Hack, H.R.B. (1978) Stomatal infiltration in irrigation experiments on cotton, grain sorghum, groundnuts, kenaf, sesame, and wheat. Annals of Botany, 42 (179). pp. 509-547.
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Abstract
Stomatal infiltration was observed in irrigation experiments on field crops of cotton, groundnuts, grain sorghum, kenaf, sesame and wheat in the Sudan. On days of peak scores after rain or irrigation scores of all crops except groundnuts were usually positive by sunrise. Rates of increase in score were usually constant or decreasing through the 2 h period of the morning observations. During the midday hour there was usually no systematic trend and mean values of all crops except wheat were generally about the same as at the end of the morning and beginning of the afternoon periods of observation. Afternoon scores usually decreased linearly or approached zero at a slightly increasing rate but sometimes the decrease was very rapid. Peak scores were apparently not affected by fluctuations of total irradiance of 300–1000 W m−2 The problem of relating scores to irradiance in the field is discussed. Scores from all crops except kenaf tended to be smaller towards the end of the season. Flooding of the soil was followed by a large decrease in sesame scores. Scores during the morning period increased less in unirrigated than in irrigated treatments in the absence of rain. The greatest differences between wet and dry treatments were usually during midday and afternoon periods. Regressions relating scores as a percentage of maximum to ‘operational’ soil water content were calculated. In terms of water content (0–60 cm) as a percentage of oven d. wt, maximum scores were at 31–36 percent; at 23–24 per cent scores of kenaf were 20 per cent and of other crops 50 per cent of the maximum. The mean score indicating the level of the plateau attained is likely to be more useful for scheduling irrigation than the time of first positive score or the slope to it. The calculation by available statistical methods of a sample mean or difference between means at which irrigation should be scheduled, when criteria for watering and withholding water at given absolute scores or differences from peak scores have been specified in terms of probabilities, is described
| Item Type: | Article |
|---|---|
| Author Affiliation: | Kenana Research Station Abu Naama, Sudan |
| Subjects: | Plant Physiology and Biochemistry > Plant Physiology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Groundnut Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 12 Jul 2012 09:05 |
| Last Modified: | 12 Jul 2012 09:06 |
| Official URL: | http://aob.oxfordjournals.org/content/42/3/509.abs... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/6715 |
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