Spectral estimates of absorbed radiation and phytomass production in corn and soybean canopies

Daughtry, Craig S. T.; Gallo, Kevin P.; Goward, Samuel N.; Prince, S. D.; Kustas, William P.

doi:10.1016/0034-4257(92)90132-4

Cited by 240 publications

(120 citation statements)

References 24 publications

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“…The values measured here for maize are similar to the higher values in the literature (e.g. Kiniry et al, 1989;Daughtry et al, 1992;Tollenaar & Aguilera, 1992;Andrade et al, 1993). The values for pea are similar to the 1.46 g MJ intercepted PAR reported by Heath & Hebblethwaite (1985).…”

Section: Discussionsupporting

confidence: 90%

Radiation Capture and Use as Affected by Morphologically Contrasting Maize/Pea in Sole and Intercropping

Kanton¹,

Dennett²

2008

West African Journal of Applied Ecology

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Field experiments were conducted at the Field Unit of the School of Plant Sciences in Reading, UK, during the 2000 and 2001 growing seasons to compare the radiation capture and use efficiency of morphologically and physiologically contrasting maize/pea intercrops with sole crops. The maize cultivars comprised Nancis with erect and Sophy with floppy leaves whilst the peas consisted of Maro, a conventional leaved, and Princess, a semi-leafless cultivar. Radiation capture by the sole and intercrops was measured using a Sunflek Ceptometer (Delta T Devices), with a sensor length of 80 cm. Measurements were taken at four equidistant positions in each plot, 1 m away from the edges of the plot. Before the maize grew above the peas, measurements were taken at the top of the canopy and below. When the canopies were distinct, three measurements were taken, above the canopy, above peas and below the canopy from 9.30 a.m. to 1.00 p.m. at weekly intervals. In both seasons the intercrops and sole pea crops intercepted more radiation compared to the sole maize crops. Towards the end of the season the intercrops and sole maize had similar interception. Intercropping both maize cultivars in 2000 with the conventional pea had the greatest interception in 2001. Radiation use efficiency (RUE) was measured by taking the respective changes in above ground dry weight and dividing by the respective changes in cumulative absorbed photosynthetic active radiation (PAR). The RUE were highest at mid-season for both intercrops and sole crops in both seasons. Comparisons were also made using cumulative radiation use efficiencies (CRUE), representing the RUE from emergence to any time. Sole pea had the lowest CRUE in both seasons. The sole maize in 2000 had highest CRUE. However, in 2001 intercrops had similar CRUE to sole maize, suggesting an increase in RUE of peas in intercrops. Nancis had consistently higher CRUE in both seasons compared to Sophy. The results emphasize that radiation capture and use efficiency in sole and intercrops are greatly affected by morphological characteristics of the component crops. In choosing cropping partners for intercropping special attention should be given to selecting cereal crops with erect leaves as against those with droopy leaves. The under-storey legume crop should also have erect or semi erect leaves so as to capture radiation filtering through the cereal canopy in order to maximize the capture and use of photosynthetically active radiation for increased and stable yields.

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Section: Discussionsupporting

confidence: 90%

Radiation Capture and Use as Affected by Morphologically Contrasting Maize/Pea in Sole and Intercropping

Kanton¹,

Dennett²

2008

West African Journal of Applied Ecology

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“…Additional studies have shown that various spectral vegetation indices, calculated from visible and near-infrared (NIR) reflectance data, are linearly related to canopy light interception [16][17][18][19][20][21][22]. Additional research in SJV shows a strong relationship between Landsat normalized difference vegetation index (NDVI) and Fc for multiple horticultural crops [23].…”

Section: Introductionmentioning

confidence: 99%

Satellite NDVI Assisted Monitoring of Vegetable Crop Evapotranspiration in California’s San Joaquin Valley

2012

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Abstract:Reflective bands of Landsat-5 Thematic Mapper satellite imagery were used to facilitate the estimation of basal crop evapotranspiration (ETcb), or potential crop water use, in San Joaquin Valley fields during 2008. A ground-based digital camera measured green fractional cover (Fc) of 49 commercial fields planted to 18 different crop types (row crops, grains, orchard, vineyard) of varying maturity over 11 Landsat overpass dates. Landsat L1T terrain-corrected images were transformed to surface reflectance and converted to normalized difference vegetation index (NDVI). A strong linear relationship between NDVI and Fc was observed (r 2 = 0.96, RMSE = 0.062). The resulting regression equation was used to estimate Fc for crop cycles of broccoli, bellpepper, head lettuce, and garlic on nominal 7-9 day intervals for several study fields. Prior relationships developed by weighing lysimeter were used to transform Fc to fraction of reference evapotranspiration, also known as basal crop coefficient (Kcb). Measurements of grass reference evapotranspiration from the California Irrigation Management Information System were then used to calculate ETcb for each overpass date. Temporal profiles of Fc, Kcb, and ETcb were thus developed for the study fields, along with estimates of seasonal water use. Daily ETcb retrieval uncertainty resulting from error in satellite-based Fc estimation was <0.5 mm/d, with seasonal uncertainty of 6-10%. Results were compared with FAO-56 irrigation guidelines and prior lysimeter observations for reference. OPEN ACCESSRemote Sens. 2012, 4 440

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“…FPAR(LAI) may be calculated from vegetation indices on the basis of the linear relationship existing between vegetation indices and the FPAR of green canopies (Daughtry et al, 1992), and particularly between NDVI and FPAR (Bastiaansen & Ali, 2003). Radiation use efficiency ( ) is assumed to be constant during the crop growing season (Casanova et al, 1998).…”

Section: Traditional and New Spectral Reflectance Indices For Biomassmentioning

confidence: 99%

Field Measurements of Canopy Spectra for Biomass Assessment of Small-Grain Cereals

Royo¹,

Villegas²

2011

Biomass - Detection, Production and Usage

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Spectral estimates of absorbed radiation and phytomass production in corn and soybean canopies

Cited by 240 publications

References 24 publications

Radiation Capture and Use as Affected by Morphologically Contrasting Maize/Pea in Sole and Intercropping

Radiation Capture and Use as Affected by Morphologically Contrasting Maize/Pea in Sole and Intercropping

Satellite NDVI Assisted Monitoring of Vegetable Crop Evapotranspiration in California’s San Joaquin Valley

Field Measurements of Canopy Spectra for Biomass Assessment of Small-Grain Cereals

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