A single field study was conducted in 1995 at the Marana Agricultural Center (2000 f elevation) to evaluate the effects of three planting dates on yield and crop development for one Pima and two Upland varieties. Planting dates ranged from 6 April to 18 May (469 -931 HU /Jan 1 86/55° F thresholds). Crop monitoring revealed vegetative growth tendencies with later plantings. General trends showed decreasing lint yield with the later (18 May) plantings for all varieties. Early plantings (6 April) however, for both Pima S-7 and DPL 20 resulted in slightly lower yields than the later two planting dates. This reduced yield for planting date 1 can be explained by extremely cool weather conditions which occurred immediately after planting and in-season fruit loss which impacted the final fruit retention levels.
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机译：1995年在马拉纳农业中心（海拔2000英尺）进行了一次田间研究，以评估三种播种日期对一种皮马和两种高地品种的产量和作物生长的影响。播种日期为4月6日至5月18日（469 -931 HU / Jan 1 86/55°F阈值）。作物监测显示出后期种植的营养生长趋势。总体趋势显示，所有品种后期（5月18日）播种时皮棉产量下降。但是，Pima S-7和DPL 20的早期播种（4月6日）导致产量比后两个播种日期略低。播种日期1产量下降的原因可以是播种后立即发生的极端凉爽的天气条件和季节内水果损失，这影响了最终的水果保鲜水平。
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