Effects of Plant Pruning and Plant Population Density on Yield and Fiber Quality of Cotton in a Garlic-cotton Intercropping System
Field experiments were conducted in three sites to study the effects of plant pruning mode (with or without vegetative branches) and plant density (2.7×104,3.3×104,3.9×104,4.5×104 plants· hm-2) on yield and fiber quality of cotton in a garlic-cotton intercropping system in southwestern Shandong province.The results showed that pruning mode,planting density or their interaction had no significant effect on cotton fiber quality,but there e×isted a significant interaction effect of pruning mode and planting density on cotton yield.Three combinations,3.3×104 plants ·hm-2 with vegetative branches (VB),2.7×104 plants·hm-2 with VB,and 3.3×104 plants·hm-2 without VB,improved lint yield by 20.4％,9.2％ and 10％,respectively,compared with the traditional cultivation method(2.7×104 plants·hm-2 without VB).They were also significantly higher than other treatment combinations in lint yield.Increased plant density,maitaining VB or their combination significantly increased biomass,but decreased the harvest index.Compared with traditional cultivation method,3.3×104 plants·hm-2 with VB,2.7×104 plants·hm-2 with VB and 3.3×104 plants·hm-2 without VB increased biomass by 13.7％,27.8％ and 11.6％,decreased harvest index by 5.3％,11.5％ and 4.5％,respectively.Significant improvement on lint yield by the three combinations was attributed to the increased biomass and total number of bolls per unit area on the basis of maintaining relatively higher harvest index and boll weight.It is concluded that appropriate increase in plant density combined with maintaining VB is an important practice to improve cotton yield and benefit in the garlic-cotton intercropping system.
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