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<div class="title"><h3>11.1 - How to produce hybrid maize seeds</h3><br><h3 class="ch-owner">Anthony Guido, University of Guelph, Canada</h3></div>
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<p>Suggested citation for this chapter.</p>
<p>Guido,A. (2022) How to produce hybrid maize seeds. In Farmpedia, The Encyclopedia for Small Scale Farmers. Editor, M.N. Raizada, University of Guelph, Canada. http://www.farmpedia.org</p>
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      <h1 class="title-bg">Introduction to hybrid maize seed</h1>
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          <p>Smallholder farmers in sub-Saharan Africa face persistent challenges when it comes to maize production, such as low yields, vulnerability to pests and diseases, and limited access to high-quality agricultural inputs (Gaffney et al., 2016; Smale & Mason, 2013). Africa accounts for 15% of the world’s total land used for maize cultivation but even with this number, Africa contributes less than 5% of global maize production due to lower yields compared to many other continents, averaging just 2,000 kg/ ha which is comparable with global averages from over 50 years ago (Grassini et al., 2013). Yield gaps contribute to major food insecurity and constraints on rural livelihoods. One promising solution is the use of hybrid maize seeds. Hybrid maize achieve higher productivity, improved disease resistance, and enhanced tolerance to drought and other environmental stresses (CIMMYT, 2023).</P>
 
<P>In terms of higher yields, hybrid seeds typically yield 20–30% more than traditional open-pollinated varieties (OPVs); this can be attributed to a phenomenon called hybrid vigor, where the traits of two different parents (heterosis), when combined, make an offspring with increased traits than either parent (Dembele & Taressa, 2023). This vigor leads to traits such as stronger root systems, increased biomass, greater resilience to pests and disease, and of course increased yields (Shi et al., 2020; Hamadziripi et al., 2024). The economic benefits can be substantial: in Zambia, the adoption of hybrid maize varieties resulted in a 29% increase in income for smallholder farmers (Smale & Mason, 2013). Moreover, hybrids contribute to food security by ensuring more consistent harvests even under variable climate conditions. </p>
<p>The problem is that hybrid maize seeds must typically be purchased each planting season, as the hybrid effect declines in subsequent generations, which is problematic for small scale farmers that re-use seeds. The main challenges to farmer-led hybrid seed production are not land or inputs, but rather access to appropriate parental seeds, training, and the basic tools needed for controlled pollination (Gaffney et al., 2016).</p>
<p>This chapter explores how smallholder farmers can breed their own hybrid maize seeds, detailing the necessary step-by-step processes for hybridization, as well as the economic implications, challenges associated with the process, and critical evaluation of hybrid maize seed production, weighing the challenges against potential benefits. By understanding these factors, smallholder farmers can make informed decisions on whether hybrid maize breeding is a viable and sustainable approach to improving agricultural productivity and resilience.</p>
<p>[[Image:Inbreed.jpg|thumb|centre|Figure 1. Differences between inbred parents and their resulting hybrid after mating (Haroon, 2014)|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
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      <h1 class="title-bg">How to breed hybrid maize</h1>
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    <p>Hybrid maize breeding involves artificial crossing of two genetically distinct parent lines to produce offspring with valuable traits (hybrid vigour). Hybrid maize breeding includes the selection of parent plants, controlled pollination techniques, and strict seed management to maintain genetic purity. While the majority of farmers rely on purchasing hybrid seeds from commercial suppliers, farm-level hybrid maize breeding allows for greater flexibility to adapt to unique local conditions and reduces the reliance of farmers on outside seed firms. (Mangelsdorf, 1951). </P>
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      <h1 class="title-bg">Steps to Breed Your Own Hybrid Maize Seeds </h1>
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          <p><b>1. Select Two Parent Lines</b></p>
<p> Choose two inbred maize varieties with desirable traits, based on local experiments or advice from experts.</p>
<p> One parent should have a specific beneficial trait (e.g., disease resistance).</p>
<p> The other should be a high-performing, well-established variety.</p>
<p><b>2. Prepare for Pollination</b></p>
<p> Plant the two parent lines in a field location away from other maize plants to prevent pollen cross-contamination (isolation to ensure genetic purity)</p>
<p><b>3. Controlled Cross-Pollination (see Figures 2-9 for step by step process)</b></p>
<p> Before silks emerge, cover the female ears with bags to prevent uncontrolled pollination (See Figures 2 and 3). The silks should not be brown (i.e. <7 days after silk emergence from the cobs).</p>
