A two-year field assessment on the effect of slow release of nitrogenous fertiliser on N2O emissions from a wheat cropping system
Nirmali Bordoloi A and K. K. Baruah A B
+ Author Affiliations
- Author Affiliations
A Department of Environmental Science, Tezpur University, Tezpur-784028, Assam, India.
B Corresponding author. Email: kkbaruah14@gmail.com; kkbaruah@tezu.ernet.in
Soil Research 55(2) 191-200 https://doi.org/10.1071/SR16001
Submitted: 3 January 2016 Accepted: 7 July 2016 Published: 26 September 2016
Abstract
Nitrous oxide (N2O) is considered a major contributor to global climate change in addition to carbon dioxide and methane. A significant quantity of N2O emission originates from agriculture, largely from high rates of fertiliser application. We studied N2O emissions from wheat field to evaluate the effect of different forms of fertilisers and the potential for emission reduction. Field experiments were conducted for two consecutive seasons with four fertilisers, namely inorganic fertiliser (NPK), starch-coated urea (SCU), neem-coated urea (NCU), and urea alone (UA) in a tropical wheat ecosystem. Gas samples were collected from the field at weekly intervals using the static chamber technique and analysed with a gas chromatograph. The cumulative N2O emissions were higher from the NPK amended field (3.19 kg N2O-N ha–1) followed by UA (3.05 kg N2O-N ha–1). The SCU, NCU, and UA amendments decreased the total N2O emissions by 23%, 12%, and 4%, respectively (P < 0.05) over the application of NPK. The results indicate a good correlation of N2O emissions with soil organic carbon, soil NO3–-N, NH4+-N, leaf area, and plant biomass. The application of SCU resulted in higher grain productivity and was the most effective substitute for conventional fertiliser in terms of reducing N2O emissions from a tropical wheat ecosystem.
Additional keywords: neem-coated urea, nitrous oxide emission, soil mineral N, soil organic carbon, starch-coated urea.
References
Akiyama H, Yan X, Yagi K (2010) Evaluation of effectiveness of enhanced-efficiency fertilizers as mitigation options for N2O and NO emissions from agricultural soils: meta-analysis. Global Change Biology 16, 1837–1846.| Evaluation of effectiveness of enhanced-efficiency fertilizers as mitigation options for N2O and NO emissions from agricultural soils: meta-analysis.Crossref | GoogleScholarGoogle Scholar |
Bateman EJ, Baggs EM (2005) Contributions of nitrification and denitrification to N2O emissions from soils at different water-filled pore space. Biology and Fertility of Soils 41, 379–388.
| Contributions of nitrification and denitrification to N2O emissions from soils at different water-filled pore space.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXns1Wrs7c%3D&md5=24e8bc55257f9edb302edab19e3f4c83CAS |
Bhatia A, Sasmal S, Jain N, Pathak H, Kumar R, Singh A (2010) Mitigating nitrous oxide emission from soil under conventional and no-tillage in wheat using nitrification inhibitors. Agriculture, Ecosystems & Environment 136, 247–253.
| Mitigating nitrous oxide emission from soil under conventional and no-tillage in wheat using nitrification inhibitors.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXisFentbs%3D&md5=d6fa583b4c5969b4accbc4274bf6951eCAS |
Borah L, Baruah KK (2016) Nitrous oxide emission and mitigation from wheat agriculture: association of physiological and anatomical characteristics of wheat genotypes. Environmental Science and Pollution Research 23, 709–721.
| Nitrous oxide emission and mitigation from wheat agriculture: association of physiological and anatomical characteristics of wheat genotypes.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2MXhsVOntb3P&md5=8536c0e5ea2f01c7bbd700fa3c737041CAS | 26335526PubMed |
Bouwman AF, Boumas LJM, Baties NH (2002) Emissions of N2O and NO from fertilized fields: summary of available measurement data. Global Biogeochemical Cycles 16, 1–13.
Bowatte S, Newton PCD, Theobald P, Brock S, Hunt C, Lieffering M, Sevier S, Gebbie S, Luo D (2014) Emissions of nitrous oxide from the leaves of grasses. Plant and Soil 374, 275–283.
| Emissions of nitrous oxide from the leaves of grasses.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhtlCntLbI&md5=93c532b953cbd39fc6c31fa9e288094eCAS |
Cai J, Jiang D, Liu F, Dai T, Cao W (2011) Effects of split nitrogen fertilization on post-anthesis photoassimilates, nitrogen use efficiency and grain yield in malting barley. Acta Agriculturae Scandinavica, Section B Soil and Plant Science 61, 410–420.
