| Effect of zinc application on net assimilation rate of different cotton growth stages |
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| DOI：10.7606/j.issn.1000-7601.2010.01.18 |
| Key Words: zinc cotton net assimilation rate(NAR) dynamics |
| Author Name | Affiliation | | ZHI Jinhu | College of Plant Science, Tarim University, Alar， Xinjiang 843300, China
Cotton Science Institute of Tarim University, Alar, Xinjiang 843300， China | | NIE Yunjiang | 30th Regiment of No.2 Agriculture Division of Xinjiang Production and Construction Group, Korla, Xinjiang 841006, China | | WAN Sumei | College of Plant Science, Tarim University, Alar， Xinjiang 843300, China |
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| Abstract: |
| Dynamic regulation of cotton net assimilation rate(NAR) was studied under zinc application by field experiment. The results showed that with the increased use of zinc, the yield had a tendency of increasing f
irst and decreasing then; and as the process of growth and development of cotton, NAR had a tendency of increasing first and decreasing then. In the period of flourishing budding to flourishing flowering, NAR reached the maximum. With the enhancement of zinc dosage, NAR increased at growth prophase
and decreased at metaphase to anaphase obviously. After bell period, the response of NAR to exogenous zinc showed very exceptional, and regardless of the amount of zinc fertilized, NAR was always lower than that of control. At the period of full flowering to bell, whether the relationship of NAR and zinc amount is linear, exponential or a quadratic curve type, they all reached a significant level. Nevertheless, the quadratic curve was fitting better. Thus, by studying the effect of zinc application on net assimilation rate of different cotton growth stages, we may obtain some new ideas of rational fertilization for cotton cultivation. |
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