Role of Post-Harvest Residue Treatment on the Spring Crops Productivity in Haplic Chernozems Iliya ILIEV
Agriculturae Conspectus Scientifi cus
Th e investigation was carried out at Dobrudzha Agricultural Institute during 2014-2016. Th e type of the previous crop post-harvest residue treatment (PHR-wheat) on the yields from sprig crops (common bean, maize, sunfl ower) was investigated in six-fi eld crop rotation. Th e PHR were utilized in three diff erent ways (removed from the fi eld; chopped and subsequently incorporated into the soil; and burned). Th e productivity of the spring crops was signifi cantly aff ected by the
... l conditions and by the ways of utilizing the PHR. Th e complex action of the main meteorological elements was determining for the productivity of common bean and maize. Th ese crops reached maximum productivity in 2014-2550 kg/ha and 9417 kg/ ha respectively. Th e sunfl ower demonstrated high productivity in all three years of the investigation (over 3000 kg/ha), with a maximum in 2016-3517 kg/ha. Th e removal of the post harvest residues from the fi eld decreased the productivity of common bean and maize in comparison to their plowing or burning. Th e burning of the PHR had negative eff ect on the productivity of sunfl ower in all three years of the investigation. In 2016, the greatest diff erentiation of yield was observed depending on the way of PHR utilization. Among the three spring crops, the positive eff ect of the plowing of the PHR was most expressed in sunfl ower. Th e interaction between the meteorological factor and the way of post harvest residue utilization was decisive for its productivity. Averaged for the investigated period, the ways of PHR utilization did not signifi cantly infl uence the productivity of maize.