Carreres R, Sendra J, Ballesteros R, Valiente EF, Quesada A, Carrasco D, Leganes F, de La Cuadra JG (2003) Assessment of slow release fertilizers and nitrification inhibitors in flooded rice. Biology and Fertility of Soils 39, 80–87.
| Assessment of slow release fertilizers and nitrification inhibitors in flooded rice.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3sXps1yhtL4%3D&md5=4eee5aa8bcde262e97d597eaa8f67b9cCAS |
Chen ST, Huang Y (2006) Determination of respiration, gross nitrification and denitrification in soil profile using BaPS system. Journal of Environmental Sciences 18, 937–943.
| Determination of respiration, gross nitrification and denitrification in soil profile using BaPS system.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28XhtVGntLbF&md5=ed12aedbd93a09245e8946dab0ef5273CAS |
Chen S, Huang Y, Zou J (2008) Relationship between nitrous oxide emission and winter wheat production. Biology and Fertility of Soils 44, 985–989.
| Relationship between nitrous oxide emission and winter wheat production.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXos1Wltbw%3D&md5=bd49cb8ce92d4faef31397df131e156eCAS |
Chowdary KPR, Chaithanya KK (2010) Preparation and evaluation of crosslinked starch urea – a new polymer for control release of aceclofenac. Asian Journal of Chemistry 22, 4265–4270.
Dilara PA, Briassoulis D (2000) Degradation and stabilization of low-density polyethylene films used as greenhouse covering materials. Journal of Agricultural Engineering Research 76, 309–321.
| Degradation and stabilization of low-density polyethylene films used as greenhouse covering materials.Crossref | GoogleScholarGoogle Scholar |
Fageria NK (2007) Yield physiology of rice. Journal of Plant Nutrition 30, 843–879.
| Yield physiology of rice.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2sXmt1Squ7c%3D&md5=119a76b89ba67fcdab88969272d6fde2CAS |
Fan X, Li F, Liu F, Kumar D (2004) Fertilization with a new type of coated urea: evaluation for nitrogen efficiency and yield in winter wheat. Journal of Plant Nutrition 27, 853–865.
| Fertilization with a new type of coated urea: evaluation for nitrogen efficiency and yield in winter wheat.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXivFSqtLg%3D&md5=efd2ffc47553b620f9081c1d1506e67eCAS |
Forster P, Ramaswamy V, Artaxo P, Berntsen T, Betts R, Fahey DW, Haywood J, Lean J, Lowe DC, Myhre G, Nganga J, Prinn R, Raga G, Schulz M, Van Dorland R (2007) Changes in atmospheric constituents and in radiative forcing. In ‘Climate Change 2007: the physical science basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change’. (Eds S Solomon, D Qin, M Manning, Z Chen, M Marquis, K Averyt, M Tignor, H Miller) pp. 129–234. (Cambridge University Press: UK and New York)
Ghosh AB, Bajaj JC, Hasan R, Singh D (1983) ‘Soil and water testing methods.’ (Indian Agricultural Research Institute: New Delhi)
Ghosh S, Wilson B, Ghoshal S, Senapati N, Mandale B (2012) Organic amendments influence soil quality and carbon sequestration in the Indo-Gangetic plains of India. Agriculture, Ecosystems & Environment 156, 134–141.
| Organic amendments influence soil quality and carbon sequestration in the Indo-Gangetic plains of India.Crossref | GoogleScholarGoogle Scholar |
Gogoi B, Baruah KK (2012) Nitrous oxide emission from field with different wheat and rice varieties. Pedosphere 22, 112–121.
| Nitrous oxide emission from field with different wheat and rice varieties.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38Xktleiu7s%3D&md5=e311463a23b695b0bb8746878391b069CAS |
Han X, Chen S, Hu X (2009) Controlled-release fertilizer encapsulated by starch/polyvinyl alcohol coating. Desalination 240, 21–26.
| Controlled-release fertilizer encapsulated by starch/polyvinyl alcohol coating.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXjsVCntbY%3D&md5=36199c88187fa3676d7b901af0674553CAS |
Henry S, Texier S, Hallet S, Bru D, Dambreville C, Cheneby D, Bizouard F, Germon JC, Philippot L (2008) Disentangling the rhizosphere effect on nitrate reducers and denitrifiers: insight into the role of root exudates. Environmental Microbiology 10, 3082–3092.
| Disentangling the rhizosphere effect on nitrate reducers and denitrifiers: insight into the role of root exudates.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXhtlGitrbF&md5=3bb52297e6c5fa4c8c7204561258707bCAS | 18393993PubMed |
Huang Y, Zou J, Zheng X, Wang Y, Xu X (2004) Nitrous oxide emissions as influenced by amendment of plant residues with different C:N ratios. Soil Biology & Biochemistry 36, 973–981.
