Fertilizer-Induced Advances in Corn Growth Stage and Quantitative Definitions of Nitrogen Deficiencies

作     者：J. ZHANG A. M. BLACKMER P. M. KYVERYGA B. W. VAN DE WOESTYNE T. M. BLACKMER 

作者机构：Department of Agronomy Iowa State University Ames IA 50011 (USA) Iowa Soybean Association 4554 114th Street Urbandale IA 50322 (USA) John Deere Ag Management Solutions 140 114th Street Urbandale IA 50322 (USA) Statistieal Consulting Center 130 MM Wright State University Dayton OH 45435 (USA) 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2008年第18卷第1期

页      面：60-68页

核心收录：

学科分类：0818[工学-地质资源与地质工程] 09[农学] 0903[农学-农业资源与环境] 0901[农学-作物学] 

基　　金：Project supported by the Iowa Soybean Association USA through the ISA On-Farm Network~(TM) 

主　　题：chlorophyll corn fertilizer growth stage nitrogen deficiency 

摘      要：Evidence that nitrogen (N) fertilization tends to accelerate maturation as well as increase rates of growth has received little attention when diagnosing N deficiencies in corn (Zea mays L.).Such a tendency could be a potential source of errors when the diagnosis is solely based on comparing plants with different rates of *** N fertilization could accelerate rates of growth and maturation was tested in a field study with 12 paired plots representing relatively large variability in soil properties and landscape *** plots were located under conditions where preplant N fertilization reduced or avoided temporary N shortages for some plants but did not reduce for other plants early in the *** measured corn heights to the youngest leaf collar,stages of growth and chlorophyll meter readings (CMRs). The added N advanced growth stages as well as increased corn heights and CMRs at any given *** effects on corn heights,growth stages and ear weights were statistically significant (P0.05) despite substantial variability associated with *** in growth due to a temporary shortage of N within a growth stage might be partially offset by longer periods of growth within that stage to physiological *** shortages of N,therefore,may produce symptoms of N deficiency in situations where subsequent additions of N should not be expected to increase *** of these two somewhat different effects (i.e.,increase growth rates and advance growth stages) on corn growth could help to define N deficiency more precisely and to improve the accuracy of diagnosing N status in production agriculture.