ISSN:
1573-5036
Keywords:
P nutrition
;
roots
;
soybean
;
water deficits
;
yield
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Phosphorus and water deficits are important limiting factors in agricultural production. A field experiment was carried out with soybean (Glycine max (L.) Merr.) to determine whether the effect of water stress on field-grown soybean changes with soil P availability, and whether soil water content affects plant P nutrition. The soil was a Sadler series (fine-silty, mixed, mesic Glossic Fragiudalf) located at Princeton, Kentucky, USA (37°60′ north, 87°60′ west). The experiment was a factorial with three levels of soil P availability (4, 19 and 32 mg kg−1, Mehlich III) and two of water (irrigated and non-irrigated). Most of the effects of phosphorus and water stress on soybean growth were additive, so that, in general, effects of water stress were similar at each P level. Phosphorus deficiency slowed vegetative development, reduced shoot growth, LAI, P absorption and concentration, seed number, size and yield, and increased root length density in the surface soil. Water stress accelerated crop maturity, reduced shoot growth, LAI, P absorption and concentration, seed number, size and yield, and increased root length density. Some interactions between P and water were observed. Water stress slowed vegetative development only at the lowest P level (P0). The crop had a positive response to increasing P availability in both situations, with and without irrigation, suggesting that P addition would be justified even when a dry growing season is likely to occur.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004469403667
Permalink
