Studies on spectral reflectance under normal and nitrogen, phosphorus and pest and disease stress condition in soybean (Glycine max L.)

Patil, V. D.; Adsul, P. B.; Deshmukh, L. S.

doi:10.1007/bf02990790

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…This was because of nitrogen which plays an important role in chlorophyll synthisis and red radiance is more sensitive to chlorophyll pigment because chlorophyll bands are in centre of blue and red region. These observations were in conformity with the findings of Patil et al, (2007) and Gole et al (2008).…”

Section: Results and Discussion Spectral Indicessupporting

confidence: 93%

“…No significant relation between zinc, copper and manganese concentration with RVI was noticed. Findings made by Patil et al, (2007) were in concurrence with present observations. They reported that RVI showed nearly 44 per cent contribution to the studied growth parameters and plant nutrients.…”

Section: Results and Discussion Spectral Indicessupporting

confidence: 92%

“…In a nutrient deficient crop, because of the low chlorophyll content, the red reflectance would be much higher compared to that in the infra red region. Patil et al, (2007) reported that these derived spectral indices were in agreement with the important biophysical parameters of the plant like leaf area, leaf area index, leaf area duration, chlorophyll content, dry matter production and these attributes were positively correlated with ultimate economic part of crop production. Similar variation was observed for the NDVI and RVI and also for the SPAD reading.…”

Section: Results and Discussion Spectral Indicesmentioning

confidence: 60%

“…And it is reverse in case of the plant which is under stressed situation (Patil et al, 2007 andGole et al, 2008). Further, nutrient deficient groundnut crop had lower NDVI and RVI values compared to nutrient sufficient groundnut samples.…”

Section: Results and Discussion Spectral Indicesmentioning

confidence: 99%

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Groundnut spectral indices and characterization in relation to crop nutrient status

Patel

Manjunatha

2017

IJARe

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The spectral indices such as NDVI and RVI were calculated by using spectral signatures obtained through spectro-photosensor. The mean NDVI and RVI values were 0.71 and 6.46, respectively. Wide variation in the NDVI and RVI values were observed across the farmers' fields revealing that crop was exposed to varied levels of nutrient deficiency. The SPAD (Indicator of chlorophyll activity) readings ranged between 25.8 and 46.8. The SPAD and the index leaf N, P, K, Ca and Fe content had positive and strong relation with both NDVI and RVI. However, NDVI registered stronger relation than RVI. Co-efficient of determination (R 2 ) value of the multiple regressions between NDVI and index leaf nutrient content was 0.52. The mean N, P, K, Ca and S content in the index leaf were 3.9, 0.43, 3.45, 1.77 and 0.43 per cent, respectively. Similarly, Zn, Fe, Mn and Cu content in the crop index leaf tissue were 21.9, 40.6, 53.2 and 19.3 mg kg -1 .

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Section: Results and Discussion Spectral Indicessupporting

confidence: 93%

Section: Results and Discussion Spectral Indicessupporting

confidence: 92%

Section: Results and Discussion Spectral Indicesmentioning

confidence: 60%

Section: Results and Discussion Spectral Indicesmentioning

confidence: 99%

See 2 more Smart Citations

Groundnut spectral indices and characterization in relation to crop nutrient status

Patel

Manjunatha

2017

IJARe

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“…In agriculture, a high correlation has been found between the reflectance and leaf Chl level in crops such as corn ( Zea mays L.), soybean [ Glycine max (L.) Merr. ], potato ( Solanum tuberosum L.), rice ( Oryza sativa L.), and wheat ( Triticum aestivum L.) (Alchanatis and Schmilovitch, 2005; Patil et al, 2007; Goffart et al, 2008; Bajwa et al, 2010; Huang et al, 2011; Shao et al, 2012; Yao et al, 2013), and some reflectance indexes have been developed to estimate the plant response to the addition of N fertilizer (Richardson et al, 2002; Sims and Gamon, 2002; Bell et al, 2004; Garrity et al, 2011).…”

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confidence: 99%

Optimum Nitrogen Fertilization for Phyllostachys edulis Productivity and Photosynthetic Response

et al. 2016

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Nitrogen fertilizer is supplied for high production of Phyllostachys edulis (Carrière) J. Houz. shoots and culms. The objects of this study were to determine the optimum fertilizer amount, determine the effects of N fertilization on the promotion of photosynthesis, and provide help for remote sensing of fertilization effects. The shoot and culm production was significantly increased with 100, 250, and 400 kg N ha−1, and the two latter fertilization levels showed the best promoting effects without significant difference between them. Under N fertilization, the photosynthetic pigment content was increased, which led to a decline in the reflectance spectra. Nitrogen fertilization promoted quantum production and electron transport in photosystem II and inhibited the dissipation of absorbed light energy. The absorbed light energy can be emitted as fluorescence, which showed two main peaks in the red (685 nm) and far‐red (735 nm) regions. The width and area of the fluorescence peak at 735 nm declined, suggesting that N fertilization promoted the transduction of absorbed light energy in photosystem I. A remarkable reduction in intercellular CO2 concentrations and the light compensation point and an increase in the light saturation point demonstrated that the CO2 assimilation ability was increased with N supplementation. Among the three fertilization levels, 250 kg N ha−1 had the best effect on photosynthesis. We concluded that 250 kg N ha−1 is more suitable for practical application. The reflectance indexes and reflectance intensity ratio F685/F735 were significantly changed with N fertilization, indicating that they have potential value for estimating fertilization effects on bamboo production.

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Physiological assessment of water deficit in soybean using midday leaf water potential and spectral features

Wijewardana

Alsajri

Irby

et al. 2019

Journal of Plant Interactions

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Drought is one of the major abiotic stresses that limit soybean production worldwide. This study was conducted to determine whether soybean cultivars with divergent growth habits respond differently to drought stress at the vegetative growth stage regarding canopy reflectance, physiological, and gas exchange traits under controlled conditions. Soil moisture content was positively correlated with midday leaf water potential. Pooled over cultivar, photosynthesis and stomatal conductance were highly correlated with midday leaf water potential, while Ci/Ca exhibited a weak positive correlation. These data indicate that, regardless of cultivar, the decrease in net photosynthesis is mainly due to stomatal closure. For both cultivars, drought stress increased soybean canopy reflectance in the visible range of the spectrum but decreased reflectance in the near-infrared region. The quantified physiological traits would be useful to understand plant water relations and canopy structure to help soybean growers to make field management decisions during the growing season.

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Studies on spectral reflectance under normal and nitrogen, phosphorus and pest and disease stress condition in soybean (Glycine max L.)

Cited by 4 publications

References 6 publications

Groundnut spectral indices and characterization in relation to crop nutrient status

Groundnut spectral indices and characterization in relation to crop nutrient status

Optimum Nitrogen Fertilization for Phyllostachys edulis Productivity and Photosynthetic Response

Physiological assessment of water deficit in soybean using midday leaf water potential and spectral features

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