| Nitrous oxide emissions as influenced by amendment of plant residues with different C:N ratios.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXktVemtro%3D&md5=d30b94a947248d5f8187d806e188d566CAS |
Intergovernment Panel on Climate Change (IPCC) (2013) Summary for policymakers. In ‘Climate Change 2013: the physical science basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change’. (Eds TF Stocker, D Qin, GK Plattner, M Tignor, SK Allen, J Boschung, A Nauels, Y Xia, V Bex, PM Midgley) pp. 1–30. (Cambridge University Press: Cambridge, UK)
Johnson JMF, Allmaras RR, Reicosky SS (2006) Estimating source carbon from crop residues, roots and rhizodeposits using the national grain-yield database. Agronomy Journal 98, 622–636.
| Estimating source carbon from crop residues, roots and rhizodeposits using the national grain-yield database.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28XlsFamtb0%3D&md5=b3262889165752fadf7b49e2e367be93CAS |
Jones DL, Nguyen C, Finlay RD (2009) Carbon flow in the rhizosphere: carbon trading at the soil–root interface. Plant and Soil 321, 5–33.
| Carbon flow in the rhizosphere: carbon trading at the soil–root interface.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXos1enu7c%3D&md5=f14d473cce904b3bd6a82cb48051de79CAS |
Keeney DR, Nelson DW (1982) Nitrogen – inorganic forms. In ‘Methods of soil analysis, part 2. Chemical and microbiological properties’. (Eds AL Page, RH Miller, DR Keeney) pp. 674–676. (American Society of Agronomy: Madison, WI)
Kiran U, Patra DD (2003) Medicinal and aromatic plant materials as nitrification inhibitors for augmenting yield and nitrogen uptake of Japanese mint (Mentha arvensis L. Var. Piperascens). Bioresource Technology 86, 267–276.
| Medicinal and aromatic plant materials as nitrification inhibitors for augmenting yield and nitrogen uptake of Japanese mint (Mentha arvensis L. Var. Piperascens).Crossref | GoogleScholarGoogle Scholar | 12688470PubMed |
Kumar U, Jain MC, Pathak H, Majumdar D (2000) Nitrous oxide emission from different fertilizers and its mitigation by nitrification inhibitors in irrigated rice. Biology and Fertility of Soils 32, 474–478.
| Nitrous oxide emission from different fertilizers and its mitigation by nitrification inhibitors in irrigated rice.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXoslWjt7o%3D&md5=504a01604e5a62f40e00086bcf81a668CAS |
Kumbar SG, Kulkarni AR, Dave AM, Aminabhavi TM (2001) Encapsulation efficiency and release kinetics of solid and liquid pesticides through urea formaldehyde crosslinked starch, guar gum, and starch + guar gum matrices. Journal of Applied Polymer Science 82, 2863–2866.
| Encapsulation efficiency and release kinetics of solid and liquid pesticides through urea formaldehyde crosslinked starch, guar gum, and starch + guar gum matrices.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3MXnsl2lt7Y%3D&md5=387ddaecceca6c0dd247358feeba8d77CAS |
Kyaw KM, Toyota K (2007) Suppression of nitrous oxide production by the herbicides glyphosate and propanil in soils supplied with organic matter. Soil Science and Plant Nutrition 53, 441–447.
| Suppression of nitrous oxide production by the herbicides glyphosate and propanil in soils supplied with organic matter.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2sXhtVemsL%2FL&md5=0a3a1164823950790b5eace9a880a66bCAS |
Li N, Ning T, Cui Z, Tian S, Li Z, Lal R (2015) N2O emissions and yield in maize field fertilized with polymer-coated urea under subsoiling or rotary tillage. Nutrient Cycling in Agroecosystems 102, 397–410.
| N2O emissions and yield in maize field fertilized with polymer-coated urea under subsoiling or rotary tillage.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2MXhtFSjt77K&md5=9895a4c3567eb069ae01f95d62061ec7CAS |
Lin S, Iqbal J, Hu R, Feng M (2010) N2O emissions from different land uses in mid-subtropical China. Agriculture, Ecosystems & Environment 136, 40–48.
| N2O emissions from different land uses in mid-subtropical China.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXhtVGku7c%3D&md5=42c0998eb86792db0b452a2a0f86320bCAS |
Lokanadhan S, Muthukrishnan P, Jeyaraman S (2012) Neem products and their agricultural applications. Journal of Biopesticides 5, 72–76.
