Amos B, Walters D T. 2006. Maize root biomass and net rhizodeposited carbon. Soil Science Society of America Journal, 70, 1489–1503.

Anderson E L. 1988. Tillage and N fertilization effects on maize root growth and root:shoot ratio. Plant and Soil, 108, 245–251.

Andrews M. 1986. The partitioning of nitrate assimilation between root and shoot of higher plants. Plant Cell and Environment, 9, 511–519.

Aslam M, Travis R L, Rains D W. 2001. Enhancement of nitrate reductase activity and metabolic nitrate concentration by methionine sulfoximine in barley roots. Plant Science, 161, 133–142.

Berenguer P F, Santiveri J, Boixadera L J. 2009. Nitrogen fertilisation of irrigated maize under Mediterranean conditions. European Journal of Agronomy, 30, 163–171.

Bremner J M, Tabatabai M A. 1972. Use of an ammonia electrode for determination of ammonium in Kjeldahl analysis of soils. Communications in Soil Science and Plant Analysis, 3, 159–165.

Cassman K G, Dobermann A, Walters D T, Yang H. 2003. Meeting cereal demand while protecting natural resources and improving environmental quality. Annual Review of Environment and Resources, 28, 315–358.

Chen Y L, Xiao C X, Wu D L, Xia T T, Chen Q W, Chen F J, Mi G H. 2015a. Effects of nitrogen application rate on grain yield and grain nitrogen concentration in two maize hybrids with contrasting nitrogen remobilization efficiency. European Journal of Agronomy, 62, 79–89.

Chen Y L, Zhang J, Li Q, He X L, Su X P, Chen F J, Yuan L X, Mi G H. 2015b. Effects of nitrogen application on post-silking root senescence and yield of maize. Agronomy Journal, 107, 835–842.

Chen Z, Ren W, Yi X, Li Q, Cai H G, Ali F H, Yuan L X, Mi G H, Chen F J. 2023. Local nitrogen application increases maize post-silking nitrogen uptake of responsive genotypes via enhanced deep root growth. Journal of Integrative Agriculture, 22, 235–250.

Chun L, Chen F J, Zhang F S, Mi G H. 2005. Root growth, nitrogen uptake and yield formation of hybrid maize with different N efficiency. Plant Nutrition and Fertitizer Science, 11, 615–619.

Ciampitti I A, Vyn T J. 2011. A comprehensive study of plant density consequences on nitrogen uptake dynamics of maize plants from vegetative to reproductive stages. Field Crops Research, 121, 2–18.

Ciampitti I A, Vyn T J. 2012. Physiological perspectives of changes over time in maize yield dependency on nitrogen uptake and associated nitrogen efficiencies: A review. Field Crops Research, 133, 48–67.

DaSilva P, Strieder M L, Coser R, Rambo L, Sangoi L, Argenta G, Forsthofer E L. DaSilva A A. 2005. Grain yield and kernel crude protein content increases of maize hybrids with late nitrogen side-dressing. Scientia Agricola, 62, 487–492.

Dobermann A, Cassman K G. 2004. Environmental dimensions of fertilizer N: What can be done to increase nitrogen use efficiency and ensure global food security? In: Mosier A R, Syers J K, Freney J R, et al. eds., Agriculture and the Nitrogen Cycle: Assessing the Impacts of Fertilizer Use on Food Production and the Environment. SCOPE 65. Island Press, Washington, D.C., USA. pp. 261–278.

Duncan D R, Widholm J M. 2004. Osmotic induced stimulation of the reduction of the viability dye 2,3,5-triphenyltetrazolium chloride by maize roots and callus cultures. Journal of Plant Physiology, 161, 397–403.

Durieux R P, Kamprath E J, Jackson W A, Moll R H. 1994. Root distribution of corn: The effect of nitrogen fertilization. Agronomy Journal, 86, 958–962.

Eghball B, Maranville J W. 1993. Root development and nitrogen influx of corn genotypes grown under combined drought and N stress. Agronomy Journal, 85, 147–152.

Eichelberger K D, Lambert R J, Below F E, Hageman R H. 1989b. Divergent phenotypic recurrent selection for nitrate reductase activity in maize. II. Efficient use of fertilizer nitrogen. Crop Science, 29, 1398–1402.

Feng G, Zhang Y, Chen Y, Li Q, Chen F, Gao Q, Mi G. 2016. Effects of nitrogen application on root length and grain yield of rain-fed maize under different soil type. Agronomy Journal, 108, 1656–1665.

Gao Q, Feng G Z, Wang Z G. 2010. Present situation of fertilizer application on spring maize in Northeast China. Chinese Agricultural Science Bulletin, 26, 229–231. (in Chinese)

Garnett T, Conn V, Kaiser B N. 2009. Root based approaches to improving nitrogen use efficiency in plants. Plant Cell and Environment, 32, 1272–1283.

