Effect of Timing of N Fertilizer and PGR on N Uptake and Utilization in Wheat
2000
David A. Bull | ZHANG Guo-ping | CHEN Jin-xin
The effect of timing of N fertilizer and plant growth regulators (PGRs) on N uptake and utilization in wheat plants was studied. It was shown that both N and PGRs applications had significant effect on plant N content, accumulation and utilization. Treatments involving S<sub>3307</sub> had higher N content than the untreated ones. GA3 treated plants contained higher N compared to S<sub>3307</sub> or control. The combined treatment of S3307 and GA3 contained higher N in all growth stages. There were genotypic differences in N content with Yangmei 5 having higher N content at booting in leaf and stem, but the results were opposite at maturity. S<sub>3307</sub> reduced N accumulation by inhibiting dry matter production, while GA3 increased N accumulation and modified the inhibiting action of S3307. Differences also existed in terms of Nitrogen utilization efficiency (NUE) and Nitrogen efficiency ratio (NER) between cultivars and among PGR treatments. Yangmei 5 had higher NUE and NER than ZAU 941. The combined treatment had significantly higher NUE and NER than the S3307 or GA3 alone treated plants.
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