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棉 花 学 报 Cotton Science 2008，20(1)：29-33
Effects of Different Tillage Treatments on the Senescence Physiological Characteristics of the Fruit Branch Leaves in the Different Positions of Cotton Plant Abstract：Using insect-resistant transgenic Bt varieties (Bacillus thuringiensis)，cotton 33B and Nongdamian 6,applying plowing，rotary tillage，direct drilling as treatments，the physiological characteristics of different positions fruit branch leaves were studied. The experiments were carried out at the teaching and experiment station （Baoding，Hebei Province）of Agricultural University of Hebei, in 2005 and 2006. The result showed: 1）The content of chlorophyll and dissoluble protein of different positions fruit branch leaves reduced along a sequence of plowing > rotary tillage> direct drilling; 2) MDA reduced along a sequence of direct drilling> rotary tillage>plowing. The trends are identical in both varieties.It indicates that plowing is propitious to delay the senescence of fruit branch leaf，the senescence phenomenon of direct drilling is severest，that of rotary tillage is in the middle. Compared with 33B ， the content of chlorophyll and dissoluble protein of Nongdamian 6 in middle and late phases was more than that of 33B，the content of MDA was less than that of 33B，which indicated that the capability of antisenescence of Nongdamian 6 was stronger than 33B.
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