EurekaMag.com logo
+ Site Statistics
References:
48,252,460
Abstracts:
22,798,453
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Contributions of fixed nitrogen and soil nitrate to the nitrogen economy of irrigated soybean


, : Contributions of fixed nitrogen and soil nitrate to the nitrogen economy of irrigated soybean. Soil Biology & Biochemistry 20(5): 711-718

Effects of soil nitrate and numbers of Bradyrhizobium japonicum on the development and functioning of a soybean symbiosis and on crop production were studied in a field experiment at Breeza, New South Wales. Bragg soybean was grown with irrigation on soil, initially free of B. japonicum, with four rates of fertilizer-N (0, 100, 200, 300 kg N ha-1 as ammonium nitrate applied 6 weeks before sowing to provide four concentrations of soil nitrate) and four rates of inoculation [nil, normal (n), 100n, 1000m]. The inoculant strain was B. japonicum CB1809. Observations were made on nodulation, the relative abundance of ureides in xylem exudates as an index of N2 fixation, dry matter and seed yield, and total nitrogen in shoots and seed. Results showed clearly that soil nitrate repressed nodulation, that the effect was magnified as soil nitrate concentrations increased, but that inhibition was substantially ameliorated by increased numbers of rhizobia. The relative abundance of ureides in xylem exudates responded similarly. The highest yields of dry matter and of N in shoots and in seed occurred at the highest rates of inoculation (100n, 1000n) at intermediate and high soil nitrate (N100, N200, N300); at low soil nitrate (N0), yields were increased by inoculation per se but not by the rate used. Uninoculated plants did not nodulate and yields in these plots reflected concentrations of soil nitrate. Data suggested that soil nitrate and N2 fixation were not always complementary in meeting the N requirements of the growing crop. Absence of rhizobia, except at the highest rate of nitrate, and repression of nodulation at the normal rate of inoculation by intermediate concentrations of nitrate resulted in reduced N yields because of insufficient N supply to the crop during the final stages of growth.

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 001554199

DOI: 10.1016/0038-0717(88)90156-3

Download PDF Full Text: Contributions of fixed nitrogen and soil nitrate to the nitrogen economy of irrigated soybean


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Salako, L.A.; Adio, R.A.; Sowunmi, A.; Walker, O., 1990: Parenteral sulphadoxine-pyrimethamine (Fansidar): an effective and safe but under-used method of anti-malarial treatment. One hundred and eighteen patients with acute falciparum malaria were randomized into treatment with either im or oral sulfadoxine-pyrimethamine (Fansidar, Roche) and the results were compared with those from 68 patients treated in parallel with ch...

Abrahao, I.O.; Abrahao, J.T.M., 1976: Crystallization of copper chloride applied to cassava (Manihot esculenta Crantz). The effects of extracts of leaves, stems, roots and flowers of cassava on the morphology of crystallization of copper chloride was investigated using toxic and non-toxic cv. It was possible to differentiate between cv. using this technique.

Sundin, G.W.; Bender, C.L., 1995: Expression of the strA-strB streptomycin resistance genes in Pseudomonas syringae and Xanthomonas campestris and characterization of IS6100 in X. campestris. Expression of the strA-strB streptomycin resistance (Smr) genes was examined in Pseudomonas syringae pv. syringae and Xanthomonas campestris pv. vesicatoria. The strA-strB genes in P. syringae and X. campestris were encoded on elements closet rela...

Margalit, E.; Biederman, I.; Herald, S.B.; Yue, X.; von der Malsburg, C., 2016: An applet for the Gabor similarity scaling of the differences between complex stimuli. NlmCategory="UNASSIGNED">It is widely accepted that after the first cortical visual area, V1, a series of stages achieves a representation of complex shapes, such as faces and objects, so that they can be understood and recognized. A...

Ranson, H.P.apanthadara, L.; Hemingway, J., 1997: Cloning and characterization of two glutathione S-transferases from DDT-resistant strain of Anopheles gambiae. Two cDNA species, aggst1-5 and aggst1-6, comprising the entire coding region of two distinct glutathione S-transferases (GSTs) have been isolated from a 1,1,1-trichloro-2,2-bis-(p-chlorophenyl) ethane (DDT) resistant strain (ZANDS) of Anopheles ga...

Karlsson J O., 1979: Proteins of axonal transport interaction of rapidly transported proteins with lectins. Rapidly transported fucose-labeled glycoproteins from the optic system of the rabbit were solubilized with the non-ionic detergent Berol 172. The major labeled components were bound to wheat germ agglutinin or concanavalin A coupled to Sepharose b...

Duan, L.; Song, J.; Li, X.; Yuan, H., 2010: The behaviors and sources of dissolved arsenic and antimony in Bohai Bay. In this paper, we determined the concentrations of antimony species (antimonite (Sb(III)), antimonate (Sb(V)) and dissolved inorganic antimony (DISb)) and arsenic, in Bohai Bay seawaters, as well as the relationships of the analytes with environme...

Jin, W.; Yun, C.; Hobbie, A.; Martin, M.J.; Sorensen, P.H.B.; Kim, S-Jin., 2007: Cellular transformation and activation of the phosphoinositide-3-kinase-Akt cascade by the ETV6-NTRK3 chimeric tyrosine kinase requires c-Src. The ETV6-NTRK3 (EN) chimeric tyrosine kinase, a potent oncoprotein expressed in tumors derived from multiple cell lineages, functions as a constitutively active protein-tyrosine kinase. ETV6-NTRK expression leads to the constitutive activation of...

Kennerley, PR., 1991: A review of the status and distribution of the black-faced spoonbill Platalea minor. Bangkok Bird Club Bulletin, 88: 4

Koptsik, I.K.; Trompyel, A.F., 1994: Studying gluten polymorphism in winter wheat under breeding for quality. Vyestsi Akademii Ahrarnykh Navuk Byelarusi 0(3): 24-28, 124