Critical Time for Weed Removal in Corn as Influenced by Planting Pattern and PRE Herbicides

Dejan Nedeljković, Stevan Knežević, Dragana Božić and Sava Vrbničanin
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Dejan Nedeljković: Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade, Serbia
Stevan Knežević: Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE 68583-0915, USA
Dragana Božić: Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade, Serbia
Sava Vrbničanin: Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade, Serbia

Agriculture, 2021, vol. 11, issue 7, 1-13

Abstract: Determining the critical time for weed removal (CTWR) is essential for the development of an integrated weed management plan. Therefore, field experiments were conducted to evaluate the effects of two planting patterns (standard and twin-row) with and without PRE-applied herbicides on CTWR in corn. Experiments were laid out in a split-plot arrangement with two main plots: (i) standard row planting (SRP) that is 70 cm wide, and (ii) twin-row planting (TRP) with 50 cm distance between each set of double rows. Each main plot was divided into two sub-plots (with and without PRE herbicides). The sub-sub-plots consisted of seven weed removal timings for PRE herbicides, and tank mixes were utilized (S-metolachlor (1.44 kg a.i. ha −1 ) + terbutylazine (0.75 kg a.i. ha −1 )). The CTWR without PRE herbicides was similar in both the SRP and TRP systems, where it was around the V1 to V2 (16 to 19 d after emergence (DAE)) growth stages. The use of PRE-applied herbicides delayed CTWR in SRP to the V4 to V10 (25 to 58 DAE) stages and up to the V11 (60 DAE) stage in TRP. These results clearly indicate that PRE herbicides are important for protecting corn yields regardless of the planting pattern. In more meteorologically favorable seasons (sufficient heat and precipitation) in both sowing systems, corn plants produce their biological maximum with the fact that over the number of plants per unit area (SRP = 80,000 plants ha −1 , TRP = 93,900 plants ha −1 ) provide higher yields in variants with PRE herbicides, and thus the advantage of the TRP system can be justified.

Keywords: corn; CTWC; planting pattern; crop density; grain yield; PRE herbicides (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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