Kouvelas, A.V. and Aggelis, G. and Alexopoulos, A.A. and Angelopoulos, K.C. (2014) Nitrogen dynamics during growth of sweet sorghum [Sorghum bicolor (L.) Moench] in response to conventional and organic soil fertility management. Australian Journal of Crop Science, 8 (5). pp. 730-737.
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Abstract
The effects of organic and conventional soil fertility management on nitrogen supply and yield of sweet sorghum crop (cv Keller) were studied in two experiments conducted in summer-autumn in W. Greece. Two fertilization treatments, conventional (120 kg N, 120 kg P2O5, 170 kg K2O and 20 kg MgO per ha) and organic (winter cover crop of common vetch, natural white sphagnum peat, 170 kg K2O ha-1) were applied. Plant dry weight biomass, plant nitrogen content, concentration of NO3-N and NH4-N in soil and soil solution were measured. Nitrogen uptake, nitrogen dilution curve and nitrogen nutrition index were estimated. Plant dry weight biomass (1.918-2.078 kg m-2) and soil NO3-N content (0.75-4.74 mg 100 g-1 soil) were not affected by fertilization treatments. Organic fertilization increased NO3-N concentration in soil solution at 30 cm depth during cultivation period (4.12-25.52 mg L-1), soil NH4-N content 74 days after transplanting - DAT (0.14 mg 100 g-1 soil), NO3-N concentration in soil solution at 60 cm depth 74 DAT and NH4-N concentration in soil solution 31 DAT at 30 cm depth (0.10 mg L-1), 45 and 59 DAT at 60 cm depth (0.14 and 0.39 mg L-1, respectively). Conventional fertilization increased soil NH4-N content when estimated at 45 DAT (0.19 mg 100 g-1 soil). Nitrogen uptake was higher in organic soil fertility management 45 DAT (4.61-5.12 g m-2). However, crop nutrition nitrogen index was not affected by treatments. These results indicate that organic soil fertility management provides adequate nitrogen nutrition to sweet sorghum.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Dry weight biomass; nitrogen nutrition index; nitrogen uptake; soil ammonium nitrogen; soil nitrate nitrogen |
| Subjects: | Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Sorghum |
| Depositing User: | Mr T L Gautham |
| Date Deposited: | 07 Jan 2016 05:28 |
| Last Modified: | 07 Jan 2016 05:28 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/14144 |
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