Guana D H, Mahdi M A, Zhang Y S, Duana LS, Tana W M, Mingcai M G, Zhao H Li. 2014. Tillage practices affect biomass and grain yield through regulating root growth, root-bleeding sap and nutrients uptake in summer maize. Field Crops Research, 157, 89–97.

Hammer G L, Dong Z S, Greg M, Doherty A, Carlos M, Jeff S, Zinselmeier C, Paszkiewica S, Cooper M. 2009. Can changes in canopy and/or root system architecture explain historical maize yield trends in the U.S. Corn Belt? Crop Science, 49, 299–312.

Herder G D, Isterdael G N, Beeckman T, Smet I D. 2010. The roots of a new green revolution. Trends in Plant Science, 15, 600–607.

Jia X C,Wu G J, Strock C, Li L, Dong S T, Zhang J W, Zhao B, Lynch G P, Liu P. 2022. Root anatomical phenotypes related to growth under low nitrogen availability in maize (Zea mays L.) hybrids. Plant and Soil, 477, 843–844.

Ju C X, Buresh R J, Wang Z Q, Zhang H, Liu L J, Yang J C, Zhang J H. 2015. Root and shoot traits for rice varieties with higher grain yield and higher nitrogen use efficiency at lower nitrogen rates application. Field Crops Research, 175, 47–55.

Kichey T, Heumez E, Pocholle D, Pageau K, Vanacker H, Dubois F, Le Gouis J, Hirel B. 2006. Combined agronomic and physiological aspects of nitrogen management in wheat highlight a central role for glutamine synthetase. New Phytologist, 169, 265–278.

Ladha J K, Pathak H J. Krupnik T, Six J, van Kessel C. 2005. Efficiency of fertilizer nitrogen in cereal production: Retrospects and prospects. Advances in Agronomy, 87, 85–156.

Lam H M, Coschigano K T, Oliveira I C, Melo-Oliveira R, Coruzzi G M. 1996. The molecular-genetics of nitrogen assimilation into amino acids in higher plants. Annual Review of Plant Physiology and Plant Molecular Biology, 47, 569–593.

Li X L, Wang R, Zhou B Y, Wang X B, Wang J, Zhao M, Li C F. 2022. Characterization of root morphology and anatomical structure of spring maize under varying N application rates and their effects on yield. Agronomy Basel, 12, 2671.

Liu J L, Zhan A, Bu L D, Zhu L, Luo S S, Chen X P, Gui Z L, Li S Q, Hill R L, Zhao Y. 2014. Understanding dry matter and nitrogen accumulation for high-yielding film-mulched maize. Agronomy Journal, 106, 390.

Liu J X, Chen F J, Olokhnuud C L, Glass A D M, Tong Y P, Zhang F S, Mi G H. 2009. Root size and nitrogen-uptake activity in two maize (Zea mays) inbred lines differing in nitrogen-use efficiency. Journal of Plant Nutrition and Soil Science, 17, 230–236.

Liu Y, Pan X, Li J. 2015. A 1961–2010 record of fertilizer use, pesticide application and cereal yields: A review. Agronomy for Sustainable Development, 35, 83–93.

Lynch J P. 2013. Steep, cheap and deep: An ideotype to optimize water and N acquisition by maize root systems. Annals of Botany, 112, 347–357.

Marschner H. 1998. Role of root growth, arbuscular mycorrhiza, and root exudates for the efficiency in nutrient acquisition. Field Crops Research, 56, 203–207.

Mi G H, Chen F J, Wu Q P, Lai N W, Yuan L X, Zhang F S. 2010. Ideotype root architecture for efficient nitrogen acquisition by maize in intensive cropping systems. Science China (Life Sciences), 53, 1369–1373.

Mi G H, Liu J A, Chen F J, Zhang F S, Cui Z L, Liu X S. 2003. Nitrogen uptake and remobilization in maize hybrids differing in leaf senescence. Journal of Soil Science and Plant Nutrition, 26, 237–247.

Moll R H, Kamprath E J, Jackson W A. 1982. Analysis and interpretation of factors which contribute to efficiency of nitrogen utilization. Agronomy Journal, 74, 562.

Mu X H, Chen F J, Wu Q P, Chen Q W, Wang J F, Yuan L X, Mi G H. 2015. Genetic improvement of root growth increases maize yield via enhanced post-silking nitrogen uptake. European Journal of Agronomy, 63, 55–61.

Niu J F, Peng Y F, Li C J, Zhang F S. 2010. Changes in root length at the reproductive stage of maize plants grown in the field and quartz sand. Journal of Soil Science and Plant Nutrition, 173, 306–314.

