{"id":"https://openalex.org/W2883471550","doi":"https://doi.org/10.5958/0974-0228.2018.00006.3","title":"Site-specific Fertilizer Nitrogen Management in Irrigated Wheat using Chlorophyll Meter (SPAD meter) in the North-western India","display_name":"Site-specific Fertilizer Nitrogen Management in Irrigated Wheat using Chlorophyll Meter (SPAD meter) in the North-western India","publication_year":2018,"publication_date":"2018-01-01","ids":{"openalex":"https://openalex.org/W2883471550","doi":"https://doi.org/10.5958/0974-0228.2018.00006.3","mag":"2883471550"},"language":"en","primary_location":{"id":"doi:10.5958/0974-0228.2018.00006.3","doi":"https://doi.org/10.5958/0974-0228.2018.00006.3","is_oa":true,"landing_page_url":"https://doi.org/10.5958/0974-0228.2018.00006.3","pdf_url":null,"source":{"id":"https://openalex.org/S2764398350","display_name":"Journal of the Indian Society of Soil Science","issn_l":"0019-638X","issn":["0019-638X","0974-0228"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":["poland-20","russia-white-list-3"],"host_organization":"https://openalex.org/P4320800641","host_organization_name":"Indian Society of Soil Science","host_organization_lineage":["https://openalex.org/P4320800641"],"host_organization_lineage_names":["Indian Society of Soil Science"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of the Indian Society of Soil Science","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"diamond","oa_url":"https://doi.org/10.5958/0974-0228.2018.00006.3","any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5028118756","display_name":"Bijay S\u0131ngh","orcid":"https://orcid.org/0000-0002-5972-0163","observed_orcids":["https://orcid.org/0000-0002-5972-0163"]},"institutions":[{"id":"https://openalex.org/I899646","display_name":"Punjab Agricultural University","ror":"https://ror.org/02qbzdk74","country_code":"IN","type":"education","lineage":["https://openalex.org/I899646"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Bijay Singh","raw_affiliation_strings":["Punjab Agricultural University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Punjab Agricultural University","institution_ids":["https://openalex.org/I899646"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5009986042","display_name":"Varinderpal Singh","orcid":"https://orcid.org/0000-0001-6900-7938","observed_orcids":["https://orcid.org/0000-0001-6900-7938"]},"institutions":[{"id":"https://openalex.org/I899646","display_name":"Punjab Agricultural University","ror":"https://ror.org/02qbzdk74","country_code":"IN","type":"education","lineage":["https://openalex.org/I899646"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Varinderpal Singh","raw_affiliation_strings":["Punjab Agricultural University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Punjab Agricultural University","institution_ids":["https://openalex.org/I899646"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5054109287","display_name":"Yadvinder Singh","orcid":"https://orcid.org/0000-0002-9321-0650","observed_orcids":["https://orcid.org/0000-0002-9321-0650"]},"institutions":[{"id":"https://openalex.org/I899646","display_name":"Punjab Agricultural University","ror":"https://ror.org/02qbzdk74","country_code":"IN","type":"education","lineage":["https://openalex.org/I899646"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Yadvinder Singh","raw_affiliation_strings":["Punjab Agricultural University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Punjab Agricultural University","institution_ids":["https://openalex.org/I899646"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5101675963","display_name":"Ajay Kumar","orcid":"https://orcid.org/0000-0002-7476-1609","observed_orcids":["https://orcid.org/0000-0002-7476-1609"]},"institutions":[{"id":"https://openalex.org/I899646","display_name":"Punjab Agricultural University","ror":"https://ror.org/02qbzdk74","country_code":"IN","type":"education","lineage":["https://openalex.org/I899646"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Ajay Kumar","raw_affiliation_strings":["Punjab