Transmittance and Reflectance Measurements of CornLeaves from Plants with Different Nitrogen and Water Supply

Schepers, James S.; Blackmer, T. M.; Wilhelm, Wallace; Resende, M. D. V. de

doi:10.1016/s0176-1617(96)80071-x

Cited by 196 publications

(103 citation statements)

References 19 publications

(5 reference statements)

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“…In the near-infrared wave band (800-1100 nm), the spectral properties of leaves were mainly influenced by the tissue structure in leaves, while the impact of chlorophyll could be negligible. The spectral transmittance of leaf in the near-infrared wave band was 40-50%, which is in line with the results of plant leaf spectrum by other researchers referring to that the absorptivity of leaf was generally less than 10% and reflectivity was about 50% [18][19].…”

Section: The Spectral Transmission Of Plant Leavessupporting

confidence: 91%

Study on Plant Nutrition Indicator Using Leaf Spectral Transmittance for Nitrogen Detection

Yang³

2011

Computer and Computing Technologies in Agriculture IV

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Abstract. The low fertilizer utilization at growing season and environment pollution coursed by unreasonable fertilization are becoming global outstanding problems in agricultural production. Scientific and reasonable fertilization based on rapid and nondestructive plant nutrient detection will be a valuable solution for solving above problems. In this study, spectral transmittance in wavelength ranged from 300 to 1100 nm, chlorophyll content and nitrogen content of rice and cucumber leaves treated with culture solution in five different nitrogen levels were measured. According to the correlation analysis between them, 560, 650, and 720 nm as feature wavelengths and 940 nm as reference wavelength were determined for nitrogen detection. Correlation analysis between 21 spectral feature parameters composed by the transmittance at above wavelength, the leaf chlorophyll content and nitrogen content, and combined with their regression examination indicated that spectral feature parameters of (T940 -T560) / (T940 + T560), log (T940/T560) and log (T940/T650) are useful to conduct plant nutrient diagnosis with less than 8% relative error in rice and cucumber leaves. Therefore, the above spectral feature parameters as plant nitrogen indicators can be used to estimate the chlorophyll content and nitrogen content, furthermore support for non-destructive plant nutrient detection and fertilizer recommendation based on testing soil.

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Section: The Spectral Transmission Of Plant Leavessupporting

confidence: 91%

Study on Plant Nutrition Indicator Using Leaf Spectral Transmittance for Nitrogen Detection

Yang³

2011

Computer and Computing Technologies in Agriculture IV

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“…The curvilinear response of the SPAD values to canola N concentration may be attributed to: -increase in the proportion of nitrate-N in the total N form at high N levels, which is included in assays of total N, whereas, it is not detected by the chlorophyll meter (Dwyer et al, 1995), and -the effect of drought stress which partially increases the leaf vacuolar pigments affecting the SPAD values (Schepers et al, 1996).…”

Section: And Discussionmentioning

confidence: 99%

Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture

Meskini-Vishkaee¹,

Mohammadi²,

Neyshabouri³

et al. 2015

International Agrophysics

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A b s t r a c t. The paper presents a study on the effect of soil matric suction on the variation of leaf chlorophyll index and nitrogen concentration of canola. Results showed that chlorophyll index increases exponentially with soil matric suction, especially at the late season of canola growing time. At moderate matric suction (200 and 300 kPa soil suction heads), chlorophyll index remains nearly constant, but in drier soil (matric suction >300 kPa), chlorophyll index increases gradually with time. Despite the variation of the total leaf nitrogen with the soil matric suction, it is similar to the variation of the chlorophyll index, but the results showed that the chlorophyll index -nitrogen concentration curve has a demarcated bi-modal shape. We suggest that 2.7% of nitrogen and 69.8 of the chlorophyll index value represent the upper limit of the chlorophyll meter reliability for estimation of canola nitrogen under a wide range of soil moisture levels. These results confirm that the chlorophyll meter can be used as an effective tool for rapid and non-destructive estimation of the relative chlorophyll and nitrogen content in canola leaves at a wide range of soil moisture content, except for nearly wilting coefficient or extremely high drought stress.

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“…Leaves of the same age and position on the plant were used; young leaves with non-uniform color were left aside. Chlorophyll meter readings not only respond to crop nitrogen status, but can also be affected by availability of other nutrients (Schepers et al 1996). N-Tester readings were measured in the beginning of August 2001August , 2002August and 2003.…”

Section: N-tester Measurements and Leaf Nutrient Contentmentioning

confidence: 99%

Effect of NPK fertilization and elemental sulphur on growth and yield of lowbush blueberry

Starast

Karp²,

Vool³

2008

AFSci

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The aim of the research was to determine the effect of fertilizers on the pH of former arable soils and on the growth and the yield of the lowbush blueberry (Vaccinium angustifolium Ait.). Lowbush blueberry fertilization experiments were established in 1999 at two locations at Kärla, Saaremaa, West Estonia and at Vasula, Tartu County, South Estonia. Experimental sites were situated on different soils: soil pHKCl at Kärla was 5.5 and at Vasula 6.2. Elemental sulphur and acidifying fertilizers (ammonium sulfate, potassium sulfate and superphosphate) were used in both plantations. Fertilizers were applied based on nutrient in the soil and sulphur was applied at 100 g m2. Plant growth was recorded in 2001, 2002 and 2003. A positive influence of NPK fertilization on yield was found in both Kärla and Vasula, and yield were 336 g and 41 g higher compared to the control, respectively. The vegetative growth and yield of blueberry depended significantly on soil pH. Elemental sulphur increased soil acidity and on loamy sand soil did not increase plant productivity. The sulphur effect on soil pH began to decrease three years after application. Sulphur can be recommended to increase soil acidity in nutrient-rich soil but, not nutrient poor soil with light texture, where only NPK fertilizers were effective.;

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Transmittance and Reflectance Measurements of CornLeaves from Plants with Different Nitrogen and Water Supply

Cited by 196 publications

References 19 publications

Study on Plant Nutrition Indicator Using Leaf Spectral Transmittance for Nitrogen Detection

Study on Plant Nutrition Indicator Using Leaf Spectral Transmittance for Nitrogen Detection

Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture

Effect of NPK fertilization and elemental sulphur on growth and yield of lowbush blueberry

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