Harvest index of corn hybrids, depending on plant density, fertilizing doses and weather conditions of growing





corn, hybrid, fertilizing doses, standing density of plants, grain and by-product yield, plants structure, harvest index


Purpose. To determine optimal combination of ferti­lizing doses, plant density for eight studied hybrids with forming economically valuable part of yield by harvest index calculating.

Methods. During 2015–2017, multifactor field experiment was laid and carried out on typical chernozems (Zikrachi village, Kagarlyk district, Kyiv region, Right Bank Forest-Steppe): factor A – hybrid ‘Dniprovskyi 257 CB’, ‘Sigma’, ‘Ragt Alexandra’, ‘Garant’, ‘Kubus’, ‘Moskito’, ‘Sensor’, ‘KВС 381’; factor B – seeding rate 60 and 90 thousands of viable seeds per hectare; factor C – fertilizing doses: N60P45K45; N90P60K60; N120P105K105; N150P135K135. Corn was sown in the period from April 30 till May 4. Accounting of yield was carried out by plots with using a combine. Pre-selected control samples of plants – 10 pieces from two non-adjacent lines in different places of registration area, from two repetitions. Selected plants were analyzed by their structure, determined the mass of by-products and grain. Harvest index was calculated for each option by results of data.

Results. A significant variation in the harvest index (HI) depending on weather conditions of the year has been revealed. 2015 was unfavorable for provision of moisture and high temperatures, which led to violation of flowering, fertilization and grain formation. Generative organs were not formed on some plants or significant partial grain forming was observed. That’s why, in terms of low yields and a disproportionately high biomass, HI in 2015 was the lowest compared with other years – 0.36–0.43. In the favorable year 2016, high yield of grain and biomass was formed – HI and its variation was highest compared to other years for all combinations of variants and hybrids – 0.40–0.52. 2017 was also generally characterized as unfavorable in terms of moisture conditions – yield of grain and vegetative mass were rather low, but proportional – harvest index was 0.39–0.44.

Conclusions. Harvest index varies significantly in growing of corn hybrids with different standing density, varying doses of fertilizers and weather conditions – 0.36–0.52. Under favourable weather conditions, the index has a significant range of variation. Total mass of plants and yield of grain, even for a certain hybrid, varies significantly depending on fertilizing doses and seeding rate in wet years, and in dry years variation is insignificant. Hybrids ‘Sensor’, ‘Mosquito’, ‘КВС 381’ has a fairly high and stable index over the years. Harvest index is lower for all hybrids and doses of mineral fertilizers with standing density 90 thousands plants/ha compared to 60 thousands plants/ha, excluding hybrids ‘Sensor’, ‘Mosquito’. Harvest index for introduction of high doses of fertilizers, was lower in all years and for all hybrids, with some exceptions.


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Kalenska, S., Kalenski, V., Kachura, I., Gonchar, L., & Matvienko, A. (2012). Role of fertilizers and growth regulators in the improvement of winter wheat resistance to stress and yield. In Nährstoff- und Wasserversorgung der Pflanzenbestande unter den Bedingungen der Klimaerwarmung: Internationale wissenschaftliche Konferenz (pp. 65–71). Oktober 18–19, 2012, Bernburg-Strenzfeld.

Wnuk, A., Górny, A. G., Bocianowski, J., & Kozak, M. (2013). Visualizing harvest index in crops. Commun. Biom. Crop Sci., 8(2), 48–59.

Shafi, M., Bakht, J., Ali, S., Khan, H., Khan, M. A., & Sharif, M. (2012). Effect of planting density on phenology, growth and yield of maize (Zea mays L.). Pak. J. Bot., 44(2), 691–696.

Kemanian, A. R., Stöckle, C. O., Huggins, D. R., & Viega, L. M. (2007). A simple method to estimate harvest index in grain crops. Field Crop. Res., 103(3), 208–216. doi: 10.1016/j.fcr.2007.06.007

Sharifi, R. S., Sedghi, M., & Gholipouri, A. (2009). Effect of population density on yield and yield attributes of maize hybrids. Res. J. Biol. Sci., 4(4), 375–379.