<p> The day before pollination, the silks should be cut to promote new growth, which promotes better acceptance of the pollen and more consistent seed size and number (Figure 4). </p>
<p> Collect pollen from the male plants and manually introduce it to the silks of the female plants. To do this, in the late afternoon or evening on the day before the pollination, gently shake the tassel (Figure 5) to remove old pollen, then place a bag over the tassel and close it at the bottom by folding it and adding a paper clip (Figure 6 and 7). On the day of the pollination, the tassel bag should be gently shaken to collect the pollen in the bag, then the bag should be removed, taken to the female, where the cob bag should be quickly removed, and pollen should be shaken onto the silks (Figure 8), then the tassel bag should be placed onto the cob and closed at the base using a staple or paper clip (to prevent pollen cross-contamination) (Figure 9). The cob will develop within this bag until the seeds are mature.</p>
<p><b>4. Harvest and Store Seeds</b></p>
<p> Allow the hybrid maize ears to mature fully before harvesting. (using dates marked on the bags allow farmers to know when the ear was pollinated.)</p>
<p> Seeds should be inspected and checked for any pests or diseases.</p>
<p> Dry the seeds until hard and store them in a cool, dry place for the next planting season.</p>
Farmers can also collaborate with agricultural breeders to refine their techniques. By mastering hybrid breeding, smallholders can enhance their yields and crop resilience, even in remote areas (Gaffney et al., 2016). </p>
<p>[[Image:Invst.jpg|thumb|centre|Figure 2. Unbagged maize ears (Logsdon, 2021)|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
<p>[[Image:Maize 3.jpg|thumb|centre|Figure 3  bags placed over female ears to prevent unwanted pollination (Abbey, 2025)|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
 
<p>[[Image:Maize 4.jpg|thumb|centre|Figure 4 Trimming the ear silks the day before pollination; a clean knife can also be used (Ogawa, 2014)
 
|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
<p>[[Image:Maize 5.jpg|thumb|centre|Figure 5 Male maize tassels (Ogawa, 2014)|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
<p>[[Image:Maize 6.png|thumb|centre|Figure 6. Placing bags over tassels. Source: https://vidamaz.com/2021/08/24/corn-bagging/#jp-carousel-29709|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
<p>[[Image:Maize 7.jpg|thumb|centre|Figure 7. Tassels shedding morning pollen into bags.  https://vidamaz.com/wp-content/uploads/2021/08/dsc_5050-2.jpg|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
<p>[[Image:Maize 8.jpg|thumb|centre|Figure 8. Collected pollen  being introduced to ear silks from a tassel bag  (Ogawa, 2014)|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
<p>[[Image:Maize 9.jpg|thumb|centre|Figure 10. Diagram highlighting hybrid breeding (Mangelsdorf, 1951)|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
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      <h1 style="background: #FBB03B;padding: 15px;font-weight: 600;color: #000;font-size: 22px;margin:unset;text-align:center;">Commercial scale hybrid maize production</h1>
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          <p>The above method is to generate a few thousand seed for small scale farmers, but for commercial farmers or cooperatives, there is a different larger scale method used. In this method, alternating rows of the two parents are planted in an isolation block, and the female parent is detasseled: they are then allowed to open-pollinate, and only cross-pollinated cobs of the female are harvested, not the cobs of the male parent which might be self-pollinated.</p>
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      <h1 class="title-bg">Challenges to hybrid maize production</h1>
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          <p><b>Despite its advantages, hybrid maize production faces several challenges:</b></p>
<p><p> High Production Costs:</b></p> Depending on whether a farmer produces his seed or not, Hybrid seed production involves research, controlled breeding, and labour-intensive pollination techniques (Debele et al., 2023). Farmers typically must repurchase hybrid seeds each season due to genetic segregation. If a hybrid seed is produced commercially several years are needed to produce a seed to be released.</P>
<p><b> Limited Access to Parental Seeds:</b></p> To sustain hybrid production, farmers must have reliable access to inbred parental lines. One solution is for farmers to self-pollinate each inbred line to maintain a renewable supply of parental seeds.</P>
<p><b> Labour and Training Needs:</b></p> Producing hybrid maize requires knowledge and labour for controlled pollination and seed storage. External assistance, the pictures shown here, or images from the Sustainable Agriculture Kit (SAK) picture book may be helpful (see Resources to Get Started below).</P>
<p><b> Environmental Suitability:</b></p> Some hybrid varieties may be less adaptable to diverse conditions than open-pollinated varieties, which offer greater genetic diversity and resilience.</P>
<p>To mitigate these challenges, investments in sustainable seed systems, improved hybrid resilience, and farmer training programs are essential. Local breeding initiatives and agricultural cooperatives can help make hybrid maize technology more accessible to smallholder farmers.
