Nitrogen Use Efficiency and its Balance Under Pearl Millet and Sorghum as Influenced by Long Term Manure and Fertilizer Application in Dryland Vertisols

Jothimani, S. (2012) Nitrogen Use Efficiency and its Balance Under Pearl Millet and Sorghum as Influenced by Long Term Manure and Fertilizer Application in Dryland Vertisols. Madras Agriculturl Journal, 99 (1-3). pp. 55-61.

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Nitrogen ranks first among the applied inputs to maximize output in agriculture and its demand increasing in equivalent to the rate of increase in population. Improved varieties alone will not be sufficient to increase production unless adopting the suitable agronomic and efficient nutrient management practices. A permanent manurial experiment (PME) on millets under dry farming was initiated during 1982 in a randomized block design with nine treatments replicated thrice comprising of full and 50 % recommended dose of N as inorganic and organic source and P as inorganic using pearl millet (or) and sorghum as a test crop alternatively. On an average PFP was 44.36 kg of grain per kg of nitrogen applied to sorghum and about 24.14 kg of grain was produced per kg of nitrogen applied to pearl millet irrespective of the source. Among the two millet crops grown, sorghum had higher agronomic efficiency than pearl millet due to higher nutrient absorbing capacity. It varied from 7.02 to 16.55 and 3.41 to 7.28 kg N ha-1 in sorghum and pearl millet respectively. The conjunctive use of both organic and inorganic source of N along with reduced dose of phosphorus registered higher agronomic efficiency in millets. The physiological efficiency of sorghum and pearl millet was 30.30 and 26.11 kg kg (N)-1 respectively. The fraction of applied N that is absorbed by a crop is expressed as apparent N recovery. The mean recovery efficiency ranged from 23.33 to 82.71 and 13.27 to 27.58 kg kg (N)-1 in sorghum and pearl millet respectively. Application of 50 % of recommended dose of N and P to both sorghum and pearl millet recorded lower mean recovery efficiency due to less nutrient uptake. Net nitrogen balance was negative in all the treatments irrespective of the source of N added after cultivating two crops of pearl millet and three crops of sorghum. The net negative nitrogen balance in the early years of pearl millet cultivation was due to more nitrogen taken up by the previous sorghum and also due to the poor nitrogen utilization by the pearl millet as evidenced from the higher mean agronomic efficiency of sorghum (37.13 kg kg(N)-1) and very poor mean physiological efficiency of pearl millet (17.89 kg kg(N)-1).

Item Type: Article
Uncontrolled Keywords: Nitrogen, N use efficiency, Nitrogen balance, Pearl millet, Vertisols, Drylands
Author Affiliation: AICRPDA Main Centre, Agricultural Research Station, Tamil Nadu Agricultural University, Kovilpatti - 628 501
Subjects: Plant Protection
Soil Science and Microbiology > Soil Sciences
Divisions: Millet
Depositing User: Mr B Krishnamurthy
Date Deposited: 24 Jan 2013 06:04
Last Modified: 24 Jan 2013 06:04

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