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Critical time for weed removal in corn as influenced by planting pattern and pre herbicides

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2021
Authors
Nedeljković, Dejan
Knežević, Stevan
Božić, Dragana
Vrbničanin, Sava
Article (Published version)
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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 / Crop density / CTWC / Grain yield / Planting pattern / PRE herbicides
Source:
Agriculture (Switzerland), 2021, 11, 7, 587-
Publisher:
  • MDPI AG
Funding / projects:
  • Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200116 (University of Belgrade, Faculty of Agriculture) (RS-200116)

DOI: https://doi.org/10.3390/agriculture11070587

ISSN: 2077-0472

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URI
http://aspace.agrif.bg.ac.rs/handle/123456789/5887
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Poljoprivredni fakultet

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