Document Type : Articles
Authors
Biotechnology and Crop Science Dept., College of Agricultural Sciences, University of Sulaimani
Abstract
To investigate the growth and yield of two bread wheat varieties Alaa and Hasad in two different agro-climatic zones (ACZ), two different field experiments were carried out in Sulaimani and Halabja agro-climatic zones(SAZ and HAZ) during the 2019-2020 season. The wheat varieties were treated with three levels of nitrogen fertilization ( 80, 120, and 160 ) Kg ha-1 as N1, N2, and N3 and foliar application of trace elements Zn as (ZNSO4) and Fe (FeSO4.7H2O) 0.5 g/ 750ml, during the reproductive stage with 15 days difference among them. Differences in the thermal capacity as accumulated Growing Degree Days (GDD) between both agro-climatic zones resulted in significant variation in the growth performance of both varieties. The accumulation of dry matter was evaluated along the growing season through seven sampling dates with two weeks interval. There were differences in the relative growth rate(RGR) of both varieties in both ACZs, and the RGR of Alaa variety in SAZ was (0.131 to 0.190) g g-1 d-1, while it recordes at Halabja agroclimatic zone between (0.172 – 0.221)g g-1 d-1. However, the RGR of Hasad was between (0.135-0.207) g g-1d-1 at SAZ and (0.185-0.253)g g-1d-1 at HAZ. The higher results of GDD, the total grain yield, biological yield, and harvest index at HAZ can be explained by favorite conditions provided at HAZ than that obtained at SAZ. That exhibited in optimum mebolization of applied fertilization and higher heat use efficiency at HAZ(2.219 and 3.327kg grain ha-1 deg days-1 for Alaa variety with V1N2F0 and V1N3F0 respectively, and Hasad variety showed 2.045 and 2.818 kg grain ha-1 deg days-1 with V2N1F0 and V2N3F0 respectively. Differences in thermal capacity of different locations can be used for classification of agricultural zones in future studies.
Keywords
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