Agricultural University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Punjab Agricultural University","institution_ids":["https://openalex.org/I899646"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5109878822","display_name":"Sandeep Sharma","orcid":"https://orcid.org/0000-0003-2110-4733","observed_orcids":["https://orcid.org/0000-0003-2110-4733"]},"institutions":[{"id":"https://openalex.org/I899646","display_name":"Punjab Agricultural University","ror":"https://ror.org/02qbzdk74","country_code":"IN","type":"education","lineage":["https://openalex.org/I899646"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Sandeep Sharma","raw_affiliation_strings":["Punjab Agricultural University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Punjab Agricultural University","institution_ids":["https://openalex.org/I899646"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5113808328","display_name":"Harmeet Singh Thind","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I899646","display_name":"Punjab Agricultural University","ror":"https://ror.org/02qbzdk74","country_code":"IN","type":"education","lineage":["https://openalex.org/I899646"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"H.S. Thind","raw_affiliation_strings":["Punjab Agricultural University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Punjab Agricultural University","institution_ids":["https://openalex.org/I899646"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5112753864","display_name":"O. P. Choudhary","orcid":"https://orcid.org/0000-0002-3861-3131","observed_orcids":["https://orcid.org/0000-0002-3861-3131"]},"institutions":[{"id":"https://openalex.org/I899646","display_name":"Punjab Agricultural University","ror":"https://ror.org/02qbzdk74","country_code":"IN","type":"education","lineage":["https://openalex.org/I899646"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"O.P. Choudhary","raw_affiliation_strings":["Punjab Agricultural University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Punjab Agricultural University","institution_ids":["https://openalex.org/I899646"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5087947407","display_name":"Monika Vashistha","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I899646","display_name":"Punjab Agricultural University","ror":"https://ror.org/02qbzdk74","country_code":"IN","type":"education","lineage":["https://openalex.org/I899646"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Monika Vashistha","raw_affiliation_strings":["Punjab Agricultural University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Punjab Agricultural University","institution_ids":["https://openalex.org/I899646"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I899646"],"apc_list":null,"apc_paid":null,"fwci":2.3481,"has_fulltext":false,"cited_by_count":17,"citation_normalized_percentile":{"value":0.87582167,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":88,"max":98},"biblio":{"volume":"66","issue":"1","first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12294","display_name":"Agricultural Science and Fertilization","score":0.9071999788284302,"subfield":{"id":"https://openalex.org/subfields/1111","display_name":"Soil Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},"topics":[{"id":"https://openalex.org/T12294","display_name":"Agricultural Science and Fertilization","score":0.9071999788284302,"subfield":{"id":"https://openalex.org/subfields/1111","display_name":"Soil Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T12310","display_name":"Crop Yield and Soil Fertility","score":0.03929999843239784,"subfield":{"id":"https://openalex.org/subfields/1102","display_name":"Agronomy and Crop Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T12045","display_name":"Rice Cultivation and Yield Improvement","score":0.03460000082850456,"subfield":{"id":"https://openalex.org/subfields/1110","display_name":"Plant Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/site-specific-nitrogen-management","display_name":"site-specific