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Effect of combined zinc and iron application rates on summer maize yield, photosynthetic capacity and grain quality

Research Paper | May 1, 2018

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Innocent Mugenzi, Dong Yongli, Wansim A. Ngnadong, Hai Dan, Etienne Niyigaba, Angelique Twizerimana, Hai Jiangbo

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Int. J. Agron. Agri. Res.12( 5), 36-46, May 2018


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Zinc (Zn) and iron (Fe) are important nutrients for both human and plants and their soil deficiency is a worldwide concern. This study investigated the benefits of using different rates of sole Zn and Fe along with their combinations on maize crude protein (CP) concentration, ether extract (EE) and crude fiber(CF). And some agronomic traits including dry biomass, grain yield and photosynthesis were examined as well. The field experiment was carried out at Doukou experimental station in 2016 to investigate the effect of Zn, Fe and Zn-Fe combinations on summer maize agronomic traits and quality. The results showed that the application of the micronutrients did not significantly influence maize dry biomass, total leaf area and chlorophyll content (SPAD). However, the application of Zn-Fe soil spray application had a significant effect on maize grain yield from 3497.01 to 4530.26 kg ha-1 and net photosynthetic rate (Pn) from 19.74 to 37.84 CO2 μm-2 g-1 being the increases of 30% and 92% respectively. CP content significantly increased from 8.39% to 9.91 % and CF from 10.81% to 15.96%. These results imply that the use of Zn-Fe combination might be an alternative way to improve maize growth and quality in regions with Zn and Fe deficiency.


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Effect of combined zinc and iron application rates on summer maize yield, photosynthetic capacity and grain quality

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