Determination of growth-stage-specific crop coefficients (KC) of maize and sorghum
Determination of growth-stage-specific crop coefficients (KC) of maize and sorghum
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DOI：
10.1016/j.agwat.2009.06.024
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发表时间：
2009-12
影响因子：
6.7
通讯作者：
G. Piccinni;Jonghan Ko;T. Marek;T. Howell
中科院分区：
文献类型：
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作者：
G. Piccinni;Jonghan Ko;T. Marek;T. Howell
作物蒸发蒸腾量（ETC）与参考蒸发蒸腾量（ETO）的比值决定了作物系数（KC）值，该值与特定作物的物候发育有关，以提高KC值的可传递性。KC的开发可以帮助利用气象站的气象数据预测作物灌溉需求。本研究的目的是确定2002年至2008年在美国德克萨斯州Uvalde的德克萨斯农业生命研究场玉米（Zea Mays）和高粱（Sorghum bicolor）生长阶段特定的KC和作物用水。7个蒸渗仪，重约14 Mg，由1.5m×2.0m×2.2m深的原状土块组成。六个蒸渗仪位于一个1公顷的领域下的线性移动洒水系统配备了低能量精度应用（LEPA）的中心。建立第七个蒸渗仪来测量参考草ETO。玉米和高粱的作物需水量、KC-determination以及与FAO现有KC-values的比较都是在3年内确定的。玉米季节性作物累计用水量在441至641毫米之间，高粱在491至533毫米之间。在生长季节测定的KC值变化范围为0.2至1.2玉米和0.2至1.0高粱。有些值与FAO-56和得克萨斯州高平原以及其他州的其他地方的值相符，有些不相符。我们假设，基于区域和特定生长阶段的KChelps在灌溉管理的发展，并为该地区提供精确的水应用。
A ratio of crop evapotranspiration (ETC) to reference evapotranspiration (ETO) determines a crop coefficient (KC) value, which is related to specific crop phenological development to improve transferability of the KCvalues. Development of KCcan assist in predicting crop irrigation needs using meteorological data from weather stations. The objective of the research was conducted to determine growth-stage-specific KCand crop water use for maize (Zea Mays) and sorghum (Sorghum bicolor) at Texas AgriLife Research field in Uvalde, TX, USA from 2002 to 2008. Seven lysimeters, weighing about 14Mg, consisted of undisturbed 1.5m×2.0m×2.2m deep soil monoliths. Six lysimeters were located in the center of a 1-ha field beneath a linear-move sprinkler system equipped with low energy precision application (LEPA). A seventh lysimeter was established to measure reference grass ETO. Crop water requirements, KCdetermination, and comparison to existing FAO KCvalues were determined over a 3-year period for both maize and sorghum. Accumulated seasonal crop water use ranged between 441 and 641mm for maize and between 491 and 533mm for sorghum. The KCvalues determined during the growing seasons varied from 0.2 to 1.2 for maize and 0.2 to 1.0 for sorghum. Some of the values corresponded and some did not correspond to those from FAO-56 and from the Texas High Plains and elsewhere in other states. We assume that the development of regionally based and growth-stage-specific KChelps in irrigation management and provides precise water applications for this region.