Response of six wheat varieties to different nitrogen rates
1985
El-Khattari, S.K. (Jordan Univ., Amman (Jordan))
Response of six wheat varieties to different rates of nitrogen was studied. Four of these varieties ACSAD 59, 65, 67 and 71 were recently introduced to Jordan while the other two (F-8 and Horani) are commonly used local varieties. There were significant effects for the variety and fertilizer on the yield of dry matter. In two varieties the dry weight of tops increased with increasing nitrogen rates, while in the other four varieties the yield increased up to 8 kg N/D then decreased or showed no increase at 16 kg N/D. The best N rate that gave the most dry matter was 8 kg N/D. The varieties F-8, Horani, and ACSAD 71 gave higher dry matter than the rest. The N concentration in the plants was affected by variety, N-fertilizer rate and their interactions. Concentration of N in F-8, Horani, and ACSAD 71 which had a range from 0.9 to 1.6% was lower than that in the other varieties which had a range from 1.1 to 2.9%. The total N uptake was affected also by variety and fertilizer but there was no interaction. Total N uptake by tops of F-8, Horani, and ACSAD 71 at 8 kg N/D was greater than the others. Efficiency of N uptake from the medium N level (8 kg N/D) was in the order of ACSAD 71 Horani = F-8 ACSAD 59 ACSAD 65 ACSAD 67. All varieties showed normal green colour at the rate of 8 kg N/D and pale green to yellow at the lower N rate. Heading was 5-15 days earlier in ACSAD 59, 65, and 67 than in F-8, Horani, and ACSAD 71 varieties
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