Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Erciyes Üniversitesi, Ziraat Fakültesi, --, Türkiye
Tezin Onay Tarihi: 2017
Tezin Dili: İngilizce
Öğrenci: ABDUL-QUDDUS BAYUKO ABUBAKAR
Danışman: Abdullah Ulaş
Özet:
The effectiveness with which nitrogen (N) is used by corn (Zea mays L.) and other non-legume crops has become increasingly important because of increasing cost of manufacturing and distribution of chemical N fertilizers as well as its hazardous effects on the environment when used inappropriately. This along with the bad economic conditions of resource-poor farmers, has limited crop production, a threat to the world’s food security. Breeding and cultivating of efficient but high yielding varieties is thus the solution to this 21st century time bomb. The aim of this study was thus to screen some local maize varieties of Ghana for the genotypic differences in N efficiency and to identify and recommend the efficient but high performing varieties especially under low nitrogen conditions to plant developers and farmers. A total of 8 local maize cultivars (white Abontem, Honampa, yellow Abontem, Kunjorwari, Sanzalsima, Ewulboyu, Wandataa and Tintim) and 2 hybrids (OSSK 644 and DKC 7211) were grown on soilless media in a controlled growth chamber for 6 weeks with low (0.3 mM) and high (3.0 mM) nitrogen doses. The results showed that, the maize cultivars varied significantly in N uptake and utilisation abilities. Shoot dry weights were higher under high while root dry weights were higher under low N. Observed differences among varieties was significant. Basing on biomass production, Honampa, OSSK 644 and White Abontem were both efficient under low N and highly responsive under high N. Tintim and Ewulboyu were only responsive under high N supplies whereas Kujorwari was efficient under low N. All other varieties were neither responsive nor efficient. The well-developed strong root systems seemed to be the major contributing factor to N efficiency of the N efficient cultivars.