REMOTE-SENSING OF CROP COEFFICIENTS FOR IMPROVING THE IRRIGATION SCHEDULING OF CORN
REMOTE-SENSING OF CROP COEFFICIENTS FOR IMPROVING THE IRRIGATION SCHEDULING OF CORN
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DOI：
10.1016/0378-3774(95)01125-3
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发表时间：
1995-04-01
影响因子：
6.7
通讯作者：
BAUSCH, WC
中科院分区：
文献类型：
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作者：
BAUSCH, WC
改进灌溉水管理需要精确的灌溉调度，而灌溉调度又需要精确计算每日作物蒸散量(E(T))。Neale等人之前的工作。(1989)和Bausch(1993)指出，玉米基于反射率的作物系数(K(Er))响应了作物生长异常，应该改善灌溉制度。因此，本研究的目的是开发一种在灌溉制度中使用K(Cr)的新方法，并给出比较不同玉米基本作物系数(K(Eb))曲线的模拟结果，以评估它们对估计作物E(T)的影响。灌溉计划模拟是使用SCHED，USDA-ARS灌溉计划程序和三条K(EB)曲线(SCHED，Wright‘s(1982)表格数据中的一条，以及基于K(Cr)的K(Cb))进行的。在营养生长期间(60~100 mm)，使用SCHED中的K(Cb)曲线模拟的作物用水量比使用Wright的K(Cb)或K(Cr)导出的K(Cb)曲线模拟的作物在三个生长季节的用水量要大得多。在每个生长季节，以K(Cr)为基础的K(Cb)和赖特K(Cb)之间的作物用水量相差约20 mm。K(Cr)曲线1990年和1992年作物用水量较少，1991年作物用水量较大；作物发展是造成这种差异的直接原因。尽管赖特和K(Cr)基本作物曲线之间的差异很小，但以K(Cr)为基础的K(Cb)灌溉时间更合适。正确的灌溉时间可以使过度灌溉和灌溉不足最小化。
Improved irrigation water management requires accurate scheduling of irrigations which in turn requires an accurate calculation of daily crop evapotranspiration (E(t)). Previous work by Neale et al. (1989) and Bausch (1993) have indicated that the reflectance-based crop coefficient (K(er)) for corn responded to crop growth anomalies and should improve irrigation scheduling. Thus, the purpose of this study was to develop a new procedure for using the K(cr) in irrigation scheduling and present results of simulations comparing different basal crop coefficient (K(eb)) curves for corn to evaluate their effects on estimated crop E(t). Irrigation scheduling simulations were performed using SCHED, the USDA-ARS Irrigation Scheduling Program, and three K(eb) curves (the one in SCHED, Wright's (1982) tabular data, and the K(cr)-based K(cb)). Simulated crop water use using the K(cb) curve in SCHED was considerably greater during vegetative growth (60 to 100 mm) than simulated crop water use using Wright's K(cb) or the K(cr) derived K(cb) curves for three growing seasons. Crop water use between the K(cr)- based K(cb) and Wright's K(cb) were different by approximately 20 mm each growing season. Crop water use was less in 1990 and 1992 for the K(cr) derived curve and greater for 1991; crop development was directly responsible for the differences. Although the differences between the Wright and K(cr) basal crop curves were minimal, irrigations with the K(cr)-based K(cb) were more appropriately timed. Irrigations that are correctly timed minimize overirrigation as well as underirrigation.