1- Babar M., Reynolds M., Van Ginkel M., Klatt A., Raun W., and Stone M. 2006. Spectral reflectance indices as a potential indirect selection criteria for wheat yield under irrigation. Crop Science 46(2): 578-588.
2- Bausch W.C., and Khosla R. 2010. Quick Bird satellite versus ground-based multi-spectral data for estimating nitrogen status of irrigated maize. Precision Agriculture 11(3): 274-290.
3- Blackmer T.M., Schepers J.S., Varvel G.E., and Walter-Shea E.A. 1996. Nitrogen deficiency detection using reflected shortwave radiation from irrigated corn canopies. Agronomy journal 88(1): 1-5.
4- Bonfil D.J., Karnieli A., Raz M., Mufradi I., Asido S., Egozi H., Hoffman A., and Schmilovitch Z. 2004. Decision support system for improving wheat grain quality in the Mediterranean area of Israel. Field Crops Research 89(1): 153-163.
5- Bouaziz M., Matschullat J., and Gloaguen R. 2011. Improved remote sensing detection of soil salinity from a semi-arid climate in Northeast Brazil. Comptes Rendus Geoscience 343(11): 795-803.
6- Carre F., and Girard M.C. 2002. Quantitative mapping of soil types based on regression kriging of taxonomic distances with landform and land cover attributes. Geoderma 110(3): 241-263.
7- Clevers J.G.P.W., and Gitelson A.A. 2013. Remote estimation of crop and grass chlorophyll and nitrogen content using red-edge bands on Sentinel-2 and -. 3. Int. J. Appl. Earth Obs. Geoinform 23: 344–351.
8- Darvishzadeh R., Skidmore A.K., Schlerf M., Atzberger C.G., and Cho M.A. 2008. LAI and Chlorophyll Estimation for a Heterogeneous Grassland Using Hyperspectral Measurements. ISPRS J. Photogramm 63: 409-426.
9- Daughtry C., Walthall C., Kim M., De Colstoun E.B., and McMurtrey Iii J. 2000. Estimating corn leaf chlorophyll concentration from leaf and canopy reflectance. Remote sensing of Environment 74(2): 229-239.
10- Gabriel K.R.: The biplot graphic display of matrices with application to principal component analysis, Biometrika, 58, 453–467, https://doi.org/10.2307/2334381, 1971.
11- Ghasemloo N., Mobasheri M., and Rezaei Y. 2011. Vegetation species determination using spectral characteristics and artificial neural network (SCANN). Journal of Agricultural Science and Technology 13: 1223-1232.
12- Gitelson A.A., Viña A., Arkebauer T.J., Rundquist D.C., Keydan G., and Leavitt B. 2003. Remote estimation of leaf area index and green leaf biomass in maize canopies. Geophysical Research Letters 30(5).
13- Haboudane D., Miller J.R., Tremblay N., Zarco-Tejada P.J., and Dextraze L. 2002. Integrated narrow-band vegetation indices for prediction of crop chlorophyll content for application to precision agriculture. Remote sensing of environment 81(2-3): 416-426.
14- Jia L., Yu Z., Li F., Gnyp M., Koppe W., Bareth G., Miao Y., Chen X., and Zhang F. 2011. Nitrogen status estimation of winter wheat by using an IKONOS satellite image in the north china plain, International Conference on Computer and Computing Technologies in Agriculture. Springer 174-184.
15- Lamb D., Steyn-Ross M., Schaare P., Hanna M., Silvester W., and Steyn-Ross A. 2002. Estimating leaf nitrogen concentration in ryegrass (Lolium spp.) pasture using the chlorophyll red-edge: theoretical modelling and experimental observations. International Journal of Remote Sensing 23(18): 3619-3648.
16- Land M.H., Guillermo M.A.S., Dos Santos W.R., Paioli-Pires E.J., Pommer C.V., and Botelho R.V. 2003. Nutritional evaluation of the condition of Italia grapevine in theregion of Jales, SP, using the diagnosis and recommendation integrated system. Rev Bras Frutic 25: 309-314.
17- LeeY.J.,Yang C.M., Chang K., and Shen Y. 2008. Asimplespectral index using reflectance of 735 nm to assess nitrogen status of rice canopy. Agronomy Journal 100: 205–212.
18- Lelong C.C., Pinet P.C., and Poilve H. 1998. Hyperspectral imaging and stress mapping in agriculture: a case study on wheat in Beauce (France). Remote Sensing of Environment 66: 179-191.
19- Merzlyak M., Gitelson A., Chivkunova O., Solovchenko A., and Pogosyan S. 2003. Application of reflectance spectroscopy for analysis of higher plant pigments. Russian Journal of Plant Physiology 50(5): 704-710.
20- Min M., Lee W.S., Burks T.F., Jordan J.D., Schumann A.W., Schueller J.K., and Xie H. 2008. Design of a hyperspectral nitrogen sensing system for orange leaves. Computers and Electronics in Agriculture 63(2): 215-226.
21- Mirzaee S., Ghorbani-Dashtaki S., Mohammadi J., Asadi H., and Asadzadeh F. 2016. Spatial variability of soil organic matter using remote Sensing Data. Catena 145: 118-127.
22- Mutanga O., Skidmore A., Kumar L., and Ferwerda J. 2005. Estimating tropical pasture quality at canopy level using band depth analysis with continuum removal in the visible domain. International Journal of Remote Sensing 26(6): 1093-1108.
23- Mutanga O., Skidmore A.K., and Prins H. 2004. Predicting in situ pasture quality in the Kruger National Park, South Africa, using continuum-removed absorption features. Remote sensing of Environment 89(3): 393-408.
