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首页> 外文会议>12th international technical meeting of the Satellite Division of the Institute of Navigation (ION GPS-99) >The Use of Global Positioning Systems and Aerial Photography to Determine Tiller Development in Wheat
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The Use of Global Positioning Systems and Aerial Photography to Determine Tiller Development in Wheat

机译：利用全球定位系统和航空摄影确定小麦分iller发育

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There is increasing evidence that early scouting ofrnwheat fields to determine tiller numbers can be useful inrndeciding when spring nitrogen (N) should be applied.rnUnfortunately, good tiller counts require a large amountrnof time and effort. Also, tiller counts can be extremelyrnvariable within a field making it difficult to get a goodrnaverage value without taking many samples. The solutionrnto this problem is to take advantage of remote sensing inrnthe form of aerial photography. Aerial photography usedrnwith the aid of information collected with a portablerndifferential global positioning system (DGPS) could helprndetermine tiller counts for the whole field and to examinernthe variability in tiller counts within a field. This approachrnwould have several benefits for wheat farmers. First, itrnwould reduce the time and effort required to scout tillerrnnumbers and, therefore, increase the use of tiller scoutingrnin managing wheat production. Second, it could helprndetermine the variability in wheat stands within a fieldrnleading to improvements in planting accuracy. Finally,rnaerial photography could be used to direct site-specificrnapplications of N which would reduce the amount of Nrnused while increasing the yield potential of the wheatrncrop.rnTo determine if aerial photography and precise fieldrnscouting using DGPS could be used to count tillers, fourrnexperiments were established on farm fields in NorthrnCarolina. Tiller counts were taken at GS 25 (Zadok’srnscale), and locations were marked using a DGPS receiver.rnAt the same time aerial photographs were taken usingrninfrared film.rnComparisons of tiller counts to amount of infraredrnband reflection found in the infrared photographs at GSrn25 showed a strong correlation. This research indicatesrnthat tiller counts could be determined using aerialrnphotography.
机译：越来越多的证据表明，对麦田进行早期侦查以确定分can数可能有助于确定何时应施用春季氮（N）。不幸的是，良好的分till数需要大量的时间和精力。而且，耕er数量在一个字段内可能会非常变化，从而使得在不获取大量样本的情况下很难获得良好的平均值。该问题的解决方案是利用航空摄影形式的遥感技术。借助便携式差分全球定位系统（DGPS）收集的信息使用的航空摄影可以帮助确定整个田间的分till计数，并检查田间分till计数的变异性。这种方法将给小麦种植者带来一些好处。首先，它将减少寻找分till数量所需的时间和精力，因此，在管理小麦生产中增加了分搜索的使用。其次，它可以帮助确定导致种植精度提高的田间小麦的变异性。最后，可以利用航空摄影技术指导特定地点的氮肥施用，这将减少氮肥的使用量，同时增加小麦的产量潜力。为了确定是否可以使用DGPS进行航空摄影和精确的田间侦查，以进行分till，建立了四个实验在NorthrnCarolina的农田上。在GS 25（Zadok'snscale）上进行分iller计数，并使用DGPS接收器标记位置。-同时使用红外胶片拍摄航空照片。-在GSrn25的红外照片中发现分er计数与红外波段反射量的比较相关性强。这项研究表明，可以使用航拍技术确定分till数。

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