+ Site Statistics
+ 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


Click here to order any other PDF Full Text

Accession: 001554199

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

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:

Other references

Kim, M-Hyun.; Bu, S.Young.; Choi, M-Kyeong., 2012: Daily calcium intake and its relation to blood pressure, blood lipids, and oxidative stress biomarkers in hypertensive and normotensive subjects. Several studies revealed that low calcium intake is related to high prevalence of cardiovascular diseases such as hypertension. The prevalence of hypertension is high in Koreans along with their low dietary calcium consumption. Thus, the aim of th...

Paakkari I.; Paakkari P.; Karppanen H., 1977: Central cardio vascular effects of the selective histamine h 2 receptor agonist dimaprit in the rat. Acta Pharmacologica et Toxicologica Supplementum 41(4): 67

Arnold, A.C.; Badr, M.A.; Hepler, R.S., 1996: Fluorescein angiography in nonischemic optic disc edema. Objective: To determine whether nonischemic optic disc edema is associated with significant delay in fluorescein angiographic optic disc filling. Methods: Fluorescein angiograms from 16 patients with acute papillitis, five with papilledema, and on...

Ostrov, N.; Gazit, E., 2010: Genetic engineering of biomolecular scaffolds for the fabrication of organic and metallic nanowires. Angewandte Chemie 49(17): 3018-3021

Hughes, P.E.; Tove, S.B., 1980: Identification of deoxy-alpha-tocopherolquinol as another endogenous electron donor for biohydrogenation. Solvent extracts of Butyrivibrio fibrisolvens contain 2-[3, 7, 11, 15-tetramethylhexadecyl]-3, 5, 6-trimethyl-benzoquinol (deoxy-alpha-tocopherolquinol) that can serve as an alternate electron donor for alpha-tocopherolquinol for the biohydrogenat...

Koch, W.H.; Henrikson, E.N.; Kupchella, E.; Cebula, T.A., 1994: Salmonella typhimurium strain TA100 differentiates several classes of carcinogens and mutagens by base substitution specificity. The mutational specificity of N-methylnitrosourea (MNU), nitrosoguanidine (MNNG), methyl methanesulfonate (MMS), sodium azide (NaN-3), 4-nitroquinoline oxide (4NQO), benzo(a)pyrene (BP), nitrofurantoin (NF), aflatoxin B-1 (AFB-1), adriamycin (ADM)...

Rainkie, D.; Ensom, M.H.H.; Carr, R., 2015: Pediatric Assessment of Vancomycin Empiric Dosing (PAVED): a Retrospective Review. Pediatric studies and anecdotal experience suggest that current empiric vancomycin dosing does not reach serum trough concentration targets of at least 10 mg/L for uncomplicated infections or 15-20 mg/L for serious or complicated infections. This...

Knauss, P.J., 1980: Staff nurse preceptorship: an experiment for graduate nurse orientation. Journal of Continuing Education in Nursing 11(5): 44-46

FINKE.S.R.; GRIECO.M.H.; CONNELL.J.T.; SMITH.E.C.; SHERMAN.W.B., 1965: Results Of Comparative Skin Tests With Penicilloyl-Polylysine And Penicillin In Patients With Penicillin Allergy. Intracutaneous tests in 120 patients with a previous history of penicillin allergy yielded positive results with penicilloyl-polylysine in 37% and penicillin G in 15% of patients tested up to 20 years after their reactions. There was an inverse re...

Muharjamova, I.; Zatsepina, O., 1992: Distribution of silver proteins and B23 during the micronucleation of metaphase cells. Molecular Biology of the Cell 3(SUPPL ): 134A