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Subsurface Drip Irrigation Placement and Cotton Irrigation Water Requirement in the Tennessee Valley

机译：田纳西河谷地下滴灌位置和棉花灌溉需水量

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摘要

Fluctuations in dryland cotton yield in the Tennessee Valley region of northern Alabama are common and are usually related to irregular drought periods during the growing season. Subsurface drip irrigation (SDI) has gained popularity as a water delivery system for small, irregular-shaped cotton fields. A seven-year study was conducted with the objective to determine the response of seed cotton yield to SDI tape orientation relative to crop row direction and different irrigation rates under dryland conditions of the Tennessee Valley. Seven treatments were tested in a randomized incomplete block design which consisted of three irrigation treatments (33%, 66%, and 99% pan evaporation), two SDI tape orientations (parallel and perpendicular), and a dryland control. All SDI treatments produced yields significantly higher than non-irrigated, dryland cotton in four out of seven years. Maximum yield was obtained at a median pan evaporation water replacement value of 74%. No statistical differences were observed between SDI tape orientations on seed cotton yield in all years except in 1999 when parallel out yielded perpendicular at lower irrigation rates. Results confirm the long-term efficacy of supplemental irrigation to increase seed cotton yield irrespective of SDI tape placement during sporadic periods of drought. These results are applicable only for fields with the same soil type or with similar water movement characteristics.
机译：阿拉巴马州北部田纳西河谷地区的旱地棉花产量波动很普遍，通常与生长期的不规则干旱时期有关。地下滴灌（SDI）作为用于小型不规则形状的棉田的输水系统而广受欢迎。进行了为期七年的研究，目的是确定田纳西山谷干旱地区条件下，籽棉产量对相对于作物行方向和不同灌溉速率的SDI胶带取向的响应。在随机不完全区组设计中测试了七个处理，包括三个灌溉处理（33％，66％和99％锅蒸发），两个SDI胶带方向（平行和垂直）和一个旱地对照。在七分之四的四年中，所有SDI处理产生的产量均显着高于非灌溉的旱地棉花。在中值蒸发蒸发水的中值替代值为74％时获得了最大产量。除1999年平行灌溉在较低灌溉速率下垂直种植外，所有年份中SDI播种带取向对籽棉产量没有统计学差异。结果证实，在干旱的偶发时期，无论使用SDI胶带放置什么，补充灌溉都能长期提高籽棉产量。这些结果仅适用于具有相同土壤类型或具有相似水分运动特性的田地。

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