López-Bellido RJ, López-Bellido L (2001) Efficiency of nitrogen in wheat under Mediterranean conditions: effect of tillage, crop rotation and N fertilization. Field Crops Research 71, 31–46.
| Efficiency of nitrogen in wheat under Mediterranean conditions: effect of tillage, crop rotation and N fertilization.Crossref | GoogleScholarGoogle Scholar |
Lu DR, Xiao CM, Xu SJ (2009) Starch-based completely biodegradable polymer materials. Express Polymer Letters 3, 366–375.
| Starch-based completely biodegradable polymer materials.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXmvFSqtbY%3D&md5=f6df8339528c9cfade2c501a8d2b742dCAS |
Ma J, Ma E, Xu H, Yagi K, Cai Z (2009) Wheat straw management affects CH4 and N2O emissions from rice fields. Soil Biology & Biochemistry 41, 1022–1028.
| Wheat straw management affects CH4 and N2O emissions from rice fields.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXlsVaku7w%3D&md5=a700ea77fa7a0226beed41dd80477426CAS |
Majumdar D, Kumar S, Pathak H, Jain MV, Kumar U (2000) Reducing nitrous oxide emission from an irrigated rice field of North India with nitrification inhibitors. Agriculture, Ecosystems & Environment 81, 163–169.
| Reducing nitrous oxide emission from an irrigated rice field of North India with nitrification inhibitors.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXmsFyrt7k%3D&md5=76c7a13c1d47fff25c8ac4180291e652CAS |
Majumdar D, Pathak H, Kumar S, Jain MC (2002) Nitrous oxide emission from a sandy loam inceptisol under irrigated wheat in India as influenced by different nitrification inhibitors. Agriculture, Ecosystems & Environment 91, 283–293.
| Nitrous oxide emission from a sandy loam inceptisol under irrigated wheat in India as influenced by different nitrification inhibitors.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD38Xms1Kgsb4%3D&md5=a902b3c1495edd01945e60157c466309CAS |
Makino A (2011) Photosynthesis, grain yield, and nitrogen utilization in rice and wheat. Journal of Plant Physiology 155, 125–129.
| Photosynthesis, grain yield, and nitrogen utilization in rice and wheat.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXksFagsbw%3D&md5=79c17dd288e085f78d74ad1e86a4c195CAS |
Malla G, Bhatia A, Pathak H, Prasad S, Jain N, Singh J (2005) Mitigation of nitrous oxide and methane emissions from soil in rice-wheat system of the Indo-Gangetic plain with nitrification and urease inhibitors. Chemosphere 58, 141–147.
| Mitigation of nitrous oxide and methane emissions from soil in rice-wheat system of the Indo-Gangetic plain with nitrification and urease inhibitors.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXhtVahu73L&md5=3514d4edfe69121ff1c7649de420a554CAS | 15571746PubMed |
Mohanty S, Patra AK, Chhonkar PK (2008) Neem (Azadirachta indica) seed kernel powder retards urease and nitrification activities in different soils at contrasting moisture and temperature regimes. Bioresource Technology 99, 894–899.
| Neem (Azadirachta indica) seed kernel powder retards urease and nitrification activities in different soils at contrasting moisture and temperature regimes.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2sXhtlWrsLbF&md5=81f9c158fde70c324ab5dda6bbabb40aCAS | 17360179PubMed |
Nugroho PA, Shimizu M, Nakamato H, Nagatake A, Suwardi S, Sudadi U, Hatano R (2015) Nitrous oxide fluxes from soil under different crops and fertilizer management. Plant, Soil and Environment 61, 385–392.
Oliet J, Planelles R, Segura ML, Artero F, Jacobs DF (2004) Mineral nutrition and growth of containerized Pinus halepensis seedlings under controlled-release fertilizer. Scientia Horticulturae 103, 113–129.
| Mineral nutrition and growth of containerized Pinus halepensis seedlings under controlled-release fertilizer.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXhtVSntbzO&md5=d988776474839f682e6ac7cd975fb848CAS |
Page AL, Miller RH, Keeney DR (1982) ‘Methods of soil analysis, part 2.’ (Soil Science Society of America: Madison, WI)
Parashar DC, Mitra AP, Gupta PK (1996) Methane budget from paddy fields in India. Chemosphere 33, 737–757.
| Methane budget from paddy fields in India.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK28XkvVagtb0%3D&md5=2b208f2c96de68ff02cf94e35867a5d3CAS |
Peng S, Hou H, Xu J, Mao Z, Abudu S, Lou Y (2011) Nitrous oxide emissions from paddy fields under different water managements in southeast China. Paddy and Water Environment 9, 403–411.
