Response of Different Maize Genotypes to Low Nitrogen Stress and Trait Selection of Low Nitrogen Tolerant Varieties
In order to screen out the maize varieties with low-nitrogen tolerance,and provide the technologies for identifying and screening low-nitrogen-resistant corn varieties,36 corn cross combinations were used as test materials,the phenotypic value of genotypic agronomic traits was determined under the condition that the amount of nitrogen used was reduced by 70%compared to the normal amount of nitrogen applied.Based on the phenotypic value,the comprehensive coefficient of low nitrogen stress was calculated,and then the genotype's ability to low nitrogen resistance was evaluated.The results showed that there were significant or very significant differences in the performance of most agronomic traits among different genotypes under low nitrogen stress.The comprehensive coefficient of low nitrogen stress varied greatly among 36 genotypes,with a maximum value of 1.0319,a minimum value of-0.1139,and an average of 0.4506.There were 6 and 4 genotypes with very significantly and significantly greater coefficients than the average,respectively;16 genotypes had no significantly different from the average;there were 2 and 8 genotypes with significantly and very significantly smaller coefficients than the average,respectively.Genotypes with extremely significant and significantly greater coefficients than the average were rated as varieties with strong and stronger low-nitrogen resistances.Vigorous growth,higher plants,and wide ear leaves could be used as important characteristics for selecting low-nitrogen-resistant varieties under low-nitrogen stress.
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