Year 2019, Volume 4, Issue 1
| Year : | 2019 |
| Volume : | 4 |
| Issue : | 1 |
| Authors : | Svetla KOSTADINOVA, Zivko TODOROV, Ivan VELINOV |
| Title : | EFFECT OF NITROGEN ON THE ACCUMULATION AND REUTILIZATION OF DRY MASS IN GRAIN SORGHUM |
| Abstract : | Accumulation and reutilization of dry mass until anthesis and during a grain filling period of sorghum in response to nitrogen fertilization in rates 0, 60, 120, 180, 240 and 300 kg N.ha-1 was studied in a field experiment. Grain sorghum hybrid EC Alize was grown under not- irrigated conditions in the experimental field of Agricultural University of Plovdiv, Bulgaria. The experimental design was a randomized, complete block design with four replications with a size of experimental plots of 20 m2 after wheat as predecessor. Standard farming practices for the region of Southern Bulgaria were applied. It was established that nitrogen fertilization significantly increased the amount of accumulated dry mass at anthesis and total above ground dry mass at maturity compared to N0. Not significant effect of higher rates (180, 240 and 300 kg N.ha-1) on the dry mass accumulation of sorghum was found. Average post anthesis net dry mass accumulation was 3291 kg.ha-1 and its amount increased in parallel with the nitrogen rate up to N180. The highest dry mass translocation, translocation efficiency, and contribution of pre-anthesis assimilations of the grain was established at nitrogen rate N120 with values 2073 kg.ha-1, 25.0 % and 41,8 %, respectively. Growth of sorghum at higher nitrogen rates N180, N240, N300 significantly decreased efficiency of dry mass translocation and contribution of pre-anthesis assimilations of the grain. Nitrogen fertilization had very strong negative correlation with dry mass translocation efficiency (-0.860*) and contribution of pre-anthesis assimilations of the grain (-0.863*). Very strong positive correlation (0.988**) was found between dry mass translocation efficiency and contribution of pre-anthesis assimilations of the grain. |
| For citation : | Kostadinova, S., Todorov, Z., Velinov, I. (2019). Effect of nitrogen on the accumulation and reutilization of dry mass in grain sorghum. AGROFOR International Journal, Volume 4. Issue No. 1. pp. 50-56. DOI: 10.7251/AGRENG1901050K |
| Keywords : | Grain sorghum, Nitrogen, Dry mass, Reutilization |
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ISSN 2490-3434 (Printed)
ISSN 2490-3442 (Online)
ISSN 2490-3442 (Online)
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