34 ; B4C1=2.44 ; B1C2=2.18 ; B2C2=2.29 ; B3C2=2.39 ; B4C2=2.47 ; B1C3=2.13 ; B2C3=2.31 ; B3C3=2.36 ; B4C3=2.50. Planting without basic soil tillage, although in some years with significantly lower yields, comparing to ploughing, deserves a special attention because of the economical and antierosive effect, what is of a special importance for the investigated area. Fertilization with the increased rates of nitrogen and phosphorus showed different efficiency in the comparision to the non- fertilized plots and within themselves. The best results were obtained with higher levels of the applied fertilizers. However, 40-80 kg N+50-100 kg P2O5 ha-1 could be regarded as an acceptable fertilization. Cultivation during the vegetation period did not have any significant effect to the yield increase, meaning that in such conditions a soybean production could be possible without soil tillage during the vegetation. The application of an alternative tillage, especially planting without basic tillage at all (zero tillage) in the sense of erosion control, conservation tillage and soil compaction preventing is a fully justified, more efficient and cheaper solution in the production of soybean, which requires a detalied practical development. _______________________________________________ ___

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA