N, P and K use efficiency and maize yield responses to fertilization modes and densities  

作　　者：LI Guang-hao CHENG Qian LI Long LU Da-lei LU Wei-ping 

机构地区：[1]Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Agricultural College,Yangzhou University/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops,Yangzhou 225009,P.R.China

出　　处：《Journal of Integrative Agriculture》2021年第1期78-86,共9页农业科学学报（英文版）

基　　金：the financial support of the National Key Research and Development Program of China (2016YFD0300109 and 2018YFD0200703);the National Natural Science Foundation of China (31771709);the Jiangsu Agricultural Industry Technology System of China (JATS[2019]458);the High-end Talent Support Program of Yangzhou University, China;the Priority Academic Program Development of Jiangsu Higher Education Institutions, China。

摘　　要：Optimal planting density and proper fertilization method are important factors to improve maize yield and nutrient utilization. A two-year(2016 and 2017) field experiment was conducted with three plant densities(6.0, 7.5 and 9.0 plants m^-2) and three fertilization modes(no fertilizer, 0 F;one-off application of slow-released fertilizer, SF;twice application of conventional fertilizer, CF). Results indicated that the grain yields and N, P and K use efficiencies under SF with the optimal planting density(7.5 plants m^-2) were the highest among all the treatments in 2016 and 2017. Compared with CF, SF could increase post-silking dry matter accumulation and promote N, P and K uptake at pre-and post-silking stages;this treatment increased grain N, P and K concentrations and resulted in high N, P and K use efficiencies. Nutrient(N, P and K) absorption efficiencies and partial productivity, and nutrient(N and P) recovery efficiency in SF treatment were significantly higher than those in CF treatments under the planting density of 7.5 plants m^-2. Under both SF and CF conditions, the grain yield, total N accumulation and nutrient use efficiencies initially increased, peaked at planting density of 7.5 plants m^-2, and then decreased with increasing plant density. Based on the yield and nutrient use efficiency in two years, plant density of 7.5 plants m^-2 with SF can improve both the grain yield and N, P and K use efficiency of spring maize in Jiangsu Province, China.

关 键 词：MAIZE grain yield slow-released fertilizer nutrient use efficiency planting density 

分 类 号：S513[农业科学—作物学]