Abstract
Abstract In the southeastern Coastal Plains determinate soybean [Clycine max (L.) Merr.] is grown on soils with low water‐holding capacities and N contents. Therefore, N fixation and management of water are important in soybean production. Several studies were conducted to increase the understanding of the interaction of these two factors on soybean growth and yield. Experiments were conducted in 1976, 1978, and 1979 on a ‘ Norfolk loamy sand (Typic Paleudult) with soybean of maturity groups VI, VII, and VIII grown under irrigated and nonirrigated conditions each year with soil water monitored to 60‐cm depths. In 1979 the plots were split by inoculating with Rhizobium japonicum strain 110 at a rate of 108 organisms/cm of row. Serological analyses indicated that strain 110 infection of nodules was near 0% in the noninoculated plots and 7 to 21% in the inoculated plots. Irrigation water increased leaf‐N concentration and seed yield during the severe droughts of 1976 and 1978; yields were >3 and <1.5 t/ha for irrigated and nonirrigated soybean, respectively. In 1979 there was only a short‐term drought which did not affect the total N accumulation, nor leaf‐N content for the noninoculated soybean. However, the drought was associated with a significant reduction in leaf‐N content of the inoculated soybean, 4.74 and 4.36%, irrigated and nonirrigated, respectively. Additionally, there was a significantly more negative leaf xylem potential for inoculated than for noninoculated soybean plants under drought. These differences, coupled with varying maturities, contributed to a significant variety x irrigation x R. japonicum strain 110 interaction for yield. These results show that water management affects soybean N accumulation, distribution, and yield and that R. japonicum strain 110 may intensify or diminish the impact of water regimes on determinate soybean growth and yield.
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Claims 6
Claim · model-written summary
Irrigation increased leaf-N concentration and seed yield of soybean during the severe droughts of 1976 and 1978.
- Taxon
- determinate soybeanst0
- Treatment
- Irrigation watere0
- Outcome
- leaf‐N concentration and seed yielde0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Irrigation water increased leaf‐N concentration and seed yield during the severe droughts of 1976 and 1978”
t0“determinate soybeans”
Claim · model-written summary
Yields were >3 t/ha irrigated and <1.5 t/ha nonirrigated.
- Taxon
- soybean
Glycine maxe0 - Treatment
- irrigatede0
- Outcome
- yieldse0
- Value
- >3 and <1.5 t/hae0
- Comparator
- nonirrigatede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yields were >3 and <1.5 t/ha for irrigated and nonirrigated soybean, respectively”
Claim · model-written summary
In 1979 a short drought did not affect total N accumulation.
Not reportedComparatorDirection
Verbatim
e0“In 1979 there was only a short‐term drought which did not affect the total N accumulation”
t0“determinate soybeans”
Claim · model-written summary
Drought significantly reduced leaf-N content of inoculated soybean (4.74 vs 4.36%, irrigated vs nonirrigated).
- Taxon
- soybeanGlycine maxe0
- Treatment
- droughte0
- Outcome
- leaf‐N contente0
- Direction
- reductione0
- Value
- 4.74 and 4.36%e0
- Comparator
- irrigatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the drought was associated with a significant reduction in leaf‐N content of the inoculated soybean, 4.74 and 4.36%, irrigated and nonirrigated, respectively”
t0“determinate soybeans”
Claim · model-written summary
Under drought, inoculated soybean had a significantly more negative leaf xylem potential than noninoculated.
- Taxon
- soybeanGlycine maxe0
- Treatment
- inoculatede0
- Outcome
- leaf xylem potentiale0
- Direction
- more negativee0
- Comparator
- noninoculatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significantly more negative leaf xylem potential for inoculated than for noninoculated soybean plants under drought”
Claim · model-written summary
A significant variety x irrigation x R. japonicum strain 110 interaction occurred for yield.
- Taxon
- determinate soybeanst0
- Treatment
- irrigatione0
- Interactor
- R. japonicum strain 110e0symbiont
- Outcome
- yielde0
Not reportedDirection
Verbatim
e0“a significant variety x irrigation x R. japonicum strain 110 interaction for yield”
t0“determinate soybeans”
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