Involvement of Phosphorus in Nitrogen Fixation by Subterranean Clover (Trifolium subterraneum L.)

1981 ◽  
Vol 8 (5) ◽  
pp. 427 ◽  
Author(s):  
AD Robson ◽  
GW O'hara ◽  
LK Abbott
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Phosphorus Deficiency ◽  
Mycorrhizal Fungus ◽  
Subterranean Clover ◽  
Maximum Growth ◽  
Nodule Formation ◽  
Growth Responses ◽  
Nitrogen And Phosphorus ◽  
Positive Interaction

Effects of phosphorus supply on nodulation and nitrogen fixation in subterranean clover paralleled those on growth and occurred only after, or at the same time as, growth responses. However, correcting phosphorus deficiency increased nitrogen concentrations in tops as well as weight of tops. Effects of vesicular-arbuscular (VA) mycorrhizas on growth, nodulation and nitrogen fixation operated through effects on phosphorus nutrition of the host. Inoculation with a VA mycorrhizal fungus only stimulated nodulation and nitrogen fixation when insufficient phosphorus was applied for maximum growth of the non-mycorrhizal plant. Phosphorus concentrations in nodules greatly exceeded those in either tops or roots in both mycorrhizal and non-mycorrhizal plants and with phosphorus levels ranging from severely deficient to luxury supply for plant growth. Nitrogen applied after nitrogen fixation had commenced increased fresh weight of tops to a greater extent where phosphorus was non-limiting to growth. This positive interaction between nitrogen and phosphorus on the growth of nodulated nitrogen-fixing subterranean clover suggests that phosphorus deficiency does not limit growth in legumes by decreasing nitrogen fixation. It is concluded that increasing phosphorus supply increases nitrogen fixation in subterranean clover by stimulating host plant growth rather than by effects on either rhizobial growth and survival or on nodule formation and function.

Influence of increasing soil phosphorus levels on interactions between vesicular–arbuscular mycorrhizae and Rhizobium in soybeans

1980 ◽  
Vol 58 (20) ◽  
pp. 2200-2205 ◽  
Author(s):  
S. Asimi ◽  
V. Gianinazzi-Pearson ◽  
S. Gianinazzi
Keyword(s):  
Plant Growth ◽  
Arbuscular Mycorrhizae ◽  
Nitrogenase Activity ◽  
Mycorrhizal Fungus ◽  
Growth Stimulation ◽  
Growth And Yield ◽  
Nodule Formation ◽  
Growth Responses ◽  
Vesicular Arbuscular ◽  
Phosphate Fertilization

Growth and yield increases, obtained in nodulated soybeans growing in unamended sterile soil by inoculation with the vesicular–arbuscular (VA) mycorrhizal fungus Glomus mosseae, were accompanied by improved P uptake, lower root to shoot ratios, better nodulation with higher nitrogenase activity, and modifications in the pattern of the latter during plant growth. Stimulation of nitrogenase activity occurred early in plant development and preceded plant growth responses by about 2 weeks. Phosphate fertilization increased yield, percent P but not percent N of both mycorrhizal and nonmycorrhizal soybeans, and also modified the pattern and amount of nitrogenase activity during plant growth. Additions of 0.25 g KH2PO4/kg to the soil eliminated the mycorrhizal effect on plant growth, but nodule formation and nitrogenase activity were still significantly stimulated by the mycorrhizal infection. Mycorrhizal effects on nodulation were eliminated with 0.5 g KH2PO4 and on nitrogenase activity with the addition of 1.0 g KH2PO4. These higher levels of phosphate fertilization considerably diminished infection and, in particular, fungal spread within the roots.

