PEARL-MILLET GROWTH AS AFFECTED BY PHOSPHORUS AND WATER

被引:27
作者
PAYNE, WA
LASCANO, RJ
HOSSNER, LR
WENDT, CW
ONKEN, AB
机构
[1] TEXAS AGR EXPTL STN, LUBBOCK, TX USA
[2] TEXAS A&M UNIV SYST, DEPT SOIL & CROP SCI, COLLEGE STN, TX 77843 USA
关键词
D O I
10.2134/agronj1991.00021962008300060005x
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
The interaction of soil water and P supply is of paramount importance to pearl millet [Pennisetum glaucum (L.) R. Br.] growth in Sahelian Africa due to unreliable rainfall and low soil P availability. This study was conducted to quantify the growth response of pearl millet to water supply and P under conditions analogous to the Sahel in terms of climate and soil. Millet was grown for 84 d in pots containing 85 kg of Betis sand (sandy, silicious, thermic Psammentic Paleustalf) at a semiarid location near Lubbock, TX, and harvested at regular intervals. Pots were treated with four levels of applied P (0.00, 1.15, 3.38, and 7.77 g P m-2) and two water levels (water stressed and non-water stressed). Whole plant biomass at final harvest increased within the non-water stressed treatment from 145 g per pot in the 0.00 g P m-2 level to 626 g per pot in the 7.77 g P m-2 level, and from 64 to 220 g per pot within the water stressed treatments. Analysis of variance showed highly significant statistical interaction between water and P level during most of the experiment. Maximum whole plant production rates for non-water stressed plants occurred between 42 and 58 days after emergence (DAE), increasing from 5.0 g d-1 in the 0.00 g P m-2 level to 18.5 g d-1 in the 7.77 g P m-2 level, and between 28 and 42 DAE for water stressed plants, increasing from 1.3 g d-1 to 8.5 g d-1. Growth rates of plant organs also increased with P level irrespective of water level. Our study quantifies the strong influence and interaction of P and water supply on pearl millet growth and development in Sahel-like environments, and demonstrates that water supply under such conditions cannot be effectively managed for pearl millet production without addressing soil fertility constraints.
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页码:942 / 948
页数:7
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