Zhou Zhiguo, Meng Yali, Shi Pei
MOA Key Laboratory of Crop Growth Regulation, Nanjing Agricultural University, Nanjing 210095.
Ying Yong Sheng Tai Xue Bao. 2002 Aug;13(8):997-1000.
The effect of shading during symbiotic stage of inter-cropped cotton and wheat on cotton yield and its quality formation was examined by simulated shading at the seedling stage of cotton. The results showed that the effect of shading on the cotton boll formation depended upon the position of fruiting branch and fruiting bud. For the bolls at low(1-3 fruiting branches) and middle(4-6 fruiting branches) parts and the inside bolls(1-2 fruiting buds) on upper(7-9 fruiting branches) fruiting branch, shading favored boll formation, but for the outside bolls (> or = 3 fruiting buds), especially at the top fruiting branch position, shading was unfavorable to boll formation. The effect of shading on the weight of individual boll also depended upon the position of fruiting branch and fruiting bud, but shading did not affect the mean boll weight per plant. For seed cotton yield per plant, the inside boll yield of shaded low and middle fruiting branches was higher than the control, but that of the upper and top fruiting branches was just contrary, the yield of outside bolls of all branches was lower than the control. For the distribution of the inside and outside bolls, shaded cotton was 1:0.36, versus 1:0.58 for the control. For the yield distribution, shaded cotton was 1:0.42, versus 1:0.72 for the control. The effect of shading on the cotton fiber and seed quality was mainly restricted on the bolls of top fruiting branches and the outside bolls of upper fruiting branches. The results also showed that different cotton varieties were different in their shade-tolerance, according to comprehensive analysis of the yield and quality formation, and the shade-tolerance of variety Zh9418 was stronger than that of Zh19 and CAZ.
通过在棉花苗期进行模拟遮光试验，研究了间作棉麦共生期遮光对棉花产量及其品质形成的影响。结果表明，遮光对棉铃形成的影响取决于果枝和果节的位置。对于下部（1 - 3个果枝）和中部（4 - 6个果枝）果枝上的棉铃以及上部（7 - 9个果枝）果枝内侧果节（1 - 2个果节）的棉铃，遮光有利于棉铃形成，但对于外侧果节（≥3个果节），尤其是顶部果枝位置的棉铃，遮光不利于棉铃形成。遮光对单铃重的影响也取决于果枝和果节的位置，但遮光不影响单株平均铃重。对于单株籽棉产量，遮光处理下下部和中部果枝内侧棉铃产量高于对照，但上部和顶部果枝则相反，各果枝外侧棉铃产量均低于对照。对于内外棉铃分布，遮光棉为1:0.36，对照为1:0.58。对于产量分布，遮光棉为1:0.42，对照为1:0.72。遮光对棉纤维和种子品质的影响主要局限于顶部果枝的棉铃和上部果枝的外侧棉铃。结果还表明，不同棉花品种的耐荫性不同，综合产量和品质形成分析，品种中9418的耐荫性强于中19和CAZ。
