摘要
The impacts of planting date and nitrogen fertilization on cotton （Gossypium hirsutum L.） photosynthesis and soluble carbohydrate contents in relation to silverleaf whitefly, Bemisia tabaci （Gennadius） biotype “B”, populations were examined in field experiments. Cotton planted in late April and early June was treated with 0, 112, 168 and 224 kg/N hectare in soil using urea fertilizer. The mean photosynthetic rate of April-planted cotton was 4%-20% higher than that of June-planted cotton early in the season, but 10%- 18% lower than that of June-planted cotton late in the season. The photosynthetic rates for both planting dates were positively correlated with levels of added nitrogen. While levels of glucose for both planting dates were positively correlated with nitrogen levels, fructose and sucrose levels were not. The mean levels of fructose were up to 40% lower, while that of sucrose were up to 59% higher, in April-planted cotton than in June-planted cotton. Levels of photosynthetic rate or stomatal conductance were not correlated with adult whitefly densities for either planting date. Levels of glucose and fructose were positively correlated with whitefly densities only for June-planted cotton late in the season.
在在与银叶白色的关系的光合作用和可溶的碳水化物含量飞的棉花(Gossypiumhirsutum L.) 上种日期和氮授精的影响， Bemisia tabaci (Gennadius ) 遗传因子型“ B ”，人口在地实验被检验。在迟了的 4 月和早 6 月的 Cottonplanted 用尿素肥料在土壤与 0,112,168 和 224 kg/N 公顷被对待。种 4 月的棉花的吝啬的光合的率是 4%—20% 高在季节晚比种 6 月的棉花的比在季节，而是 10%-18% 早的种 6 月的棉花的降低。为两个都种日期的光合的率断然与增加的氮的层次被相关。当为两个都种日期的葡萄糖的层次断然与氮层次被相关时， fructose 和蔗糖层次不是。当蔗糖的更高是多达 59% 时， fructose 的层次在 to40% 上面的平均数降低，在比在 June-plantedcotton 的种 4 月的棉花。光合的率或有气孔的传导力的层次没被相关与 adultwhitefly，为种的任何一个的密度标明日期。葡萄糖和 fructose 的层次断然在季节晚仅仅为种 6 月的棉花与白苍蝇密度被相关。
