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Response of maize (Zea mays L.) secondary growth parameters to conservation agriculture and conventional tillage systems in Zimbabwe

Author: Hlatywayo, R.
Author: Mhlanga, B.
Author: Mazarura, U.
Author: Mupangwa, W.
Author: Thierfelder, C.
Year: 2016
URI: http://hdl.handle.net/10883/18553
Abstract: Previous, research focused mainly on the effects of conservation agriculture (CA) and conventional practices (CP) on crop yield mostly. A study was conducted at five sites in Zimbabwe from 2012 to 2014 to investigate effects of CA and CP practices on emergence, chlorophyll content, early vigour and grain yield of different maize varieties using 12 hybrids and 4 open pollinated varieties (OPVs). The experiment was laid as a 4 × 4 alpha lattice design with three replications. Emergence was higher under CA (75%) at University of Zimbabwe (UZ) in 2012/13 and Domboshawa Training Centre (DTC) (67%) compared to CP (71% and 39% respectively). Lower early plant vigour was observed under CA compared to CP at most sites. CA had lower leaf chlorophyll content during the early crop growth stages compared to CP. However, at some instances, CA had higher leaf chlorophyll content (45 units) than CP (35 units) at 78 days after sowing in Zimuto 2012/13. For maize yield, CA outperformed CP on a sandy loamy soil (3050 kg ha-1 vs 2656 kg ha-1) and clay soil (4937 kg ha-1 vs 4274 kg ha-1). However, on a sandy soil, CP outperformed CA (1764 vs 1313 kg ha-1). Our results suggest that tillage effects on early maize plant vigor, leaf chlorophyll content and the final yield can be site and season specific. Furthermore, a delay of nutrient release for plant uptake under CA systems was found and potentially implies investigations of new fertilization strategies for such cropping systems.
Abstract: Previous, research focused mainly on the effects of conservation agriculture (CA) and conventional practices (CP) on crop yield mostly. A study was conducted at five sites in Zimbabwe from 2012 to 2014 to investigate effects of CA and CP practices on emergence, chlorophyll content, early vigour and grain yield of different maize varieties using 12 hybrids and 4 open pollinated varieties (OPVs). The experiment was laid as a 4 × 4 alpha lattice design with three replications. Emergence was higher under CA (75%) at University of Zimbabwe (UZ) in 2012/13 and Domboshawa Training Centre (DTC) (67%) compared to CP (71% and 39% respectively). Lower early plant vigour was observed under CA compared to CP at most sites. CA had lower leaf chlorophyll content during the early crop growth stages compared to CP. However, at some instances, CA had higher leaf chlorophyll content (45 units) than CP (35 units) at 78 days after sowing in Zimuto 2012/13. For maize yield, CA outperformed CP on a sandy loamy soil (3050 kg ha-1 vs 2656 kg ha-1) and clay soil (4937 kg ha-1 vs 4274 kg ha-1). However, on a sandy soil, CP outperformed CA (1764 vs 1313 kg ha-1). Our results suggest that tillage effects on early maize plant vigor, leaf chlorophyll content and the final yield can be site and season specific. Furthermore, a delay of nutrient release for plant uptake under CA systems was found and potentially implies investigations of new fertilization strategies for such cropping systems.
Language: English
Publisher: Canadian Center of Science and Education
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Areas of Knowledge: AGRICULTURAL SCIENCES AND BIOTECHNOLOGY
Type: Article
Country focus: Zimbabwe
Place: Canada
Pages: 112-126
Issue: 11
Journal: Journal of Agricultural Science
Volume: 8
DOI: 10.5539/jas.v8n11p112
Keywords: Early Vigour
Keywords: Grain Yield
Audience: Researchers
Country of Focus: ZIMBABWE
Agrovoc: CHLOROPHYLLS
Agrovoc: CROPPING SYSTEMS
Agrovoc: PRECOCITY
Agrovoc: CROP YIELD
Agrovoc: NITROGEN CONTENT
Access Level: Open Access


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  • Sustainable Intensification
    Sustainable intensification agriculture including topics on cropping systems, agronomy, soil, mechanization, precision agriculture, etc.

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