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12 May 2014 Use of proximal sensors to evaluate at the sub-paddock scale a pasture growth-rate model based on light-use efficiency
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Abstract

Monitoring pasture growth rate is an important component of managing grazing livestock production systems. In this study, we demonstrate that a pasture growth rate (PGR) model, initially designed for NOAA AVHRR normalised difference vegetation index (NDVI) and since adapted to MODIS NDVI, can provide PGR at spatial resolution of ∼2 m with an accuracy of ∼2 kg DM/ha.day when incorporating in-situ sensor data. A PGR model based on light-use efficiency (LUE) was combined with in-situ measurements from proximal weather (temperature), plant (fraction of absorbed photosynthetically active radiation, fAPAR) and soil (relative moisture) sensors to calculate the growth rate of a tall fescue pasture. Based on an initial estimate of LUEmax for the candidate pasture, followed by a process of iterating LUEmax to reduce prediction errors, the model was capable of estimating PGR with a root mean square error of 1.68 kg/ha.day (R2 = 0.96, P-value ≈ 0). The iterative process proved to be a convenient means of estimating LUE of this pasture (1.59 g DM/MJ APAR) under local conditions. The application of the LUE-PGR approach to developing an in-situ pasture growth rate monitoring system is discussed.

© CSIRO 2014
M. M. Rahman, D. W. Lamb, J. N. Stanley, and M. G. Trotter "Use of proximal sensors to evaluate at the sub-paddock scale a pasture growth-rate model based on light-use efficiency," Crop and Pasture Science 65(4), 400-409, (12 May 2014). https://doi.org/10.1071/CP14071
Received: 26 February 2014; Accepted: 1 April 2014; Published: 12 May 2014
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