Screening Canola Genotypes for Resistance to Ammonium Toxicity

Soil ammonium toxicity can decrease plant growth, and many crop species have low resistance to ammonium, including canola, an economically important crop. Different genotypes may differ in their toxicity, therefore determining if there are that exhibit variation ability tolerate soil is a research priority. Here, we evaluate how impacts canola root shoot growth characterise differences among regard toxicity. In the first experiment, eight chloride treatments five calcium nitrate were tested for impact on genotype Crusher TT, where high application (60 mg N/kg soil) significantly decreased dry weight of shoots roots acidified from pHCaCl2 5.9 5.6. second 30 screened at selected concentrations NH4+-N, using as control. There was wide sensitivity NH4+-N application. Genotypes G16, G26, G29 had greater weights highest N concentration all genotypes, G28 up 35% higher compared with other genotypes. contrast, G3, G13, G30 showed largest reduction weight, G23, Residual NH4+-N/kg sensitive than resistant suggesting lower use former. These results reveal potential selecting soil.