{"cited_by_count":464463,"description":"This cluster of papers explores various factors affecting maize yield, including nitrogen uptake, plant density, lodging resistance, hybrid selection, grain quality, stalk strength, source-sink relationship, genetic improvement, and crop management.","display_name":"Crop Yield and Soil Fertility","domain_id":"1","external_ids":{"openalex":"https://openalex.org/T12310","wikipedia":"https://en.wikipedia.org/wiki/Maize_production_in_the_United_States"},"field_id":"11","id":"T12310","keywords":[{"display_name":"maize hybrids","id":"maize-hybrids","score":0.4225,"url":"https://openalex.org/keywords/maize-hybrids"},{"display_name":"maize varieties","id":"maize-varieties","score":0.3586,"url":"https://openalex.org/keywords/maize-varieties"},{"display_name":"maize breeding","id":"maize-breeding","score":0.2771,"url":"https://openalex.org/keywords/maize-breeding"},{"display_name":"forage maize","id":"forage-maize","score":0.3242,"url":"https://openalex.org/keywords/forage-maize"},{"display_name":"summer maize","id":"summer-maize","score":0.2702,"url":"https://openalex.org/keywords/summer-maize"},{"display_name":"ear length","id":"ear-length","score":0.2567,"url":"https://openalex.org/keywords/ear-length"},{"display_name":"nitrogen application timing","id":"nitrogen-application-timing","score":0.2376,"url":"https://openalex.org/keywords/nitrogen-application-timing"},{"display_name":"split nitrogen application","id":"split-nitrogen-application","score":0.2105,"url":"https://openalex.org/keywords/split-nitrogen-application"},{"display_name":"ear weight","id":"ear-weight","score":0.3325,"url":"https://openalex.org/keywords/ear-weight"},{"display_name":"spring maize","id":"spring-maize","score":0.3152,"url":"https://openalex.org/keywords/spring-maize"},{"display_name":"grain number","id":"grain-number","score":0.2103,"url":"https://openalex.org/keywords/grain-number"},{"display_name":"grain nitrogen content","id":"grain-nitrogen-concentration","score":0.2728,"url":"https://openalex.org/keywords/grain-nitrogen-concentration"},{"display_name":"single-cross hybrids","id":"single-cross-hybrids","score":0.2671,"url":"https://openalex.org/keywords/single-cross-hybrids"},{"display_name":"ear height","id":"ear-height","score":0.2501,"url":"https://openalex.org/keywords/ear-height"},{"display_name":"ear number","id":"ear-number","score":0.3781,"url":"https://openalex.org/keywords/ear-number"},{"display_name":"grain number per ear","id":"grain-number-per-ear","score":0.3347,"url":"https://openalex.org/keywords/grain-number-per-ear"},{"display_name":"ear diameter","id":"ear-diameter","score":0.3584,"url":"https://openalex.org/keywords/ear-diameter"},{"display_name":"maize genotypes","id":"maize-genotypes","score":0.2059,"url":"https://openalex.org/keywords/maize-genotypes"},{"display_name":"Zhengdan 958","id":"zhengdan-958","score":0.5313,"url":"https://openalex.org/keywords/zhengdan-958"},{"display_name":"baby corn","id":"baby-corn","score":0.308,"url":"https://openalex.org/keywords/baby-corn"},{"display_name":"ear traits","id":"ear-traits","score":0.3082,"url":"https://openalex.org/keywords/ear-traits"},{"display_name":"silking","id":"silking","score":0.6009,"url":"https://openalex.org/keywords/silking"},{"display_name":"cob weight","id":"cob-weight","score":0.311,"url":"https://openalex.org/keywords/cob-weight"},{"display_name":"irrigated maize","id":"irrigated-maize","score":0.3154,"url":"https://openalex.org/keywords/irrigated-maize"},{"display_name":"second crop","id":"second-crop","score":0.2065,"url":"https://openalex.org/keywords/second-crop"}],"legacy_keywords":["Maize Yield","Nitrogen Uptake","Plant Density","Lodging Resistance","Hybrid Selection","Grain Quality","Stalk Strength","Source-Sink Relationship","Genetic Improvement","Crop Management"],"openalex_id":"https://openalex.org/T12310","source_created_date":"2024-01-23T15:27:13","source_updated_date":"2026-10-17T03:02:00","subfield_id":"1102","url":"/topics/T12310","works_api_url":"https://api.openalex.org/works?filter=topics.id:T12310","works_count":70683,"label":"Crop Yield and Soil Fertility","provider":"openalex","revision":"56789c5bbc18e9be","taxonomy_revision":"f050b5d4780b1289","title":"Crop Yield and Soil Fertility","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"38284994946821347","address_version":"morton4x16-v1","coordinates":[1,11,1102,12310],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}