Dew over India and its contribution to winter-crop water balance

Raman, C. R. V.; Venkataraman, S.; Krishnamurthy, V.

doi:10.1016/0002-1571(73)90048-4

Cited by 22 publications

(17 citation statements)

References 3 publications

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“…In the central region of Israel (Degania), dew was registered on 50% of the nights observed, whereas on the coast the number of days with dew recorded was from 22 to 29 days per month from May to September (Duvdevani 1964). Raman et al (1973) reported estimates of dew occurrence of 80% and 10% of the year in some regions of India. Values of vertical and surface deposition of dew were similar to those reported by Lloyd (1961) in Idaho in summer, Fritschen and Doraiswamy (1973) in the north east of the United States, Raman et al (1973) in India, andSharma (1976) in the south east of Australia.…”

Section: Discussionmentioning

confidence: 99%

Dew and its effect on two heliophile understorey species of a tropical dry deciduous forest in Mexico

Barradas

Glez-Medellín

1999

International Journal of Biometeorology

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A series of horizontal and vertical measurements of dew deposition and dew duration were carried out in a tropical dry deciduous forest in western Mexico (19° 30′ N, 105° 03′ W). The effect of dew on transpiration in heliophile species was also investigated. The amount of dew was very variable with no temporal or spatial pattern. The amount of dew measured at two horizontal transects (maximum and minimum) (at heights of 0.20 m and 1.30 m above ground level) was from 0.014 to 0.203 mm and from 0.013 to 0.061 mm in the middle and at the end of the dry season, respectively. Dew deposition at different vertical levels (0.50-12.5 m height) ranged from 0.04 to 0.36 mm. The duration of dew formation ranged between 60 and 129 min after sunrise above the canopy (a height of 11 m), and between 259 and 290 min after sunrise at a height of 2 m. Daily transpiration rates were 883 and 632 g m -2 d -1 in Coccoloba liebmannii and 538 and 864 g m -2 d -1 in Jacquinia pungens in January and April, respectively. Transpiration was restricted from sunrise to early afternoon in April, as a result of the pronounced midday closure of stomata in both species. The reduction of transpiration by dew ranged from 13.2 to 50.1 g m -2 d -1 and from 4.5 to 77.7 g m -2 d -1 for C. liebmannii and J. pungens, respectively. Dew can play an important role in enhancing the survival of heliophile species in the dry season by reducing transpiration rates during the morning.& k w d : Key words Dew · Heliophile species · Mexico · Transpiration · Tropical dry deciduous forest& b d y :

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Section: Discussionmentioning

confidence: 99%

Dew and its effect on two heliophile understorey species of a tropical dry deciduous forest in Mexico

Barradas

Glez-Medellín

1999

International Journal of Biometeorology

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“…Similarly impressive are the Indian Summer Monsoon-dependent Anogeissus dhofarica (Combretaceae) forests in Dhofar region of southern Oman and Yemen (El-Sheikh, 2013;Hildebrandt and Eltahir, 2006;Kürschner et al, 2004). Dew may also play a role in maintaining plant water status through foliar uptake of moisture, which has been documented for several species in arid and humid environments (Goldsmith et al, 2013;, as well as in the reduction of transpiration rates in early morning hours (Ben-Asher et al, 2010;Raman et al, 1973;Richards, 2004). However, the significance of these mechanisms relative to water uptake in roots are controversial, especially for crop plants (Goldsmith et al, 2013).…”

Section: Introductionmentioning

confidence: 90%

“…However, the significance of these mechanisms relative to water uptake in roots are controversial, especially for crop plants (Goldsmith et al, 2013). The quantification of dew deposition amount and duration is of concern for plant disease management (Jacobs et al,1994;Pedro and Gillespie,1981;Raman et al,1973) and for estimating the potential of dew water harvesting Clus et al, 2008;Muselli et al, 2009;Sharan et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Dewfall and its ecological significance in semi-arid coastal south-western Madagascar

