ÃÞ »¨ ѧ ±¨ Cotton Science 2010£¬22£¨3£©£º260~266
The Effect of Different Density to Canopy-Microclimate and Quality of Cotton Abstract: In order to study the effects of different density to the micro-climate of cotton canopy and the relationship between cotton physiology characteristic and its quality, we has designed five kinds of different densities in field study. The results indicated that the transmittance of different crown level after first flowering dropped rapidly, in different crown level the transmittance A3 (180000 plants per hectare) became the highest. In the flowering season air temperature was the highest by A3 when the crown level was 20 cm . After the boll opening, the regularity was not obvious. In the flowering season relative humidity was high, but its change was small. The relative humidity was the stablest by A3, and the change was the smallest. The change was big by other treatments. In the boll opening period, change tendency of relative humidity was consistent basicly in different crown levels, the relative humidity was a little higher in the morning and evening, the regularity was not obvious among different treatments. The yield of ginned cotton in A3 was the highest, the LAI peak appeared during the cotton bolling period, it still maintained 2.5~2.6 at the boll opening stage. The leaves of tenth fruit branches senesced in August 14th, after 5 days began the eighth fruit branches, A3 could maintain the normal physiological condition longer. Cotton textile fiber quality of different treatments had no significant difference, the increasing of the density could promote the fiber quality, but it had negative effect on the fiber quality beyond the density of A4(225000 plants per hectare).
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