Direct and Joint Effects of Genotype, Defoliation and Crop Density on the Yield of Three Inbred Maize Lines

Dejan Ranković, Goran Todorović, Marijenka Tabaković, Slaven Prodanović, Jan Boćanski and Nenad Delić
Additional contact information
Dejan Ranković: Maize Research Institute, Zemun Polje, 11185 Belgrade-Zemun, Serbia
Goran Todorović: Maize Research Institute, Zemun Polje, 11185 Belgrade-Zemun, Serbia
Marijenka Tabaković: Maize Research Institute, Zemun Polje, 11185 Belgrade-Zemun, Serbia
Slaven Prodanović: Faculty of Agriculture, University of Belgrade, 11080 Belgrade-Zemun, Serbia
Jan Boćanski: Faculty of Agriculture, University of Novi Sad, 21000 Novi Sad, Serbia
Nenad Delić: Maize Research Institute, Zemun Polje, 11185 Belgrade-Zemun, Serbia

Agriculture, 2021, vol. 11, issue 6, 1-14

Abstract: The aim of this study was to observe direct and joint effects of three factors (genotypes, ecological environmental conditions and the applied crop density) on the level of defoliation intensity and yield. Three inbred lines (G) of maize (G1–L217RfC, G2–L335/99 and G3–L76B004) were used in the study. The trials were performed in two years (Y) (Y1 = 2016 and Y2 = 2017) and in two locations (L) (L1 and L2) under four ecological conditions of the year–location interaction (E1–E4) and in two densities (D1 and D2) (50,000 and 65,000 plants ha −1 ). Prior to tasselling, the following five treatments of detasseling and defoliation (T) were applied: T1—control, no leaf removal only detasseling, T2–T5—removal of tassels and top leaves (from one to four top leaves). The defoliation treatments had the most pronounced effect on the yield reduction in G1 (T1–Tn+1… T5), p < 0.05. The ecological conditions on yield variability were expressed under poor weather conditions (E3 and E4), while lower densities were less favorable for the application of defoliation treatments. The result of joint effects of factors was the lowest grain yield (896 kg/ha) in G3 in the variant E3D1 for T2 and the highest grain yield (11,389 kg/ha) in G3 in the variant E2D2 for T1. The smallest effect of the defoliation treatment was on the kernel row number (KRN).

Keywords: maize; detasseling; remove top leafs; location; year; properties (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
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