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首页> 外文期刊>Ciência Rural >Temporal variation of normalized difference vegetation index (NDVI) and calculation of the crop coefficient (K c ) from NDVI in areas cultivated with irrigated soybean
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Temporal variation of normalized difference vegetation index (NDVI) and calculation of the crop coefficient (K c ) from NDVI in areas cultivated with irrigated soybean

机译：灌溉大豆种植区归一化植被指数（NDVI）的时空变化和基于NDVI的作物系数（K c）的计算

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摘要

Vegetation indices obtained by remote sensing products have various applications in agriculture. An important application of the Normalized Difference Vegetation Index (NDVI) is obtaining the crop coefficient (K c ). The aims of this study were to analyze NDVI temporal profiles and to obtain K c from the NDVI vegetation index product MOD13Q1. The analysis is based on the phenological stages of irrigated soybean crops in the municipality of Planura/MG during the 2010/2011 growing season. Areas planted with irrigated soybean were identified through fieldwork. Temporal series of the MOD13Q1 products were used to analyze NDVI, allowing the extraction of NDVI values for all points in the period studied. The NDVI temporal profiles showed a similar pattern to each other and corresponded to the crop cycle. The K cNDVI values for the MOD13Q1 products were well correlated to the FAO K c values (r 2 =0.72). Thus, NDVI can be used as an alternative for obtaining crop coefficient (K c ).
机译：通过遥感产品获得的植被指数在农业中具有多种应用。归一化植被指数（NDVI）的重要应用是获得作物系数（K c）。这项研究的目的是分析NDVI时间剖面，并从NDVI植被指数产品MOD13Q1获得K c。该分析基于Planura / MG市在2010/2011生长季节灌溉大豆作物的物候期。通过田间调查确定了灌溉大豆的种植区域。 MOD13Q1产品的时间序列用于分析NDVI，从而可以提取研究期间所有点的NDVI值。 NDVI时间剖面显示出彼此相似的模式，并对应于作物周期。 MOD13Q1产品的K cNDVI值与FAO K c值高度相关（r 2 = 0.72）。因此，NDVI可以用作获得作物系数（K c）的替代方法。

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