Estimating potato leaf area index for specific cultivars

Brown, D. M.; Dixon, Mike

doi:10.1007/bf02358007

Cited by 22 publications

(20 citation statements)

References 30 publications

(42 reference statements)

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“…LAD of potato varieties in the field is more than green house which is in agreement with the other reporters [10,15,16].…”

Section: Leaf Area Duration (Lad)supporting

confidence: 86%

Analysis of Genetical Diversity of Some of the Tetraploides Potato Cultivars Grown in Iran

Esfahai¹,

Pazoki²

2012

AJPS

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The genetical diversity of potato, Solanum tuberosum was assessed using morphological traits. To verify, how this diversity is distributed among the main potato varieties grown in Iran. A total of eleven potato varieties, Ramose, Sante, Shepody, Marfona, Maradona, Milova, Santana, Boren, Cosima, Granola and Agria, were evaluated under vivo and situ experimental conditions in Isfahan, conditions, Iran. Seven phenological, floral and morphological vegetative aerial descriptors, Growth Rate = CGR, Net Assimilation Rate = NAR, Leaf Area Duration = LAD, Leaf Area Ratio = LAR and specific Leaf Area = SLA were recorded. The descriptors were evaluated by SAS Software and their means comparison by DMRT test. Certain defined groups were observed, indicating that the diversity of the cultivars are structured with a considerable morphological variation in between the varieties with a very high significant growth indices.

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“…LAD of potato varieties in the field is more than green house which is in agreement with the other reporters [10,15,16].…”

Section: Leaf Area Duration (Lad)supporting

confidence: 86%

Analysis of Genetical Diversity of Some of the Tetraploides Potato Cultivars Grown in Iran

Esfahai¹,

Pazoki²

2012

AJPS

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“…in eastern Canada. With a simple model for simulating potato growth in Nova Scotia (Canada), Gordon et al (1997) reported RMSE values varying from 0.19 to 0.46 m 2 leaf m -2 soil for LAI, values that are only slightly lower than those obtained in our study (Table 6).…”

Section: Model Performance Evaluationcontrasting

confidence: 82%

Simulating Potato Growth and Nitrogen Uptake in Eastern Canada with the STICS Model

et al. 2016

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The ability of process‐based soil–crop models to simulate potato (Solanum tuberosum L.) yield and N uptake for a range of N fertilization under the conditions of eastern Canada has never been tested. Our objectives were (i) to calibrate and evaluate the performance of the STICS model for the Shepody and Russet Burbank cultivars with cultivar‐specific critical N concentration dilution curves, and (ii) to quantify the gain in model performance with cultivar‐specific N concentration curves rather than a generic curve. Data sets including measurements of leaf area index (LAI), total and tuber biomass, and total and tuber N uptake for several N rates (0–280 kg N ha−1) collected at Charlottetown, PE; Fredericton, NB; and Québec, QC, Canada were used. Calibration was done with one data set from Charlottetown for Shepody and one data set from Québec for Russet Burbank, while all the other data sets were used to evaluate model performance. Following calibration, the STICS model generally performed well, with a normalized root mean square error (NRMSE) < 30% and a normalized mean error (NME) ranging from –8% to 23%, for LAI and biomass. Model performance was slightly worse for total and tuber N uptake, although cultivar‐specific N concentration curves for Shepody and Russet Burbank improved model performance compared with a generic curve with a lower NRMSE (18–50% vs. 21–63%) and NME (–9 to 23% vs. –14 to 23%). Cultivar‐specific critical N concentration curves should therefore be used for assessing the N budget of potato cropping systems.Core Ideas The STICS soil–crop model was calibrated and evaluated for two potato cultivars. Calibrated and evaluated variables were LAI, total and tuber biomass, and total and tuber N uptake. Cultivar‐specific critical N concentration curves are recommended for N budget assessment.

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“…Por su parte, el coeficiente de extinción lumínica (k) se asumió invariable durante el ciclo para una distribución foliar esférica. Este aspecto debería ser revisado de manera particular, por cuanto en papa fue sugerida su variación sistemática durante el ciclo respecto al desarrollo del área foliar (Gordon et al, 1997), al igual que bajo la influencia de la densidad de siembra o la distancia entre filas de plantas, como también se ha observado en distintos cultivos anuales (Rosenthal et al, 1993;Flénet et al, 1996).…”

Section: Resultados Y Discusiónunclassified

“…Las curvas de IAF presentan un crecimiento de tres fases, similar al propuesto por Gordon et al (1997) en su modelo de desarrollo de la canopia para variedades específicas de papa. Asimismo, una vez alcanzado el valor de IAF máximo, la tendencia es que posteriormente no existan diferencias importantes entre el IAF de ambas densidades de siembra, de manera similar a lo reportado por Allen y Scott (1980) en la etapa final del ciclo.…”

