Evaluating the effect of plant population densities and nitrogen application on the leaf area index of maize in a reclaimed wetland in Kenya

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Maize is the main staple food in Kenya with over 90% of Kenyans relying on it. While the annual national consumption is increasing, the production of this crop has been on the decline in the last two decades. Maize production in Kenya fell by 33.4% in 2013 with Nyeri among the counties said to be grappling with the production of this crop. Land pressure is one of the major causes of decreased availability of food as well as soil depletion and encroachment upon fragile ecosystems such as wetlands. Nitrogen is a key nutrient in the production of maize, and its deficiency is a major factor limiting its production. This study investigated the effect of N application at 120 kg N/ha and maize density on the Leaf Area Index in reclaimed wetland soils in an experimental set-up comprising a randomized complete block design with three replications. The research was carried out in Nyeri County, Kenya. Leaf Area Index (LAI) was determined using the given SunScan formula. Measurements were done continuously until crop physiological maturity. Results indicated that the leaf area index increased with nitrogen application and reduced with spacing for most treatments. There were no significant differences between the two methods (Copy Method and SunScan). Leaf Area Index (LAI) was high in treatments containing nitrogen and high plant density. It was concluded that high plant density gives high LAI. 50 cm * 12.5 cm (-N) and 50 cm * 12.5 cm (+N) are the recommended plant densities for the site.

[1] Asner, G. P., Keller, M., Pereira, R., Zweede, J. (2002), Remote sensing of selective logging in Amazonia: assessing limitations based on detailed field measurements, Landsat ETM+ and textural analysis. Remote Sensing of Environment 80, 483-496.

[2] Bondavalli, B., Colyer, D., Kroth, E. M. (1970), Effects of weather, nitrogen and population on corn yield response. Agron. J. 62, 669-672.

[3] Chandra, D., Gautan, R. C. (1997), Performance of maize varieties at varying plant densities. Ann. Agric. Res. 18, 375-376.

[4] Kamiri M., Alvarez, M., Becker, M., Böhme, B., Handa, C., Josko, H. W., Langensiepen, M., Menz, G., Misana, S., Mogha, N. G., Möseler, B. M., Mwita, E. J., Oyieke, H. A., Sakané, N. (2012), Floristic classification of the vegetation in small wetlands of Kenya and Tanzania: characterization based on soil and water resources. Global Journal of Science Frontier Research: H: Environment & Earth Science 14(1).

[5] Modarres, A. M., Hamilton, R. I., Dijak, M., Dwyer, L. M., Stewart, D. W., Mather, D. E., Smith, D. L. (1998), Plant density effects on maize inbred lines grown in short season environments. Crop Science 38, 104-108.

[6] Pandey, R. K., Maranville, J. W., Chetima, M. M. (2000), Deficit irrigation and nitrogen effects on maize in a Sahelian environment. ΙΙ. Shoot growth. Agric. Water Manage. 46, 15-27.

[7] Valentinuz, O. R., Tollenaar, M. (2006), Effect of genotype, nitrogen, plant density and row spacing on the area-per-leaf profile in maize. Agron. J. 98, 94-99.

[8] Okalebo, J. R., Gathua. K. W., Woomer, P. L. (2002), Laboratory methods of soil and plant analysis: A working manual - 2nd edition. Tropical Soil Biology and Fertility - CIAT and Sacred Africa, Nairobi, Kenya.

[9] Gaurkar, S. G., Bharad, G. M. (1998), Effect of plant population, detopping and nitrogen levels on growth and yield of maize. PKV Res. J. 22, 136-137.

[10] Oguntunde, P. G., Olukunle, O. J., Fasinmirin, J. T., Abiolu, A. O. (2012), Performance of the SunScan canopy analysis system in estimating leaf area index of maize. Agric. Eng. Int.: CIGR Journal 14(3), 1-7.

[11] Tekalgin, T., Haque, I., Aduayi, E. A. (1991), Plant, water, fertilizer, animal manure and compost analysis manual. Plant Science Division Marking Document 13 ILCA, Addis Ababa.

[12] Cardwell, V. B. (1992), Fifty years of Minnesota corn production: sources of yield increase. Agron. J. 74, 984-995.

Acta Universitatis Sapientiae, Agriculture and Environment

The Journal of Sapientia Hungarian University of Transylvania

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