Hanisch

Lohrey

Buerkert

2015

Journal of Arid Environments

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“…Dew happens in natural surfaces, especially in plant canopies, where it can be originated from two different processes: the "dew precipitation", when the condensation of vapor is originated from the immediately superior layer, adjacent to the surface, and the "dew distillation", when the condensation of vapor is originated from the soil or another leaf, being both function of the vapor pressure gradient (BURRAGE, 1972;SHARMA, 1976). However, according to RAMAN et al (1973), the condensation in the inferior leaf face is, usually, insignificant when compared with the process that promotes the condensation in the superior face of the leaves. BURRAGE (1972) and VAN DER WAL (1978) pointed out that the period during water (dew and/or rain) is present on the plants, named leaf wetness duration (LWD), is much more important than the total water amount stored by the leaves, especially regarding diseases development.…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of leaf wetness duration in a 'Niagara Rosada' vineyard

Lulu¹,

Sentelhas²,

Júnior³

et al. 2008

Eng. Agríc.

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Despite considerable efforts to develop accurate electronic sensors to measure leaf wetness duration (LWD), little attention has been given to studies about how is LWD variability in different positions of the crop canopy. In order to evaluate the influence of 'Niagara Rosada' (Vitis labrusca) grapevine structure on the spatial variability of LWD, the objective of this study was to determine the canopy position of the 'Niagara Rosada' table grape with longer LWD and its correlation with measured standard LWD over turfgrass. LWD was measured in four different canopy positions of the vineyard (sensors deployed at 45º with the horizontal): at the top of the plants, with sensors facing southwest and northeast (Top-SW and Top-NE), and at the grape bunches height, with sensors facing southwest and northeast (Bottom-SW and Bottom-NE). No significant difference was observed between the top (1.6 m) and the bottom (1.0 m) of the canopy and also between the southwest and northeast face of the plants. The relationship between standard LWD over turfgrass and crop LWD in different positions of the grape canopy showed a define correlation, with R 2 ranging from 0.86 to 0.89 for all period, from 0.72 to 0.77 for days without rain, and from 0.89 to 0.91 for days with rain.KEYWORDS: dew, rain, flat plate wetness sensor. VARIABILIDADE ESPACIAL DA DURAÇÃO DO PERÍODO DE MOLHAMENTO EM VINHEDO DE 'NIAGARA ROSADA'RESUMO: Apesar dos esforços consideráveis para se desenvolverem sensores eletrônicos acurados para medir a duração do período de molhamento (DPM), pouca atenção tem sido dada às pesquisas sobre a variabilidade da DPM no interior do dossel das culturas. A fim de avaliar a influência da estrutura da cobertura vegetal da videira 'Niagara Rosada' (Vitis labrusca) na variabilidade espacial da DPM, o objetivo do presente estudo foi determinar a posição da videira com a maior DPM e sua relação com a DPM medida em condição-padrão (no gramado). Para tanto, a DPM foi medida em quatro diferentes posições da planta, com os sensores inclinados em 45º em relação à horizontal: topo da planta com a face superior do sensor voltada para sudoeste e nordeste (Topo-SW e Topo-NE) e altura dos cachos de uva com a face superior do sensor voltada para sudoeste e nordeste (Dossel-SW e Dossel-NE). Não houve diferença significativa da DPM tanto entre a parte mais alta (1,6 m) e a parte mais baixa (1,0 m) da planta, como entre as faces sudoeste e nordeste das plantas. As relações entre os dados de DPM sobre o gramado e nas diversas posições da cobertura vegetal, obtidas por meio de regressão linear simples, apresentaram correlações bem definidas, com valores de R 2 variando de 0,86 a 0,89 para todo o período, de 0,72 a 0,77 para os dias sem chuva e de 0,89 a 0,91 para os dias com chuva. PALAVRAS-CHAVE:orvalho, chuva, sensor de molhamento de placa plana.

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Dew over India and its contribution to winter-crop water balance

Cited by 22 publications

References 3 publications

Dew and its effect on two heliophile understorey species of a tropical dry deciduous forest in Mexico

Dew and its effect on two heliophile understorey species of a tropical dry deciduous forest in Mexico

Dewfall and its ecological significance in semi-arid coastal south-western Madagascar

Spatial variability of leaf wetness duration in a 'Niagara Rosada' vineyard

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