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<p>[[Image:Maize 11.jpg|thumb|centre|Figure 11.  Diseased maize seeds compared to good ones (Hager, 2016)|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
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      <h1 class="title-bg">Cost analysis </h1>
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          <p>Depending on whether a farmer is producing his/her seed or buying them, the production of hybrid maize seeds requires significant investment in inputs, labour, and management. A benefit of hybrid seeds is that a relatively small amount of land is required for seed production because a single hybrid cob can yield 300-600 seeds, which can produce an equivalent number of plants. In terms of cost, producing hybrid maize ranges from $500 to $600 per hectare, with potential revenues reaching $1,300 to $1,400 per hectare, making hybrid seed production profitable despite higher initial costs (Bahtir et al., 2020).</p>
<p>In Indonesia, hybrid maize seeds cost around 0.77 USD/Kg to 0.21 USD/Kg  (Bahtir et al., 2020).  In Nigeria, hybrid seed prices range from 1.30 USD/Kg to 2.61 USD/Kg. This price reflects the labour required to maintain genetic purity and the intensive breeding process itself required to create the hybrid. Additional cost factors include the need for specialized parent seed lines; the detasseling process, a labor-intensive step in hybrid maize production, also increases costs due to the need for manual labor or mechanized detasseling equipment (Pixley & Bjarnason, 2002).</p>
<p>While the upfront costs of hybrid maize seed production are considerably higher than those of open-pollinated varieties, the return on investment remains favorable due to the higher market price and superior yield potential of hybrid seeds. However, profitability can vary depending on market conditions, and climate variability.</p>
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      <h1 class="title-bg">Critical analysis</h1>
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<p>The introduction of hybrid maize has played a transformative role in global food production, significantly increasing yield potential and enhancing food security. For a good example of of the role of hybrid maize in current agriculture, we can compare maize yields in the United States in the 1930’s compared to today. Since hybrid maize was first commercially grown in the 1930s, when hybrid maize seeds were beginning to be used for production, U.S. maize yields have seen remarkable growth. Over the last 60 years, maize yields have gone from 1,940 kg/ha to 5,960 kg/ha, a production increase over 207%.(FAOSTAT, 2024; United Nations, 2025).</p>
<p>This rapid expansion highlights the role of hybrid maize in meeting global food demands as well as helping to support small scale farmers who may have higher risks of food insecurity. The widespread adoption of hybrid seeds raises concerns regarding genetic diversity, economic accessibility, and sustainability.</p>
<p>To address these challenges, efforts to promote participatory breeding and farmer-led seed systems could help balance the benefits of hybrid breeding practices with the need for local adaptation and knowledge being taught to farmers. Future breeding strategies should prioritize climate-resilient traits, reduce input dependency, and ensure equitable access to improved inbred seed varieties. In Zambia, the adoption of hybrid maize has increased smallholder incomes by an average of 29% (Smale & Mason, 2013), demonstrating its potential to improve livelihoods while contributing to global food security. </p>
<p>[[Image:Maize12.jpg|thumb|centre|Figure 12. Global corn yields (Kg/ha) over the last 60 years (FAOSTAT, 2025)|Click on the image to access a higher resolution image as well as lessons adapted for different geographic regions.]]</p>
<p>Hybrid maize success emphasizes the potential of agricultural innovation to enhance productivity and livelihoods. But in the end, hybrid maize system sustainability in the longer term depends on addressing fundamental issues such as economic access, environmental performance, and loss of genetic diversity. To ensure that hybrid maize gains are inclusive and long-term, strategies in the future need to allow farmer participation, promote climate-resilient and low-input varieties, and promote seed systems enabling local communities. In accordance with complementing technology development with sustainable processes and farmers' choice, hybrid maize can continue to serve as a keystone in meeting food needs of a growing global population.</p>
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      <h1 class="title-bg">Additional Resources to Get Started</h1>
