The micro-climate of narrow- and wide-row sorghum with equal plant densities

Owonubi, J.J. and Kanemasu, E.T. and Powers, W.L. (1975) The micro-climate of narrow- and wide-row sorghum with equal plant densities. Agricultural Meteorology, 15 (1). pp. 61-69.

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Net radiation, lysimetric evapotranspiration, soil heat flux, temperature, vapour pressure and wind speed were measured within and above narrow- and wide-row sorghum at equal plant densities. Total energy balance for 9 clear days showed no significant difference in net radiation above the narrow and wide rows. Evapotranspiration accounted for an average of 88% and 89% of net radiation in narrow and wide rows, respectively. Evapotranspiration as a percentage of net radiation exceeded 100% in wide rows on 25 and 26 Aug. 1973. Temperature inversions above the crop canopies confirmed the presence of large-scale advection during the latter part of the growing season. Negative sensible heat at the beginning of the season and the below-canopy energy balance suggested within-row advection, particularly in wide rows. Temperature decreased with down-wind distance from a stubble field but vapour pressure increased; stomatal resistance decreased and leaf water potential became less negative, indicating more favourable plant-water balance with distance down-wind

Item Type: Article
Author Affiliation: Evapotranspiration Lab., Kansas Agric. Exp. Sta., Manhattan, Kansas, USA
Subjects: Plant Production
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 16 Jul 2012 05:40
Last Modified: 16 Jul 2012 05:40
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