nitrogen management","score":0.7210000157356262},{"id":"https://openalex.org/keywords/irrigated-wheat","display_name":"irrigated wheat","score":0.9570000171661377},{"id":"https://openalex.org/keywords/chlorophyll-meter","display_name":"chlorophyll meter","score":0.8510000109672546},{"id":"https://openalex.org/keywords/nitrogen-use-efficiency","display_name":"nitrogen use efficiency","score":0.6740000247955322},{"id":"https://openalex.org/keywords/soil-nitrogen-availability","display_name":"soil nitrogen availability","score":0.746999979019165},{"id":"https://openalex.org/keywords/wheat-grain-yield","display_name":"wheat grain yield","score":0.5960000157356262},{"id":"https://openalex.org/keywords/northwest-india","display_name":"northwest India","score":0.8320000171661377}],"concepts":[{"id":"https://openalex.org/C168741863","wikidata":"https://www.wikidata.org/wiki/Q777671","display_name":"Sowing","level":2,"score":0.7826330661773682},{"id":"https://openalex.org/C2780560099","wikidata":"https://www.wikidata.org/wiki/Q83323","display_name":"Fertilizer","level":2,"score":0.7267160415649414},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.6227027177810669},{"id":"https://openalex.org/C137580998","wikidata":"https://www.wikidata.org/wiki/Q235352","display_name":"Crop","level":2,"score":0.5913838148117065},{"id":"https://openalex.org/C105462344","wikidata":"https://www.wikidata.org/wiki/Q17142554","display_name":"Nutrient management","level":3,"score":0.5872141718864441},{"id":"https://openalex.org/C6557445","wikidata":"https://www.wikidata.org/wiki/Q173113","display_name":"Agronomy","level":1,"score":0.5319958329200745},{"id":"https://openalex.org/C75639521","wikidata":"https://www.wikidata.org/wiki/Q1283519","display_name":"Field experiment","level":2,"score":0.515900731086731},{"id":"https://openalex.org/C2779014827","wikidata":"https://www.wikidata.org/wiki/Q1024207","display_name":"Non-invasive ventilation","level":3,"score":0.440481960773468},{"id":"https://openalex.org/C2776373379","wikidata":"https://www.wikidata.org/wiki/Q43177","display_name":"Chlorophyll","level":2,"score":0.4336961507797241},{"id":"https://openalex.org/C142796444","wikidata":"https://www.wikidata.org/wiki/Q181394","display_name":"Nutrient","level":2,"score":0.4248775243759155},{"id":"https://openalex.org/C140505726","wikidata":"https://www.wikidata.org/wiki/Q495304","display_name":"Forensic science","level":2,"score":0.3891313672065735},{"id":"https://openalex.org/C144027150","wikidata":"https://www.wikidata.org/wiki/Q48803","display_name":"Horticulture","level":1,"score":0.3035358190536499},{"id":"https://openalex.org/C42972112","wikidata":"https://www.wikidata.org/wiki/Q170201","display_name":"Veterinary medicine","level":1,"score":0.2734137177467346},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.2677013874053955},{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.12415698170661926},{"id":"https://openalex.org/C18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.5958/0974-0228.2018.00006.3","doi":"https://doi.org/10.5958/0974-0228.2018.00006.3","is_oa":true,"landing_page_url":"https://doi.org/10.5958/0974-0228.2018.00006.3","pdf_url":null,"source":{"id":"https://openalex.org/S2764398350","display_name":"Journal of the Indian Society of Soil Science","issn_l":"0019-638X","issn":["0019-638X","0974-0228"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":["poland-20","russia-white-list-3"],"host_organization":"https://openalex.org/P4320800641","host_organization_name":"Indian Society of Soil Science","host_organization_lineage":["https://openalex.org/P4320800641"],"host_organization_lineage_names":["Indian Society of Soil Science"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of the Indian Society of Soil Science","raw_type":"journal-article"}],"best_oa_location":{"id":"doi:10.5958/0974-0228.2018.00006.3","doi":"https://doi.org/10.5958/0974-0228.2018.00006.3","is_oa":true,"landing_page_url":"https://doi.org/10.5958/0974-0228.2018.00006.3","pdf_url":null,"source":{"id":"https://openalex.org/S2764398350","display_name":"Journal