Section: Resultados Y Discusiónunclassified

“…Reconociendo el papel fundamental del IAF en diversos procesos del crecimiento vegetal, Gordon et al (1997) evaluaron un modelo que estima la evolución del IAF basado en los principios de intercepción lumínica y la eficiencia de conversión en biomasa, y le incorporaron la influencia del estrés hídrico y las condiciones tér-micas para variedades específicas. El IAF, de esta manera, cumple la función de retroalimentación entre las plantas y el régimen de radiación, que de esta forma actúa controlando la capacidad fotosintética del cultivo (Kadaja y Tooming, 2004).…”

Section: Introductionunclassified

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Uso del Índice de Área Foliar y del Porcentaje de Cobertura del Suelo Para Estimar la Radiación Interceptada en Papa

Casa¹,

Ovando²,

Bressanini³

et al. 2007

Agric. Téc.

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A B S T R A C TSince there is no information in the green belt of Córdoba, Argentine, about the use of instruments to measure leaf area index (IAF) through light interception in potato crop (Solanum tuberosum L.), a study was developed with the objectives of: i) evaluating the employment and capacity of an optic instrument to determine IAF in a potato crop; ii) verifying IAF and ground cover (%C) using alternative measurements of crop canopy development to estimate intercepted radiation (fAPAR). The measurements were carried out during 2005 (from February 4 to June 1), in a plantation density experiment near Córdoba (31 0 30' S lat, 64 0 08' W long, 402 m.a.s.l.), with three treatments, in pl m -2 : 6.0 ± 0.6 (TDC); 3.9 ± 0.2 (TDB) and 7.9 ± 0.7 (TDA). IAF was estimated by means of an optic instrument (ceptometer) and ground cover (%C) through digital pictures. The IAF values measured with the ceptometer were compared with photogrametric determinations obtaining an acceptable correlation (R 2 = 0.80; P < 0.01). The relationship between IAF and fAPAR remained uniform, in the sense of comparing plantation densities, likewise during different moments of the cycle. Until the crop reaches maximum covering, the relationship between %C and fAPAR was linear, with a highly significant (R 2 = 0.93; P < 0.01) coefficient of adjustment, although it shifts slightly away from a 1:1 relationship. R E S U M E NDebido a que no existen antecedentes en el cinturón verde de Córdoba, Argentina, del uso de aparatos para medir el índice de área foliar (IAF) a través de la intercepción lumínica en el cultivo de papa (Solanum tuberosum L.), se desarrolló un trabajo con estos objetivos: i) evaluar el empleo y capacidad de un instrumento óptico para determinar el IAF; ii) verificar la utilización del IAF y de la cobertura del suelo como mediciones alternativas del desarrollo de la parte aé-rea del cultivo, a fin de estimar la fracción de radiación interceptada (fAPAR). Las mediciones se realizaron durante la campaña de papa semitardía del año 2005 (del 4 de febrero al 1 de junio), en un ensayo de densidad de plantación ubicado próximo a la ciudad de Córdoba (31°30' lat. Sur, 64°08' long. Oeste, 402 m.s.n.m.), que consistió de tres tratamientos, en pl m -2 : 6,0 ± 0,6 (TDC); 3,9 ± 0,2 (TDB) y 7,9 ± 0,7 (TDA). El IAF se midió por medio de un interceptómetro óp-tico y el porcentaje de cobertura del suelo (%C) a partir de fotografías digitales. Los valores de IAF calculados con las mediciones del interceptómetro se contrastaron con determinaciones fotogramétricas, obteniendo una correlación aceptable (R 2 = 0,80; P < 0,01) entre ambos. La relación entre IAF y fAPAR se mantuvo uniforme, tanto en el sentido de comparar las densidades de plantación, como así también durante diferentes momentos del ciclo. Hasta que el cultivo alcanza cobertura máxima, la relación entre %C y fAPAR es lineal, con un coeficiente de ajuste altamente significativo (R 2 = 0,93; P < 0,01), si bien se aparta ligeramente de la relación 1:1.Palabras clave: papa, densidad ...

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Estimating potato leaf area index for specific cultivars

Cited by 22 publications

References 30 publications

Analysis of Genetical Diversity of Some of the Tetraploides Potato Cultivars Grown in Iran

Analysis of Genetical Diversity of Some of the Tetraploides Potato Cultivars Grown in Iran

Simulating Potato Growth and Nitrogen Uptake in Eastern Canada with the STICS Model

Uso del Índice de Área Foliar y del Porcentaje de Cobertura del Suelo Para Estimar la Radiación Interceptada en Papa

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