Nitrogen efficiency in wheat under rainfed Mediterranean conditions as affected by split nitrogen application |
| |
| Institution: | 1. Departamento de Ciencias y Recursos Agrícolas y Forestales, University of Córdoba, Campus de Rabanales, Edificio C-4 “Celestino Mutis”, Ctra. Madrid km 396, 14071 Córdoba, Spain;2. Departamento de Ciencias Agroforestales, University of Huelva, Spain;3. Laboratorio de Isótopos Estables, Autonomous University of Madrid, Spain;1. State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China;2. Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China;1. National Key Lab. of Crop Biology, Collaborative Innovation Team of Shandong Wheat–Corn Crops, Key Lab. of Crop Ecophysiology and Farming System, Ministry of Agriculture, Agronomy College of Shandong Agricultural University, Tai’an 271018, Shandong, PR China;2. Life Science and Technology College, Nanyang Normal University, Nanyang 473061, Henan, PR China;3. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, PR China;1. UMR211 Agronomie, INRA, AgroParisTech, Université Paris-Saclay, BP 01, 78850 Thiverval-Grignon, France;2. UMR1048 SAD-APT, INRA, AgroParisTech, Université Paris-Saclay, BP 01, 78850 Thiverval-Grignon, France;3. Arvalis-Institut-du-Végétal, Station expérimentale de la Jaillière, 44370 La Chapelle Saint-Sauveur, France;4. Arvalis-Institut-du-Végétal, 3 rue Joseph & Marie Hackin, 75116 Paris, France |
| |
| Abstract: | A 3-year field experiment in rainfed Vertisol was designed to study the effects of timing and splitting of N fertilizer on the efficiency of nitrogen in wheat (Triticum aestivum L.). A single rate of 150 kg N ha?1 was used, different fractions being applied at sowing, tillering and stem elongation. The experiment was designed as a randomized complete block with four blocks. At the same time, a 15N experiment was conducted within the main experiment area, with microplots, to quantify N uptake from fertilizer and soil. Mean wheat use of N fertilizer ranged from 14.1% when applied at sowing to 54.8% when applied as a top dressing at the beginning of stem elongation. The mean annual contribution of soil residual N and mineralization was 152 kg N ha?1, representing a considerable proportion of total wheat N uptake, ranging from 83.2% when N fertilizer was applied in the fall to 49.4% when it was applied at stem elongation. This would account for the poor and inconsistent response of grain yield and N efficiency indices, and for the importance of soil N in Vertisols for predicting wheat N fertilizer requirements, due to the carryover effect. Application of N fertilizer to wheat preferably as a top dressing, between tillering and stem elongation, is a strategy to be recommended from the standpoint both of the environment and of farmer returns. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