24- Mutanga O., Skidmore A.K., and van Wieren S. 2003. Discriminating tropical grass (Cenchrus ciliaris) canopies grown under different nitrogen treatments using spectroradiometry. ISPRS Journal of Photogrammetry and Remote Sensing 57(4): 263-272.
25- Nagorny V.D. 2013. Soil and Plant Laboratory Analysis. (text book): 107-110.
26- Özyiğit Y., and Bilgen M. 2013. Use of spectral reflectance values for determining nitrogen, phosphorus, and potassium contents of rangeland plants. Journal of Agricultural Science and Technology 15: 1537-1545.
27- Perry E.M., and Davenport J.R. 2007. Spectral and spatial differences in response of vegetation indices to nitrogen treatments on apple. Computers and Electronics in Agriculture 59(1-2): 56-65.
28- Porder S., Asner G.P., and Vitousek P.M. 2005. Ground-based and remotely sensed nutrient availability across a tropical landscape. Proceedings of the National Academy of Sciences 102(31): 10909-10912.
29- Rahmati M., and Hamzehpour N. 2018. Effectiveness of spectral data reduction in detection of salt-affected soils in a small study area. Desert 23(1): 97-106.
30- Samson G., Tremblay N., Dudelzak A., Babichenko S., Dextraze L., and Wollring J. 2000. Nutrient stress of corn plants: early detection and discrimination using a compact multiwavelength fluorescent lidar, Proceedings of the 20th EARSeL Symposium, Dresden, Germany 214-223.
31- Shi J., Wang H., Xu J., Wu J., Liu X., Zhu H., and Yu C. 2007. Spatial distribution of heavy metals in soils: a case study of Changxing, China. Environmental Geology 52(1): 1-10
32- Smart D.R., Whiting M.L., and Stockert C. 2007. Remote sensing of grape K deficiency symptoms using leaf level hyperspectral reflectance, Western Nutrient Management Conference 19-24.
33- Starks P.J., Zhao D., Phillips W.A., and Coleman S.W. 2006. Development of canopy reflectance algorithms for real-time prediction of bermudagrass pasture biomass and nutritive values. Crop Science 46(2): 927-934.
34- Stroppiana, D., Boschetti, M., Brivio, P.A., and Bocchi, S., 2009. Plant nitrogen concentration in paddy rice from field canopy hyperspectral radiometry. Field crops research 111(1-2), 119-129.
35- Taiz L., and Zeiger E. 2010a. Plant Physiology. Sinauer Associates Inc.: Sunderland, MA, USA 5th ed.
36- Terra M.M., Guilherme M.A.S., Santos W.R.d., Paioli-Pires E.J., Pommer C.V., and Botelho R.V. 2003. Evaluation of the nutritional condition of Italia grapevine in the region of Jales, SP, using the diagnosis and recommendation integrated system. Revista Brasileira de Fruticultura 25(2): 309-314.
37- Thomas J.R., and Oerther G.F. 1972. Estimating nitrogen content of sweet pepper leaves by reflectance measurements. Agronomy Journal 64: 11–13.
38- Tian Y.C., Yao X., Yang J., Cao W.X., Hannaway D.B., and Zhu Y. 2011. Assessing newly developed and published vegetation indices for estimating rice leaf nitrogen concentration with ground- and space-based hyperspectral reflectance. Field Crops Research 120: 299-310.
39- Tilling A.K., O’Leary G.J., Ferwerda J.G., Jones S.D., Fitzgerald G.J., Rodriguez D., and Belford R. 2007. Remote sensing of nitrogen and water stress in wheat. Field Crops Research 104(1-3): 77-85.
40- Wei J.B., Xiao D.N., Zeng H., and Fu Y.K. 2008. Spatial variability of soil properties in relation to land use and topography in a typical small watershed of the black soil region, northeastern China. Environmental Geology 53(8): 1663-1672
41- Wilding L. 1985. Spatial variability: its documentation and implication to soil surveys, Soil spatial variability. Workshop 166-194.
42- Zadoks J.C., Chang T.T., and Konzak C.F. 1974. A decimal code for the growth stages of cereals. Weed Research 14(6): 415-421.
43- Zeng X., Dickinson R.E., Walker A., Shaikh M., DeFries R.S., and Qi J. 2000. Derivation and evaluation of global 1-km fractional vegetation cover data for land modeling. Journal of Applied Meteorology 39(6): 826-839.
44- Zhai Y., Cui L., Zhou X., Gao Y., Fei T., and Gao W. 2013. Estimation of nitrogen, phosphorus, and potassium contents in the leaves of different plants using laboratory-based visible and near-infrared reflectance spectroscopy: comparison of partial least-square regression and support vector machine regression methods. International Journal of Remote Sensing 34(7): 2502-2518.
45- Zhao D., Reddy K.R., Kakani V.G., and Reddy V. 2005. Nitrogen deficiency effects on plant growth, leaf photosynthesis, and hyperspectral reflectance properties of sorghum. European Journal of Agronomy 22(4): 391-403.
46- Zhu Y., Li Y.X., Zhou D.Q., Tian Y.C., Yao X., and Cao W.X. 2006. Quantitative relationship between leaf nitrogen concentration and canopy reflectance spectra in rice and wheat. Acta Ecol. Sin 26: 3463–3469.
47- Zhu Y., Yao X., Tian Y., Liu X., and Cao W. 2008. Analysis of common canopy vegetation indices for indicating leaf nitrogen accumulations in wheat and rice. International Journal of Applied Earth Observation and Geoinformation 10(1): 1-10.
48- Zvomuya F., Rosen C.J., Russelle M.P., and Gupta S.C. 2003. Nitrate leaching and nitrogen recovery following application of polyolefin-coated urea to potato. Journal of Environmental quality 32(2): 480-489.