Abstract
Nitrogen nutrition index (NNI) can monitor winter wheat nitrogen status precisely. Current studies by remote sensing data are to construct the above-ground biomass (AGB) and plant nitrogen concentration (PNC) with spectral indices, respectively, and then substitute them into established NNI equation. This leads to an accumulation of unavoidable error. Therefore, the objective in the study was to construct a direct NNI equation with remote sensing data to reduce this error. Field measurements data including AGB, PNC and canopy hyperspectral at different winter wheat growth stages during 2012/2013, 2013/2014, 2014/2015, 2015/2016 growing seasons in Beijing, China were collected. This study was endeavored to establish a vegetation index critical N dilution curve (Nvic) with two different spectral indices, RTVI (Red edge Triangular Vegetation Index) and NDVI/PPR (the ratio of the normalized difference vegetation index to the plant pigment ratio), which are sensitive to AGB and PNC, respectively. The vegetation index NNI (NNIvi) was calculated from the ratio between the NDVI/PPR and Nvic. Results showed that (1) Nvic can be described by an equation, Nvic = 1106.4(VIRTVI)−1.512, where RTVI ranged from 2.39 to 22.14; the determination coefficient (R2) was 0.57; (2) The NNI based on the above Nvic dilution curve was in good accordance with the classical NNI, with the root mean square error (RMSE), normalized RMSE (nRMSE) and normalized average error (NAE) of 0.194, 22%, and 11%, respectively. The critical nitrogen dilution model constructed in this study was available for winter wheat nitrogen status monitoring. Thus, this study offers a new method which was suitable and convenient for estimating the NNI of the winter wheat and it can reduce quadric error for constructing NNI through indices directly instead of inversing AGB and PNC.
Highlights
Nitrogen (N) is an indispensable chemical element for plant growing and an acquired agricultural input to increase yield [1, 2]
We endeavored to establish a vegetation index critical N dilution curve (Nvic) with two different spectral indices Red-edge Triangular Vegetation Index (RTVI) [16] and ratio of the normalized difference vegetation index to the plant pigment ratio (NDVI/PPR) [17] which are sensitive to above-ground biomass (AGB) and plant nitrogen concentration (PNC), respectively
The AGB were significantly different under N0 to N2 applications, it indicated that N fertilizer had obviously influence on the crops growth
Summary
Nitrogen (N) is an indispensable chemical element for plant growing and an acquired agricultural input to increase yield [1, 2]. In the process of canopy growth in cereal crop, it needed a great deal of N [3]. Farmers applied more N fertilizer in fields than basic need during last few decades to ensure productivity [4]. Improving N use efficiency has become growing importance concerning economic costs and environmental problems [3, 24, 25]. Precise fertilization was proposed to reduce environmental problems caused by too much N fertilizer applied to the fields in modern agriculture [2]. Critical N concentration (Nc) means maximum growth could be achieved by applying the least but necessary nitrogen. Nitrogen nutrition index (NNI), as the ratio of plant nitrogen concentration (PNC) and corresponding Nc, is a suitable and reliable indicator of diagnosing of N in crops [7-9,23]. N nutrition was considered perfect when NNI equals one; if NNI was great than one, N nutrition was considered luxurious; and N nutrition was insufficient if NNI was less than one [8]
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