Yield response to applied nutrients and estimates of N-2 fixation in 33-year-old soybean-wheat experiment on a vertisol

Singh, Muneshwar, Wanjari, R. H., Dwivedi, Anil and Dalal, Ram (2012) Yield response to applied nutrients and estimates of N-2 fixation in 33-year-old soybean-wheat experiment on a vertisol. Experimental Agriculture, 48 3: 311-325. doi:10.1017/S0014479712000129


Author Singh, Muneshwar
Wanjari, R. H.
Dwivedi, Anil
Dalal, Ram
Title Yield response to applied nutrients and estimates of N-2 fixation in 33-year-old soybean-wheat experiment on a vertisol
Journal name Experimental Agriculture   Check publisher's open access policy
ISSN 0014-4797
1469-4441
Publication date 2012-07
Sub-type Article (original research)
DOI 10.1017/S0014479712000129
Volume 48
Issue 3
Start page 311
End page 325
Total pages 15
Place of publication Cambridge, United Kingdom
Publisher Cambridge University Press
Collection year 2013
Language eng
Formatted abstract
Soybean-wheat systems are the major grain production systems on vertisols in Madhya Pradesh, India. A study on yield response to nutrients (N, P, K, S and Zn) and estimation of N 2 fixation by soybean under different nutrient combinations was studied in a 33-year-old, long-term experiment on soybean- wheat-maize system. For estimation of N 2 fixation, annual input-output N balance technique was used. The experiment was initiated in June 1972, comprising eight treatments, viz. control (no fertiliser and no manure), 100% N, 100% NP, 100% NPK, 150% NPK, 100% NPK + 15 t farmyard manure (FYM), 100% NPK + Zn and 100% NPK - S with four replications arranged in a randomised block design. The amount of N applied (100%) to each crop of soybean, wheat and maize was 20, 120 and 80 kg ha -1, P (100%) 35, 35 and 26 kg ha -1 and K (100%) 16, 32 and 16 kg ha -1, respectively. FYM was applied one week before the onset of monsoons. Both soybean and wheat yields responded to applied N and P during all these years. The yield response to K was observed after 10 years. The estimated amount of N 2 fixed by soybean annually varied from 62.8 to 161.1 kg ha -1; however, the net gain of N in soil after offsetting the N derived by soybean from soil varied from 24.2 to 66.5 kg ha -1 annually.Maximum N gain was recorded on application of P. There was a linear relationship between the amount of harvestable biomass N and residual biomass N, whereas quantity of N added to soil has a curvilinear relationship with the harvestable biomass N. The highest percentage of N derived from the atmosphere (%Ndfa) was recorded in the control treatment, but the highest amount of N 2 fixed was found in the 100% NPK treatment. Balanced use of nutrient is the best option to harness the N 2 fixation potential of soybean.
Keyword Nitrogen-fixation
Isotope-dilution
Glycine-max
N balance
Soil
Irrigation
Rotation
Legumes
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: April 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2013 Collection
 
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