Ogle K, Wolpert R L, Reynolds J F. 2004. Reconstructing plant root area and water uptake profiles. Ecology, 85, 1967–1978.

Oikeh S O, Kling J G, Horst W J, Chude V O, Carsky R J. 1999. Growth and distribution of maize roots under nitrogen fertilization in plinthite soil. Field Crops Research, 62, 1–13.

Ordóñez R A, Castellano M J, Danalatos G N, Wright E E, Hatfield J L, Burras L, Archontoulis S V. 2021. Insufficient and excessive N fertilizer input reduces maize root mass across soil types. Field Crops Research, 267, 108142.

Palansooriya K N, Ok Y S, Awad Y M, Lee S S, Sung J K, Koutsospyros A, Moon D H. 2019. Impacts of biochar application on upland agriculture: A review. Journal of Environmental Management, 234, 52–64.

Passioura J B.1983. Roots and drought resistance. Agricultural Water Management, 7, 265–280.

Peng Y F, Niu J F, Peng Z P, Zhang F S, Li C J. 2010. Shoot growth potential drives N uptake in maize plants and correlates with root growth in the soil. Field Crops Research, 115, 85–93.

Peuke A D. 2000. The chemical composition of xylem sap Invitis vinifera L. cv., riesling during vegetative vineyard soils and as influenced by nitrogen fertilizer. American Journal of Enology and Viticulture, 51, 329–339.

Quaggiotti S, Trentin A R, Dalla Vecchia F, Ghisi R. 2004. Response of maize (Zea mays L.) nitrate reductase to UV-B radiation. Plant Science, 167, 107–116.

Rais I, Masood A, Inam A, Khan N. 2013. Sulfur and nitrogen coordinately improve photosynthetic efficiency, growth and proline accumulation in two cultivars of mustard under salt stress. Journal of Plant Biochemistry & Physiology, 1, 1000101.

Raun W R, Johnson G V. 1999. Improving nitrogen use efficiency for cereal production. Agronomy Journal, 91, 357–363.

Saengwilai P, Nord E A, Chimungu J G, Brow K M, Lynch J P. 2014. Root Cortical aerenchyma enhances nitrogen acquisition from low-nitrogen soils in maize. Plant Physiology, 166, 726–735.

Saiz-Fernández I, De Diego N, Brzobohatý B, Muñoz-Rueda A, Lacuesta M. 2017. The imbalance between C and N metabolism during high nitrate supply inhibits photosynthesis and overall growth in maize (Zea mays L.). Plant Physiology and Biochemistry, 120, 213–222.

Salvagiotti F, Castellarin J M, Miralles D J, Pedrol H M. 2009. Sulfur fertilization improves nitrogen use efficiency in wheat by increasing nitrogen uptake. Field Crops Research, 113, 170–177.

Sánchez E, Rivero R M, Ruiz J M, Romero L. 2004. Changes in biomass, enzymatic activity and protein concentration in roots and leaves of green bean plants (Phaseolus vulgaris L. cv. Strike) under high NH4NO3 application rates. Scienta Horticultrae, 9, 237–248.

Schneider H M, Lynch J P. 2021. Root traits for improving N acquisition efficiency. In: Ricroch A, Chopra S, Kuntz M, eds., Plant Biotechnology: Experience and Future Prospects. Springer International Publishing, Cham. pp. 163–180.

SGAC (State Grain Administration of China). 2017. China Grain Yearbook. China Social Press, Beijing. (in Chinese)

Sha X Q, Guan H H, Zhou Y Q, Su E H, Guo J, Li Y X, Zhang D F, Liu X Y, He G H, Li Y, Wang T Y, Zou H W, Li C H. 2023. Genetic dissection of crown root traits and their relationships with aboveground agronomic traits in maize. Journal of Integrative Agriculture, 22, 3394–3407.

Shao H, Shi D F, Shi W J, Ban X B, Chen Y C, Ren W, Chen F J, Mi G H. 2019. Genotypic difference in the plasticity of root system architecture of field-grown maize in response to plant density. Plant and Soil, 439, 201–217.

Shao Z Q, Zheng C C, Johannes A P, Lu W L, Gao Q, Gao Y Z, Zhang J J. 2021. Nitrogen acquisition, fixation and transfer in maize/alfalfa intercrops are increased through root contact and morphological responses to interspecies competition. Journal of Integrative Agriculture, 20, 2240–2254.

Uribelarrea M, Moose S P, Below F E. 2007. Divergent selection for grain protein affects nitrogen use efficiency in maize hybrids. Field Crops Research, 100, 82–90.

Waines J G, Ehdaie B. 2007. Domestication and crop physiology: Roots of green-revolution wheat. Annals of Botany, 100, 991–998.

