The Relationship of Potato Leaf Temperatures to Air Temperatures as Affected by Overhead Irrigation, Soil Moisture and Weather

Lomas, J.; Schlesinger, E.; Zilka, M.; Israeli, A.

doi:10.2307/2402049

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…There can be large diurnal fluctuations in the relative water content of leaves caused by the inability of plants to absorb water at a rate sufficient to replace that lost by transpiration (Werner, 1954). These fluctuations are accompanied by higher leaf temperatures relative to air temperatures in periods of high evaporative demand and limited supplies of water (Lomas et al, 1972). When there are ample supplies of water the evaporative cooling caused by transpiration can maintain leaf temperatures close to ambient.…”

Section: Fig 4·3mentioning

confidence: 99%

The physiology of growth and tuber yield

Moorby¹

1978

The Potato Crop

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In the past decade there have been several books and reviews which have considered the physiology of potatoes (Ivins and Mil thorpe, 1963;Burton, 1966;Milthorpe and Moorby, 1967;Moorby and Milthorpe, 1975). The first two of these were concerned, in part, with trying to put the study of the potato crop on a firm fundamental basis. The second two reviews reported how this work was proceeding. It seems appropriate for the purposes of this book to describe the present state of our knowledge of potato physiology and, probably more important, to discuss how our attitudes and research priorities have changed and suggest areas where we appear to need further information.Discussions such as this have usually started with the dormant tuber and subsequent development of sprouts during storage. I believe that basic physiology of sprout growth is now well understood and I intend to devote more attention to non-storage growth. The first, and major part of the chapter will be concerned, therefore, with growth in the field and the development of the crop of tubers. Physiological aspects of storage will then be considered and sprout growth discussed in terms of its management for different purposes. Growth in the field Pre-emergence growthThe potato is different from most other major annual crops in that it is usually propagated vegetatively. The seed tuber bears a number of sprouts, some or all of which may be growing. It is these growing sprouts which produce the daughter plant and the subsequent crop and, unless P. M. Harris (ed.), The Potato Crop

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Section: Fig 4·3mentioning

confidence: 99%

The physiology of growth and tuber yield

Moorby¹

1978

The Potato Crop

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“…However, it should be borne in mind that above-canopy irrigation also wets the leaves of the crop canopy and thus modifies leaf temperatures to a much greater extent than our experimental data would suggest (Lomas et al, 1972). There is no significant difference once irrigation ceases between the two methods of water application.…”

Section: Effect Of Irrigation On Microclimatic Modificationmentioning

confidence: 60%

“…There is no significant difference once irrigation ceases between the two methods of water application. However, it should be borne in mind that above-canopy irrigation also wets the leaves of the crop canopy and thus modifies leaf temperatures to a much greater extent than our experimental data would suggest (Lomas et al, 1972). The effect of irrigation on the relative humidity and vapour pressure of the microclimate are also quite pronounced.…”

Section: Effect Of Irrigation On Microclimatic Modificationmentioning

confidence: 64%

“…The effect of sprinkler irrigation on the microclimate of potatoes (Lomas et al, 1972) and avocado plantations (Lomas & Mandel, 1973) will be briefly reviewed. The rate of temperature decrease and the rate of relative humidity increase will vary with climatic conditions and crop characteristics.…”

Section: Microclimate Of a Sprinkler-irrigated Cropmentioning

confidence: 99%

“…The duration of lcaf wetness induced by sprinkling irrigation, on its own or in combination with rainfall or dew formation, is a critical factor affecting the epidemiology of plant disease. The effect of sprinkler irrigation on the microclimate of potatoes (Lomas et al, 1972) and avocado plantations (Lomas & Mandel, 1973) will be briefly reviewed.…”

Section: Microclimate Of a Sprinkler-irrigated Cropmentioning

confidence: 99%

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Sprinkler irrigation and plant disease under semi‐arid climatic conditions¹

Lomas

1991

EPPO Bulletin

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The effect of overhead irrigation on plant disease can conveniently be discussed under the following headings. Spore dispersal: irrigation effects splash dispersal and provides the necessary moisture. Under semi‐arid conditions, spore dispersal takes place during the morning hours. Irrigation early in the day will aid spore dispersal. Spore resistance: irrigation will modify microclimatic conditions and reduce the stress of exposed spores to radiation, heat and dryness. Moisture period required for infection: leaf surface temperatures will determine the moisture period required for infection. Irrigation timing in relation to moisture provided by rainfall or dew may be critical. The macroclimate: the less favourable the macroclimate, the greater is the importance of microclimatic modifications, and its effect on epidemiology. Microclimatic modifications: the lower the relative humidity during the day and the shorter the period of leaf wetness (dew), the greater will be the impact of sprinkling. Foliar density interacts in determining the microclimate. The later the spore dispersal during the morning, the smaller will the effect of sprinkling be. The greater the resistance of the spores to stress conditions during the day, the smaller the effect of sprinkling. The shorter the period required for host penetration, the more pronounced will be the effect of overhead irrigation.

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