Bread wheat varieties influenced by different levels of Nitrogen and phosphorous grown in calcareous soil

1 Mohammed Ali Hussain Al-Falah , 2 Mohammed-Sedqi. Salih. M. Dohuki
Dept. Field Crop, Faculty of Agriculture and Forestry, University of Duhok, 2 Dept. Soil and water Science, Faculty of Agriculture and Forestry, University of Duhok.

Field trails were conducted at the field of the Faculty of Agriculture and Forestry/
university of Duhok/ Semmel District- Duhok Governorate/ Kurdistan region/ Iraq,
which located in semi-arid zone, during seasons 2008-2009 and 2009-2010, to study the
effect of different levels of Nitrogen and Phosphorous (0.0, 60, 120, and 180) kg N. ha-1
,(0.0, 183.2, 229.0, and 274.8) kg P2O5. ha-1respectively, on leaf area (cm2), plant high
(cm), number of spikes. plant-1, number of grains. spike -1, 1000 grain weight, grain
yield (g). plant-1, of two varieties (Rezgary and Fateh) under rain feed conditions, in silty
clay texture soil (classified as Vertisols), characterized as high calcium carbonate, low
organic matter content and high pH value. The results showed highly significant effect
of year in all studied traits with exception number of grains per spike and the varieties
exhibited highly significant effect in plant height, leaf area, 1000 grain weight and grain
yield . plant-1. The interaction effect between Nitrogen, Phosphorous, and varieties,
shows highly significant effects for all traits except number of grains. spike-1
Alsointeraction effects between (Years × Variety × Nitrogen × Phosphorous) gave high
significant effects in all studied traits with exception of plant height and number of
grains. spike-1.

Key words: Bread wheat varieties, Nitrogen, Phosphorous levels, grain yield.


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