| Nitrous oxide emissions from paddy fields under different water managements in southeast China.Crossref | GoogleScholarGoogle Scholar |
Petersen SO, Schjonning P, Thomsen IK, Christensen BT (2008) Nitrous oxide evolution from structurally intact soil as influenced by tillage and soil water content. Soil Biology & Biochemistry 40, 967–977.
| Nitrous oxide evolution from structurally intact soil as influenced by tillage and soil water content.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXhslGqtLc%3D&md5=1c91300eedd8d49bc9fcd43e055a26efCAS |
Prasad R, Power JF (1995) Nitrification inhibitors for agriculture, health and the environment. Advances in Agronomy 54, 233–281.
| Nitrification inhibitors for agriculture, health and the environment.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK2MXlvFCrsb0%3D&md5=40f42aa8d002a70f05356a8ffd5f652bCAS |
Prasad R, Singh S, Saxena VS, Devkumar C (1999) Coating of prilled urea with neem (Azadirachta Indica Juss) oil for efficient nitrogen use in rice. Naturwissenschaften 86, 538–539.
| Coating of prilled urea with neem (Azadirachta Indica Juss) oil for efficient nitrogen use in rice.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK1MXntFGgsrc%3D&md5=fe9cb979c135c64082848df42ad4f47aCAS | 10551949PubMed |
Ravishankara AR, Daniel JS, Portmann RW (2009) Nitrous oxide (N2O): the dominant ozone-depleting substance emitted in the 21st Century. Science 326, 123–125.
| Nitrous oxide (N2O): the dominant ozone-depleting substance emitted in the 21st Century.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXhtF2hs7jF&md5=d412beb03e751c999a0044beb213d53fCAS | 19713491PubMed |
Saggar S, Jha N, Deslippe J, Bolan NS, Luo J, Giltrap DL, Kim DG, Zaman M, Tillman RW (2013) Denitrification and N2O:N2 production in temperate grasslands: processes, measurements, modelling and mitigating negative impacts. The Science of the Total Environment 465, 173–195.
| Denitrification and N2O:N2 production in temperate grasslands: processes, measurements, modelling and mitigating negative impacts.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XhvVKlt73L&md5=2ed2f15654c742395c79bc89669715e7CAS | 23260378PubMed |
Sanchez-Martin L, Sanz-Cobena A, Meijide A, Quemada M, Vallejo A (2010) The importance of the fallow period for N2O and CH4 fluxes and nitrate leaching in a Mediterranean irrigated agroecosystem. European Journal of Soil Science 61, 710–720.
| The importance of the fallow period for N2O and CH4 fluxes and nitrate leaching in a Mediterranean irrigated agroecosystem.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXhtlCrurzE&md5=9da94ccba985c2dea44e08719f0953edCAS |
Shaviv A (2001) Advances in controlled-release fertilizers. Advances in Agronomy 71, 1–49.
| Advances in controlled-release fertilizers.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXot1Smt7o%3D&md5=b17256511df0f3dc11b69bf27600a241CAS |
Sutka RL, Ostrom NE, Ostrom PH, Breznak JA, Gandhi H, Pitt AJ, Li F (2006) Distinguishing nitrous oxide production from nitrification and denitrification on the basis of isotopomer abundances. Applied and Environmental Microbiology 72, 638–644.
| Distinguishing nitrous oxide production from nitrification and denitrification on the basis of isotopomer abundances.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28XmtFeitA%3D%3D&md5=2f5724c6dce4aa712403c7e4c35b2dacCAS | 16391101PubMed |
UNEP (2013) Drawing down N2O to protect climate and the ozone layer. A UNEP Synthesis Report. United Nations Environment Programme (UNEP), Nairobi, Kenya.
Vashishtha M, Dongara P, Singh D (2010) Improvement in properties of urea by phosphogypsum coating. International Journal of ChemTech Research 2, 36–44.
Wang JY, Jia JX, Xiong ZQ, Khalil MAK, Xing GX (2011) Water regime- nitrogen fertilizer-straw incorporation interaction: field study on nitrous oxide emission from a rice agroecosystem in Nanjing, China. Agriculture, Ecosystems & Environment 1414, 437–446.
Yasin BA, Ram M, Singh S, Wani BA (2011) Genetic improvement in yield, yield attributes and leaf rust resistance in semi-dwarf wheat varieties developed in India from last 40 years. International Journal of Agricultural Research 6, 747–753.
| Genetic improvement in yield, yield attributes and leaf rust resistance in semi-dwarf wheat varieties developed in India from last 40 years.Crossref | GoogleScholarGoogle Scholar |