Wang G Y, Zhang Y T, Chen A Q, Liu H B, Zhai L M, Lei B K, Ren T Z. 2017. An optimal regional nitrogen application thresh old for wheat in the North China Plain considering yield and environmental effects. Field Crops Research, 207, 52–61.

Wang X, Feng J, White P J, Shen J, Chen L. 2020. Heterogeneous phosphate supply influences maize lateral root proliferation by regulating auxin redistribution. Annals of Botany, 125, 119–130.

Wang Y, Mi G H, Chen F J, Zhang J H, Zhang F S. 2004. Response of root morphology to nitrate supply and its contribution to nitrogen accumulation in maize. Journal of Soil Science and Plant Nutrition, 27, 2189–2202.

Wang Y, Zhang X, Chen J, Chen A, Wang L, Guo X, Niu Y, Liu S, Mi G, Gao Q. 2019. Reducing basal nitrogen rate to improve maize seedling growth, water and nitrogen use efficiencies under drought stress by optimizing root morphology and distribution. Agricultural Water Management, 212, 328–337.

Wei H Y, Hu L, Zhu Y, Xu D, Zheng L M, Chen Z F, Hu Y J, Cui P Y, Guo B W, Dai Q G, Zhang H C. 2018. Different characteristics of nutrient absorption and utilization between inbred japonica super rice and inter-sub-specific hybrid super rice. Field Crops Research, 218, 88–96.

Wu L, Mcgechan M B, Watson C A, Baddeley J A. 2005. Developing existing plant root system architecture models to meet future agricultural challenges. Advances in Agronomy, 85, 181–219.

Xu G, Lu D K, Wang H Z, Li Y. 2018. Morphological and physiological traits of rice roots and their relationships to yield and nitrogen utilization as influenced by irrigation regime and nitrogen rate. Agricultural Water Management, 203, 385–394.

Yang C M, Yang L Z, Yang Y X, Ouyang Z. 2004. Rice root growth and nutrient uptake as influenced by organic manure in continuously and alternately flooded paddy soils. Agricultural Water Management, 70, 67–81.

Yang L X, Wang Y L, Kobayashi K Z, Zhu J G, Huang J N, Yang H G, Wang Y X Dong, G C, Liu G, Han Y, Shan Y H, Hu J, Zhou J A. 2008. Seasonal changes in the effects of free-air CO2 enrichment (FACE) on growth, morphology and physiology of rice root at three levels of nitrogen fertilization. Global Change Biology, 14, 1–10.

Yu H L, Gao Q, Shao Z Q, Ying A N, Sun Y Y, Liu J W, Mao W, Zhang B. 2016. Decreasing nitrogen fertilizer input had little effect on microbial communities in three types of soils. PLoS ONE, 11, e0151622.

Yu P, White P J, Hochholdinger F, Li C J. 2014. Phenotypic plasticity of the maize root system in response to heterogeneous nitrogen availability. Planta, 240, 667–678.

Zeng J, Liu X, Song L, Lin X, Zhang H, Shen C, Chu H. 2016. Nitrogen fertilization directly affects soil bacterial diversity and indirectly affects bacterial community composition. Soil Biology & Biochemistry, 92, 41–49.

Zhang H, Zhang J H, Yang J C. 2023. Improving nitrogen use efficiency of rice crop through an optimized root system and agronomic practices. Crop and Environment, 2, 192–201.

Zhang H, Zhang S F, Yang J C, Zhang J H, Wang Z Q. 2008. Postanthesis moderate wetting drying improves both quality and quantity of rice yield. Agronomy Journal, 100, 726–734.

Zhang G Q, Liu C W, Xiao C H, Xie R Z, Ming B, Hou P, Liu G Z, Xu W J, Shen D P, Wang K R, Li S K. 2017. Optimizing water use efficiency and economic return of super high yield spring maize under drip irrigation and plastic mulching in arid areas of China. Field Crops Research, 211, 137–146.

Zhang J H, Sui X Z, Li B, Su B L, Li J M, Zhou D X. 1998. An improved water-use efficiency for winter wheat grown under reduced irrigation. Field Crops Research, 59, 91–98.

Zheng C Y, Li C L, Tian L B, Shen Z Y, Feng G Z, Hou W F, Liu F L, Gao Q, Wang Y. 2023. Mixture of controlled-release and normal urea to improve maize root development, post-silking plant growth, and grain filling. European Journal of Agronomy, 151, 126994.

Zhu K Y, Yan J Q, Shen Y, Zhang W Y, Xu Y J, Wang Z Q, Yang J C. 2022. Deciphering the morpho-physiological traits for high yield potential in nitrogen efficient varieties (NEVs): A japonica rice case study. Journal of Integrative Agriculture, 21, 947–963.