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Soil Phosphorus Availability and Pearl Millet Water-Use Efficiency

OAR@ICRISAT

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Relation http://oar.icrisat.org/1469/
http://dx.doi.org/10.2135/cropsci1992.0011183X003200040035x
 
Title Soil Phosphorus Availability and Pearl Millet Water-Use Efficiency
 
Creator Payne, W A
Drew, M C
Hossner, L R
Lascano, R J
Onken, A B
Wendt, C W
 
Subject Millets
 
Description The effects of P and water stress on transpirational water-use efficiency (WUET) of pearl millet (Pennisetum glaucum) cv. ICTP 8203 were studied in outdoor pot and growth chamber experiments. Plants were grown outdoors under semiarid conditions in covered pots containing 85 kg of acid, P-deficient Betis sand (sandy, siliceous, thermic Psammentic Paleustalf). Pots were given 0-7.77 g P/m² (equivalent to 0-70 kg P/ha), water stressed or not stressed, and plants harvested at 14-d intervals. Significant main and interactive effects on WUET due to P level, water treatment, and harvesting date occurred. The slope of the curve relating DM to cumulative transpiration increased with P level and water stress when data from all harvests were pooled. In the growth chamber, WUET of non-water-stressed plants ranged with increasing P level from 3.22 to 9.12 g/kg at 29 d after sowing (DAS) in pots containing 6 kg soil, and from 0.84 to 9.24 g/kg at 49 DAS in pots containing 18 kg soil. The ratio of leaf net photosynthetic rate to transpiration (WUEgas) at 500 µmol/m² per s photosynthetic photon flux density (PPFD) ranged from 1.88 µg/mg for plants receiving no P to 10.25 µg/mg for those receiving 0.31 g P/6 kg soil. Between PPFD levels of 500 and 2000 µmol/m² per s plants receiving no P increased WUEgas to only 3.60 µg/mg, whereas those receiving higher levels of P increased WUEgas to as much as 18.2 µg/mg. It was concluded that water supply in semiarid environments cannot be effectively managed for improved crop production without addressing soil fertility constraints.
 
Date 1992
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/1469/1/CropSci32_4_1010-1015_1992.pdf
Payne, W A and Drew, M C and Hossner, L R and Lascano, R J and Onken, A B and Wendt, C W (1992) Soil Phosphorus Availability and Pearl Millet Water-Use Efficiency. Crop Science, 32 (4). pp. 1010-1015.