DOI: 10.5593/SGEM2016/B41/S17.078


V.Ion, A.G.Basa, M.Dumbrava, N. Ion
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-63-6 / ISSN 1314-2704, June 28 - July 6, 2016, Book4 Vol. 1, 603-608 pp

Maize (Zea mays L.) has a great potential to produce biomass which could be used for different energy purposes. In terms of biomass used as substrate for biogas production, the maize is of interest either as crop residues or as energy crop. As a matter of fact, maize is known to be one of the most used crops for producing biomass with the purpose to be transformed through fermentation process into biogas.
The energy crops are requiring a specific crop technology according to their purpose. Consequently, maize as energy crop has to have a specific technology for producing biomass, which has to be adjusted to the specific growing conditions, especially to the climatic and soil conditions. Among the specific crop technology elements, the preceding crop and the row spacing are of great interest. These technology elements are among those not requiring any specific costs, they relying on the knowledge to choose the appropriate preceding crop in a crop rotation and the suitable row spacing when the decision of crop establishment is taken.
The aim of the paper is to present the biomass yield that could be obtained at maize under different preceding crops and row spacing conditions in the conditions of a drought year. In this respect, ten maize hybrids were studied under three preceding crop conditions (triticale, maize, and sunflower) and at three row spacing (70 cm, 50 cm, and twin-rows of 70/40 cm). Researches were carried out in a field experiment, under rainfed conditions, in the year 2015, which was warmer and drier than normal years for the studying area, being a drought year. The field experiment was located at Moara Domnească Experimental Farm (44o29’ N latitude and 26o15’ E longitude) belonging to the University of Agronomic Sciences and Veterinary Medicine of Bucharest.
The biomass determinations were performed in the early dough - dough plant growth stages, these being the growth stages of the maize plant when the above-ground biomass is of interest to be used as substrate for biogas production. For each experimental variant, there was determined the yield of above-ground fresh and dry biomass, which were expressed in tons per hectare. The highest dry biomass yields as average values of the ten studied maize hybrids were obtained in the case of sunflower as preceding crop and twin-rows of 70/40 cm as row spacing. Because of the drought that characterized the year 2015 in the studied area, the dry biomass yields did not exceeded 10 tons.ha-1.

Keywords: biomass yield, maize, preceding crop, row spacing, renewable energy.