Optimal management of nitrogen fertilizer in the main rice crop and its carrying-over effect on ratoon rice under mechanized cultivation in Southeast China  

作　　者：HUANG Jin-wen WU Jia-yi CHEN Hong-fei ZHANG Zhi-xing FANG Chang-xun SHAO Cai-hong LIN Wei-wei WENG Pei-ying Muhammad Umar KHAN LIN Wen-xiong 

机构地区：[1]Key Laboratory for Genetics Breeding and Multiple Utilization of Crops,Ministry of Education/College of Agriculture,Fujian Agriculture and Forestry University,Fuzhou 350002,P.R.China [2]Key Laboratory of Crop Ecology and Molecular Physiology(Fujian Agriculture and Forestry University),Fujian Province University,Fuzhou 350002,P.R.China [3]Institute of Soil Fertilizer and Resources Environment,Jiangxi Academy of Agricultural Sciences,Nanchang 330200,P.R.China

出　　处：《Journal of Integrative Agriculture》2022年第2期351-364,共14页农业科学学报（英文版）

基　　金：funded by the National Key Research and Development Program of China(2016YFD0300508,2017YFD0301602 and 2018YFD0301105);the FujianTaiwan Joint Innovative Centre for Germplasm Resources and Cultivation of Crop,China(Fujian 2011 Program;2015-75);the Science and Technology Development Fund of Fujian Agriculture and Forestry University,China(KF2015043)。

摘　　要：This study attempted to clarify the carrying-over effect of different nitrogen treatments applied to the main crop on the crop population growth and yield formation of ratoon rice under mechanized cultivation in Southeast China.Based on the constant total nitrogen application amounts(225.00 kg ha;)in the main crop,an experiment with different ratios of basal and topdressing nitrogen fertilizer(the ratio of basal fertilizer:primary tillering fertilizer:secondary tillering fertilizer:booting fertilizer at 3:1:2:4(N1),3:2:1:4(N2),3:3:0:4(N3),and 4:3:0:3(N4),respectively,and a control without nitrogen treatment(N0))was set up across two consecutive years in field using hybrid rice variety Yongyou 1540 as the test materials.The results showed that the total tiller number and effective tillering percentage increased in the main crop under the N1 treatment,more nitrogen fertilizer applied in late growth stage of the main crop,and its effective tillering percentage of the main crop was the highest at up to 70.18%,which was 9.15%higher than that of conventional fertilization treatment(N4),more nitrogen fertilizer applied in early growth stage of the main crop.The same tendency was observed in leaf area index(LAI)value of the main crop and its subsequent ratoon rice,which were 16.52 and 29.87%higher,respectively,in the N1 treatment than that in the N4 treatment at the full heading stage.The same was true in the case of the transport rates of stem and sheath dry mater and the canopy light interception rates in both the main and its ratoon crops.The transport rate of stem and sheath in main crop rice under N1 treatment increased by 50.57%compared with N4 treatment.The canopy light interception rate of N1 treatment increased by 5.07%compared with N4 treatment at the full heading stage of the ratoon crop.Therefore,the total actual yield was the highest in the main and its ratoon crops under N1 treatment,averaging 17351.23 kg ha;in two-year trials,which was 23.00%higher than that in the conventional fertilization treatment(N4).

关 键 词：main crop ratoon rice nitrogen management crop stand low stubble height grain yield 

分 类 号：S511[农业科学—作物学]