Studies of seed pelleting as an aid to legume inoculation. 5. Effects of incorporation of molybdenum compounds in the seed pellet on inoculant survival, seedling nodulation and plant growth of lucerne and subterranean clover

1980 ◽  
Vol 20 (102) ◽  
pp. 63 ◽  
Author(s):  
RR Gault ◽  
J Brockwell
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Nitrogen Content ◽  
Significant Relationship ◽  
Storage Time ◽  
Sodium Molybdate ◽  
Subterranean Clover ◽  
Ammonium Molybdate ◽  
Molybdic Acid ◽  
Molybdenum Disulphide

Four molybdenum compounds were mixed with lime and applied as coatings to inoculated seed of lucerne (Hunter River) and subterranean clover (Mount Barker). The seed was sown immediately in molybdenum-deficient soil in the field or stored for periods up to 84 days before sowing. As storage time lengthened, the survival of both lucerne and clover rhizobia was adversely affected by sodium molybdate but not by molybdic acid, ammonium molybdate or molybdenum disulphide. This effect was reflected in poorer nodulation in the sodium molybdate treatments. Nitrogen fixation, using foliage nitrogen content as an index, was always higher in the molybdenum treatments than in the no-molybdenum controls. Both species appeared able to extract molybdenum from molybdenum disulphide. Otherwise, there were no treatment differences in plant growth, but there was a significant relationship between the proportion of seedlings nodulated by the inoculant strains and the amount of nitrogen fixation. It is concluded that seed-applied molybdenum would benefit pasture establishment in some circumstances and would not interfere with inoculant survival or seedling nodulation provided that sodium molybdate was not used for the purpose.

Nitrogen and phosphorus concentrations and allocation strategies among shrub organs: the effects of plant growth forms and nitrogen-fixation types

2018 ◽  
Vol 427 (1-2) ◽  
pp. 305-319 ◽  
Author(s):  
Qiang Zhang ◽  
Gaoming Xiong ◽  
Jiaxiang Li ◽  
Zhijun Lu ◽  
Yuelin Li ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Growth Forms ◽  
Nitrogen And Phosphorus ◽  
Allocation Strategies

The response of subterranean clover (Trifolium subterraneum L.) to foliar applications of phosphorus

1969 ◽  
Vol 20 (3) ◽  
pp. 435 ◽  
Author(s):  
D Bouma
Keyword(s):  
Phosphorus Deficiency ◽  
Subterranean Clover ◽  
Dry Weight ◽  
Phosphorus Compounds ◽  
Control Treatment ◽  
Growth Responses ◽  
Solution Ph ◽  
River Sand ◽  
Poor Growth ◽  
Trifoliate Leaf

Subterranean clover plants were grown in river sand or in culture solutions with and without phosphorus. Some phosphorus-deficient plants were sprayed once every 2–3 days with solutions (pH 2.5) of several phosphorus compounds at various concentrations, with and without wetting agents. Dry weights of tops and roots were significantly increased by most spray treatments compared with control plants grown without phosphorus. Foliar applications of 50 mM phosphoric acid solutions, containing little or no wetting agent, generally gave the greatest response. In the first experiment the plant dry weight in the best spray treatment was twice as high and in the second experiment 3.5 times as high as in the controls without applied phosphorus. In these spray treatments plant dry weight was no more than 40% of that in the control treatment receiving root phosphorus. Two days after application of 32P (solution pH 5.5, 0.01 mM phosphate) to the centre leaflet of either the first or the fourth trifoliate leaf, 70% of the tracer could be removed by washing with 20 ml water. Seven days after application of the tracer the treated leaflet of the first or the fourth trifoliate leaf still contained 77 or 70% respectively of the amount absorbed by the plant. In another experiment, in which 32P was applied in a 30 mM H3PO4solution at pH 2.5 or 5.0, washing of the treated leaflet 2 days after application removed 42 and 60% of the tracer respectively. Seven days after application the treated leaflet contained 28 and 34% respectively of the residue after washing. Relatively slow rates of uptake of phosphorus applied to the leaves were considered to be at least partly responsible for the poor growth responses compared with phosphorus applied to the roots. It was concluded that foliar applications of phosphorus offered little scope as a practical means of hastening the recovery from phosphorus deficiency.