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<p>University of Nebraska–Lincoln (Director). (2015, September 4). How Are Corn Hybrids Created [Video recording]. https://www.youtube.com/watch?v=15flCcT9N3g</p>
<p>ciencexMedia at Global Development (Cornell University) (Director). (2018, August 22). What are Corn Hybrids?  Where did they come from?  With Professor Margaret Smith, Cornell University [Video recording]. https://www.youtube.com/watch?v=ITmC2emSAdw</p>
<p><b>Picture lessons for farmers in SAKBooks.com:</b></p>
<p>South Asian Version – Chapter 12.2 - https://sakbooks.com/south-asia-english-version-all-chapters/</p>
<p>East/Southeast Asia version – Chapter 12.2 - https://sakbooks.com/east-south-east-asia/</p>
<p>Sub-Saharan Africa/Caribbean version – Chapter 12.2 - https://sakbooks.com/sub-saharan-africa-caribbean/</p>
<p>Latin American version – Chapter 12.2 - https://sakbooks.com/latin-america/</p>
<p>Middle East/North Africa version – Chapter 11.2 - https://sakbooks.com/north-africa-middle-east-english-version/ </p>
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      <h1 class="title-bg">References</h1>
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<p>1. Bahtiar, B., Zanuddin, B., & Azrai, M. (2020a). Advantages of Hybrid Corn Seed Production Compared to Corn Grain. International Journal of Agriculture System, 8(1), 44. https://doi.org/10.20956/ijas.v8i1.2327</p>
<p>2. Debele, M. and Taressa, B. (2023) Determination of Seed Production Cost and Net benefit of hybrid Maize at Bako Agricultural Research Center, Western Oromia, Ethiopia. Advanced Journal of Seed Science and Technology 9, 307-312. https://advancedscholarsjournals.org/journal/ajsst/articles/determination-of-seed-production-cost-and-net-benefit-of-hybrid-maize-at-bako-agricultural-research-center,-western-oromia,-ethiopia</p>
<p>3. Gaffney, J., Anderson, J., Franks, C., Collinson, S., MacRobert, J., Woldemariam, W., & Albertsen, M. (2016b). Robust seed systems, emerging technologies, and hybrid crops for Africa. Global Food Security, 9, 36–44. https://doi.org/10.1016/j.gfs.2016.06.001</p>
<p>4. Grassini, P., Eskridge, K. M., & Cassman, K. G. (2013). Distinguishing between yield advances and yield plateaus in historical crop production trends. Nature Communications, 4(1), 2918. https://doi.org/10.1038/ncomms3918</p>
<p>5. Hamadziripi, E. T., Collinson, S., Voss, R. C., Baudron, F., Labuschagne, M. T., Franke, A. C., Zaman‐Allah, M., Olsen, M. S., Burgueño, J., & Cairns, J. E. (2024). Validating a novel genetic technology for hybrid maize seed production under management practices associated with resource‐poor farmers in Zimbabwe. PLANTS, PEOPLE, PLANET, ppp3.10590. https://doi.org/10.1002/ppp3.10590</p>
<p>6. Hand pollinating Dan’s blue-blond sweet corn—Guest blog by PFI member John Whitson—Practical Farmers of Iowa. (n.d.). Retrieved April 4, 2025, from https://practicalfarmers.org/2014/10/hand-pollinating-dans-blue-blond-sweet-corn-guest-blog-by-pfi-member-john-whitson/</p>
<p>7. CIMMYT (2020) How hybrid maize helps farmers get through dry spells (Dec 18, 2020). CIMMYT. https://www.cimmyt.org/news/how-hybrid-maize-helps-farmers-get-through-dry-spells/ </p>
<p>8. Mangelsdorf, P. (1951). Hybrid corn. Scientific American 185(2), 39–47.</p>
<p>9. Plumb, L. (2024, February 27). Hybrid Corn Seed Technologies Drive High Yields Despite Adverse Weather. Champion Seed. https://www.plantchampion.com/agronomy-resources/corn/technology-and-performance/hybrid-corn-seed-technologies-drive-high-yields-despite-adverse-weather/</p>
<p>10. Smale, M., & Mason, N. M. (2013). Hybrid Seed, Income, and Inequality Among Smallholder Maize Farmers in Zambia. IAPRI Working Paper, Lusaka, Zambia.  https://doi.org/10.22004/AG.ECON.146929</p>
<p>11. CIMMYT (2021) Stress-resilient hybrids help maize farmers in tropical rainfed conditions in Africa and Asia. CIMMYT Annual Report 2021. Retrieved April 4, 2025, from https://annualreport2021.cimmyt.org/stress-resilient-hybrids-help-maize-farmers-in-tropical-rainfed-conditions-in-africa-and-asia/</p>
<p>12. Troyer, A. F. (2009). Development of Hybrid Corn and the Seed Corn Industry. In J. L. Bennetzen & S. Hake (Eds.), Handbook of Maize (pp. 87–114). Springer New York. https://doi.org/10.1007/978-0-387-77863-1_5</p>
<p>13. Wright, H. (2015). Commercial Hybrid Seed Production. In W. R. Fehr & H. H. Hadley (Eds.), Hybridization of Crop Plants (pp. 161–176). American Society of Agronomy, Crop Science Society of America. https://doi.org/10.2135/1980.hybridizationofcrops.c8</p>
<p>14. Hager, A. (2016, September 23). Diplodia ear mold at harvest: What can be done now? Farmdoc. https://farmdoc.illinois.edu/field-crop-production/uncategorized/diplodia-ear-mold-at-harvest-what-can-be-done-now.html</p>
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