of the Indian Society of Soil Science","issn_l":"0019-638X","issn":["0019-638X","0974-0228"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":["poland-20","russia-white-list-3"],"host_organization":"https://openalex.org/P4320800641","host_organization_name":"Indian Society of Soil Science","host_organization_lineage":["https://openalex.org/P4320800641"],"host_organization_lineage_names":["Indian Society of Soil Science"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of the Indian Society of Soil Science","raw_type":"journal-article"},"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/2","score":0.991100013256073,"display_name":"Zero hunger"}],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":0,"referenced_works":[],"related_works":["https://openalex.org/W2590871025","https://openalex.org/W3019889251","https://openalex.org/W2054990385","https://openalex.org/W2056970635","https://openalex.org/W2785189874","https://openalex.org/W4385607963","https://openalex.org/W3003753466","https://openalex.org/W2409560356","https://openalex.org/W3088764333","https://openalex.org/W1579514191"],"abstract_inverted_index":{"In":[0],"irrigated":[1],"wheat":[2,38,93,250],"as":[3,34,53,129,139],"grown":[4],"in":[5,18,95,99,116,178],"north-western":[6,100],"India,":[7],"fertilizer":[8,65,123,133,155,259,264],"nitrogen":[9],"(N)":[10],"management":[11,29],"following":[12],"blanket":[13,256],"recommendations":[14],"is":[15],"increasing":[16],"resulting":[17],"stagnant":[19],"yield":[20],"levels":[21,105],"with":[22,79,91,255,262],"low":[23],"N":[24,33,58,66,134,156,174,213,219,232,265],"use":[25,202,266],"efficiency.":[26,267],"Site-specific":[27],"nutrient":[28],"strategy":[30],"to":[31,107,121,130,136,167,184,190,201,205,241],"apply":[32,122],"per":[35,140],"need":[36],"of":[37,56,88,118,142,169,173,193,210,227],"crop":[39,150],"was":[40,151,182,199],"formulated":[41],"based":[42],"on":[43],"leaf":[44,103,180,207,239],"colour":[45,181],"measured":[46],"by":[47,162],"chlorophyll":[48],"meter":[49,164,204],"(Minolta":[50],"SPAD":[51,61,108,163,203,246],"meter)":[52],"a":[54,86,170,225],"function":[55],"soil":[57],"supply.":[59],"The":[60],"meterguided":[62],"protocols":[63],"for":[64,258],"application":[67,168],"at":[68,175,195,215,221,234,253],"crown":[69],"root":[70],"initiation":[71],"(CRI)":[72],"and":[73,97,112,126,224],"maximum":[74],"tillering":[75],"(MT)":[76],"stages,":[77],"coinciding":[78],"first":[80],"two":[81],"irrigations,":[82],"were":[83,114],"evaluated":[84],"through":[85],"series":[87],"field":[89],"experiments":[90],"seven":[92],"varieties":[94],"Ludhiana":[96],"Gurdaspur":[98],"India.":[101],"Threshold":[102],"greenness":[104,240],"equivalent":[106],"readings":[109],"<40,":[110],"<42.5":[111],"<45":[113],"tested":[115],"terms":[117],"(i)":[119],"whether":[120],"or":[124,229,244],"not,":[125],"(ii)":[127],"deciding":[128],"how":[131],"much":[132],"needs":[135],"be":[137,160,185,242],"applied":[138],"requirement":[141],"the":[143,149,179],"crop.":[144],"At":[145],"CRI":[146,196,222],"stage,":[147],"when":[148],"about":[152],"two-week":[153],"old,":[154],"dose":[157,172,226],"could":[158],"not":[159],"guided":[161],"because":[165],"due":[166,189],"basal":[171],"planting":[176],"variation":[177],"found":[183],"very":[186],"small.":[187],"Also,":[188],"small":[191],"size":[192],"leaves":[194],"stage":[197,223,236],"it":[198],"difficult":[200],"measure":[206],"colour.":[208],"Application":[209],"30":[211,228],"kg":[212,218,231],"ha-1":[214,220,233],"planting,":[216],"45":[217,230],"MT":[235],"depending":[237],"upon":[238],"=":[243],"<":[245],"42.5,":[247],"respectively":[248],"produced":[249],"grain":[251],"yields":[252],"par":[254],"recommendation":[257],"N,":[260],"but":[261],"higher":[263]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":1},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":3},{"year":2021,"cited_by_count":8},{"year":2020,"cited_by_count":3}],"updated_date":"2026-09-25T08:18:29.962427","created_date":"2018-08-03T00:00:00"}