Fertility studies of pasture soils in the wet tropical coast of Queensland. 3. Basaltic soils

1972 ◽  
Vol 12 (54) ◽  
pp. 49 ◽  
Author(s):  
JK Teitzel ◽  
RC Bruce
Keyword(s):  
Plant Growth ◽  
Soil Nitrogen ◽  
Phosphorus Deficiency ◽  
Growth Responses ◽  
Nitrogen Status ◽  
Fertility Status ◽  
High Soil ◽  
Basaltic Soils ◽  
Tropical Coast

Results of thirteen investigations into the fertility status of fifteen basaltic soils in the wet tropical coast of Queensland are presented. Although farming experience has shown these soils to be among the most fertile in the area, a widespread phosphorus deficiency is recorded. Plant growth responses to molybdenum, sulphur and calcium also occurred. The molybdenum deficiency appears to be particularly important in older , pastures where the initailly high soil nitrogen status has been depleted.

Fertility studies of pasture soils in the wet tropical coast of Queensland. 5. Mixed alluvial soils

1973 ◽  
Vol 13 (62) ◽  
pp. 306 ◽  
Author(s):  
JK Teitzel ◽  
RC Bruce
Keyword(s):  
Plant Growth ◽  
Nutritional Status ◽  
Phosphorus Deficiency ◽  
Alluvial Soils ◽  
Growth Responses ◽  
Wet Tropics ◽  
Growth Experiments ◽  
Tropical Coast

Results of sixteen plant growth experiments examining the nutritional status of mixed alluvial soils in the wet tropics are presented. A phosphorus deficiency is widespread and, in certain situations, extreme. Significant plant growth responses to calcium, copper, molybdenum, calcium + sulphur, magnesium + sulphur, and molybdenum + sulphur + manganese treatments were also recorded.

scholarly journals Interactions of nitrogen and phosphorus cycling promote P acquisition and explain synergistic plant‐growth responses

Ecology ◽  
2020 ◽  
Vol 101 (5) ◽  
Author(s):  
Per Marten Schleuss ◽  
Meike Widdig ◽  
Anna Heintz‐Buschart ◽  
Kevin Kirkman ◽  
Marie Spohn
Keyword(s):  
Plant Growth ◽  
Phosphorus Cycling ◽  
Growth Responses ◽  
Nitrogen And Phosphorus ◽  
P Acquisition

Reaction of zinc with soil affecting its availability to subterranean clover. 2. Effect of soil properties on the relative effectiveness of applied zinc

Soil Research ◽  
1990 ◽  
Vol 28 (2) ◽  
pp. 303 ◽  
Author(s):  
RF Brennan
Keyword(s):  
Plant Growth ◽  
Soil Properties ◽  
Relative Effectiveness ◽  
Multiple Linear Regression Model ◽  
Subterranean Clover ◽  
Free Calcium ◽  
Alkaline Soils ◽  
Growth Responses ◽  
Matter Production ◽  
Zinc Application

The effect of moist incubation on the availability of applied zinc was examined on a range of Australian soils. Incubating soil with applied zinc decreased the uptake of zinc by subterranean clover and DTPA extractable zinc (ZnD) on all soils relative to freshly applied zinc. On soils where plant growth was increased by zinc application, prior incubation of the soil led to decreased plant growth responses to zinc. The relative effectiveness (RE) of zinc application for subterranean clover growth was measured by dry matter production, uptake of zinc by shoots and ZnD. Values obtained by all three methods of determining the RE were closely correlated. The extent of the decline in availability with incubation differed among soils being greater in alkaline soils, in soils with high clay contents, in soils with high levels of organic carbon , and in soils with free calcium carbonate. A multiple linear regression model was used to explain the relationship between the RE and the soil properties (r2 > 0.87).

Effects of Phosphorus Deficiency on Growth and Nitrogen Fixation of Soybean after Nodule Formation

2009 ◽  
Vol 35 (7) ◽  
pp. 1344-1349 ◽  
Author(s):  
Shu-Jie MIAO ◽  
Yun-Fa QIAO ◽  
Xiao-Zeng HAN ◽  
Shu-Qi WANG ◽  
Hai-Bo LI
Keyword(s):  
Nitrogen Fixation ◽  
Phosphorus Deficiency ◽  
Nodule Formation
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