Weed control and grain yield in double-cropped soybean

Abstract

The effects of different herbicide combinations: control (1), alachlor+linuron (2), and alachlor+linuron+imazethapyr (3) were investigated in double-cropped soybean grown in two row spacing variants, 38 cm and 76 cm, under conventional tillage (CT) or no-tillage (NT). In trials conducted on a sandy loam soil at Zemun Polje, high weediness had a negative effect of on the yield of double-cropped soybean, especially at the higher row spacing tested and with no-tillage. Regression and correlation data revealed a dependence of weediness in double-cropped soybean on tillage system and herbicide combination, and dependence of soybean yield on tillage system.

U radu su prikazani rezultati uticaja primene različitih kombinacija herbicida: kontrola (1); alahlor+linuron (2); alahlor+linuron+imazetapir (3); u postrnom usevu soje gajenom na dva međuredna rastojanja: 38 cm; 76 cm; u konvencionalnom sistemu obrade (CT) i u direktnoj setvi (NT). Na zemljištu tipa slabokarbonatni černozerm u Zemun Polju konstatovan je negativan uticaj povećane zakorovljenosti na prinos soje u postrnoj setvi, posebno gajenjem na većem međurednom rastojanju i direktnom setvom u neobrađeno strnište. Utvrđene su jasne regresione i korelacione zavisnosti zakorovljenosti postrnog useva soje od sistema obrade zemljišta, zakorovljenosti i kombinacije primenjenih herbicida, kao i prinosa soje od sistema obrade zemljišta.