The effect of rate and time of N application on its uptake by bread wheat varieties and soil characteristics on farmers' fields.
2000
Yesuf Assen and Duga Debele(Researchers)
AA field experiment was conducted to investigate the effect of rate and time of N application on soil characteristics and N uptake of two recently released bread wheat varieties. The experiment was conducted in Arsi zone of south-eastern Ethiopia at two locations (Bekoji and Eteya-Gonde) for two consecutive years (1995-96). The treatments consisted of three N-levels, namely 41, 82, 132 kg/ha including 0 kg N/ha applied on two bread wheat varieties (Qubsa(semi-dwarf) and Mitike(tall)). Nitrogen was applied either basal or split. The 14 treatment combinations were laid out in a randomized complete block design (RCBD) with three replications. The results indicated that application of N fertilizer increased yield and protein content, but resulted in soil acidification. The acidification was more pronounced at Bekoji where there was initially low soil pH and buffering capacity than at Eteya-Gonde. There was also considerable increase in mineral N content, nitrite and nitrate, with increasing N levels; the effect was higher when nitrogen was split applied at both locations. However, this effect was lower for the semi-dwarf than for the t all variety. This might be due to higher NO2- + NO3- -N uptake by the semi-dwarf variety. The bread wheat quality (protein content in this study) was significantly increased with N levels, for instance from 11.5% noted at 0 kg N/ha to 14.0% at 123 kg N/ha at Eteya-Gonde. The percentage protein content of the t all variety was superior to the semi-dwarf variety. However, the total nitrogen uptake and thus the nitrogen harvest index of the semi-dwarf variety were by far superior to that of the tall variety at both locations.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Ethiopian Institute of Agricultural Research