Shpaar, D. (Ed.). (2010). Posevnoy i posadochnyy material sel’sko­khozyaystvennykh kul’tur [Seeding and planting material of agriculture crops]. (Book 1). Moscow: DLV AGRODELO. [in Russian]

Unkovich, M., Baldock, J., & Forbes, M. (2010). Variability in harvest index of grain crops and potential significance for carbon accounting: examples from Australian agriculture. Adv. Agron., 105, 173–219. doi: 10.1016/S0065-2113(10)05005-4

Ahmad, R., Hassan, B., & Jabran, K. (2007). Improving crop harvest index. Retrieved from https://www.dawn.com/news/268990

Huehn, M. (1993). Harvest index versus grain/straw-ratio. Theoretical comments and experimental results on the comparison of variation. Euphytica, 68(1–2), 27–32. doi: 10.1007/BF00024151

Kawano, K. (1990). Harvest index and evaluation of major food crop cultivars in the tropics. Euphytica, 46(3), 195–202. doi: 10.1007/BF00027218

Shpaar, D. (Ed.). (2009). Kukurudza. Vyroshchuvannia, zbyrannia, konservuvannia i vykorystannia [Maize. Growing, harvesting, preserving and using]. (4th ed., rev.). Kyiv: Alfa-Steviia LTD. [in Ukrainian]

Ion, V., Dicu, G., Dumbravă, M., Temocico, G., Alecu, I. N., Băşa, A. G., & State, D. (2015). Harvest index at maize in different growing conditions. Rom. Biotech. Lett., 20(6), 10951–10960.

Chakwizira, E., Teixeira, E. I., de Ruiter, J. M., Maley, S., & George, M. J. (2016). Harvest index for biomass and nitrogen in maize crops limited by nitrogen and water. In Proceedings of the 7th Int. Nitrogen Initiative Conf. «Solutions to improve nitrogen use efficiency for the world». Dec. 4–8, 2016, Melbourne, Australia. Retrieved from http://www.ini2016.com/pdf-papers/INI2016_Chakwizira_Emmanual.pdf

Prince, S., Haskett, J., Steininger, M., Strand, H., & Wright, R. (2001). Net primary production of the U.S. Midwest croplands from agricultural harvest yield data. Ecol. Appl., 11(40), 1194–1205. doi: 10.2307/3061021

Pennington, D. (2013). Harvest index: A predictor of corn stover yield. Retrieved from http://www.canr.msu.edu/news/harvest_index_a_predictor_of_corn_stover_yield

Birch, C. J., McLean, G., & Sawers, A. (2008). Analysis of high yielding maize production – a study based on a commercial crop. Aust. J. Exp. Agr., 48(3), 296–303. doi: 10.1071/EA06103

Fischer, K. S., & Palmer, A. (1983). Maize. In W. H. Smith, & S. J. Banta (Eds.), Potential productivity of field crops under different environments (pp. 155–180). Los Baños, Philippines: International Rice Research Institute.

Khalili, M., Naghavi, M. R., Aboughadareh, A. P., & Rad, H. N. (2013). Effects of drought stress on yield and yield components in maize cultivars (Zea mays L.). Int. J. Agron. Plant Prod., 4(4), 809–812.

Hütsch, B. W., & Schubert, S. (2017). Harvest Index of Maize (Zea mays L.): Are There Possibilities for Improvement? Adv. Agron., 146, 37–82. doi: 10.1016/bs.agron.2017.07.004

Ermantraut, E. R., Hoptsii, T. I., Kalenska, S. M., Kryvoruchenko, R. V., Turchynova, N. P., & Prysiazhniuk, O. I. (2014). Metodyka selektsiinoho eksperymentu (u roslynnytstvi) [Method of selection experiment (in crop production)]. Kharkiv: N.p. [in Ukrainian]



How to Cite

Каленська, С. М., & Таран, В. Г. (2018). Harvest index of corn hybrids, depending on plant density, fertilizing doses and weather conditions of growing. Plant Varieties Studying and Protection, 14(4), 415–421. https://doi.org/10.21498/2518-1017.14.4.2018.151909




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