Maize-soybean relay cropping increases soybean yield synergistically by extending the post-anthesis leaf stay-green period and accelerating grain filling

作     者：Yiling Li Ping Chen Zhidan Fu Kai Luo Ping Lin Chao Gao Shanshan Liu Tian Pu Taiwen Yong Wenyu Yang Yiling Li;Ping Chen;Zhidan Fu;Kai Luo;Ping Lin;Chao Gao;Shanshan Liu;Tian Pu;Taiwen Yong;Wenyu Yang

作者机构：College of AgronomySichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in SouthwestMinistry of Agriculture and Rural Affairs/Sichuan Engineering Research Center for Crop Strip Intercropping SystemChengdu 611130SichuanChina 

出 版 物：《The Crop Journal》 (作物学报（英文版）)

年 卷 期：2023年第11卷第6期

页      面：1921-1930页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：the Special Fund for the Industrial Technology System Construction of Modem Agriculture(CARS-04-PS20) the National Natural Science Foundation of China(31872856,31671625) the National Key Research and Development Program of China(2021YFF1000500) 

主　　题：Leaf stay-green Nitrogen reduction Maize-soybean relay cropping Yield 

摘      要：Relay cropping of Poaceae and Fabaceae promotes high yield and land-use efficiency by allowing a double ***,it is difficult to increase yield synergistically because of the reduced photosynthetic abilities of legume leaves under the shade of *** photosynthetic capacity in relay cropping systems is associated with ecological niche differentiation and photosynthetic compensation after restoration of normal *** conducted a field experiment in southwest China in 2020–2021 to evaluate the effects of three cropping patterns:maize–soybean relay cropping(IMS),monoculture maize(MM),and monoculture soybean(SS),and N application levels:no N application(NN:0 kg N ha^(−1)),reduced N(RN:180 kg N ha^(−1)),and conventional N(CN:240 kg N ha^(−1)).Compared to monocropping,relay cropping increased the stay-green traits of maize and soybean by 13%and 89%,*** cropping prolonged the leaf stay-green duration in the maize and soybean lag phase by almost 4 and 8 days,*** cropping maize(IM)increased the leaf area index(LAI)by 79.4%to 88.5%under NN and 55.5%to 148%under *** cropping soybean(IS)increased the LAI from 115%to 437%at days 40 to 50 after *** increased yield by 65.6%.IS increased yield by 9.7%.HI and system yield were at their highest values under *** the relay cropping system,reduced N application extended green leaf duration,increased photosynthesis inside the canopy at multiple levels,ultimately increases soybean yield synergistically.