In 2004 at the Maricopa Agricultural Center located near Maricopa, AZ, severe thunderstorms with damaging hail occurred on July 27. The hail storm resulted in adjusted losses of 40 to 70% to cotton (Deltapine 449 BR planted on April 17) at the cutoutstage (nodes above white flower of 5 or less). An experiment was conducted to determine the effects of continuing the growing season and the impact on defoliant efficacy. The experiment was a split plot design with main plots consisting of two irrigationtermination treatments (short season and full season), while subplots consisted of six defoliation treatments. Short season treatments had one additional irrigation following the hail event while the full season cotton received three additional irrigations. Defoliation treatments included Ginstar at 8 oz/A, Ginstar at 7 oz/A plus Def at 7 oz/A, Ginstar at 8 oz/A plus Aim at 1 oz/A plus crop oil concentrate (COC) at 1% v/v, Ginstar at 6 oz/A plus Aim at 1 oz/A plus COC at 1% v/v, Def at 24 oz/A plus Dropp at 0.2 lb product/A, and Aim at 1 oz/A plus COC at 1% v/v. Regardless of defoliation treatment applied, % open boll at the time of harvest was decreased by extending the growing season. Cotton defoliation (%) was not impacted by the irrigation treatments and was at least 87% at 14 days after treatment for all treatments except Aim. A season length by defoliation treatment interaction was observed for % desiccation. When applied to short season treatments, Ginstar, Ginstar plus Def, and Def + Dropp showed significantly higher desiccation than the remaining treatments. This was likely due to higher temperatures at the time of application for the short season cotton. When averaged across all defoliation treatments cotton yield for full season treatments was increased by 107 lbs lint/acre compared with the short season plots. Likewise fiber micronaire was significantly higher for the full season treatments but all treatments exceeded 5.0. Differences for all other fiber quality characteristics were not observed.
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机译：2004年，位于阿兹马里卡省的MariCopa农业中心，在艾兹的严重雷雨，7月27日发生了破坏性冰雹。冰雹风暴导致棉花（4月17日在4月17日种植的Deltapine 449 Br）调整后的损失为40％至70％）在Cutoutstage（白花上面的节点为5或更小。进行了一个实验，以确定继续生长季节的影响和对脱发效果的影响。该实验是一种分体上行结构，主要图包含两种调整细胞治疗（短季和全季节），而子尺包括六种落叶治疗。在冰雹事件之后，短季治疗在冰雹事件之后有一个额外的灌溉，而全季棉花接受过三种额外的灌溉。落叶处理包括8盎司/ a的金刚石，在7盎司/ a加50点的金刚石，8盎司/ a加上的金刚石瞄准为1盎司/ a加上的射水浓缩物（COC），1％v / v ，在6盎司/ A的GINSTAR PORD以1％v / a加上COC为瞄准1％v / v，在0.2磅产品/ a的24盎司/ a加上DOPP，瞄准1盎司/ A加COC 1％ v / v。无论应用脱落治疗，通过延长生长季节，收获时的％开放式铃铛降低。灌溉治疗不受灌溉治疗的影响（％），除目标外，治疗后的所有治疗后的14天均未受到影响。观察到通过落叶处理相互作用的季节长度以获得％干燥。当应用于短季治疗时，Ginstar，Ginstar Plus Def和Def + Dropp显示出比其余处理显着更高的干燥。这可能是由于施用短季棉花时的较高温度。当所有落叶处理的平均处理时，与短季节图相比，全季节治疗的棉花产量增加了107磅的棉绒/英亩。同样纤维微素料对于整个季节治疗显着高，但所有治疗均超过5.0。未观察到所有其他纤维质量特征的差异。
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