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Please use this identifier to cite or link to this item:
http://hdl.handle.net/10174/19605
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Title: | Monitoring pasture variability: optical OptRx® crop sensor versus Grassmaster II capacitance probe |
Authors: | Serrano, João Shahidian, Shakib Marques da Silva, José |
Keywords: | Sensors NDVI Grassmaster Pastures Monitoring |
Issue Date: | 2016 |
Publisher: | Springer |
Citation: | Serrano, J., Shahidian, S., Marques da Silva, J.(2016). "Monitoring pasture variability: optical OptRx® crop sensor versus Grassmaster II capacitance probe". Environmental Monitoring and Assessment, 188(2): 1-17. |
Abstract: | Estimation of pasture productivity is an important step for the farmer in terms of planning animal stocking, organizing animal lots, and determining supplementary
feeding needs throughout the year. The main objective of this work was to evaluate technologies which have potential for monitoring aspects related to
spatial and temporal variability of pasture green and dry
matter yield (respectively, GM and DM, in kg/ha) and
support to decision making for the farmer. Two types of sensors were evaluated: an active optical sensor(OptRx®, which measures the NDVI, Normalized
Difference Vegetation Index) and a capacitance probe
(GrassMaster II which estimates plant mass). The results showed the potential of NDVI for monitoring the evolution of spatial and temporal patterns of vegetative growth of biodiverse pasture. Higher NDVI values were registered as pasture approached its greatest vegetative vigor, with a significant fall in the measured NDVI at the end of Spring, when the pasture began to dry due to the combination of higher temperatures and
lower soil moisture content. This index was also effective for identifying different plant species (grasses/legumes)
and variability in pasture yield. Furthermore, it was possible to develop calibration equations between the capacitance and the NDVI (R2 = 0.757; p < 0.01), between capacitance and GM (R2 = 0.799; p<0.01), between capacitance and DM (R2 = 0.630; p<0.01), between NDVI and GM (R2=0.745; p < 0.01), and between
capacitance and DM (R2=0.524; p<0.01). Finally, a direct relationship was obtained between NDVI and pasture moisture content (PMC, in %) and between
capacitance and PMC (respectively, R2 = 0.615; p<0.01 and R2=0.561; p <0.01) in Alentejo dryland farming systems. |
URI: | http://hdl.handle.net/10174/19605 |
Type: | article |
Appears in Collections: | ERU - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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