Promotional effects of biochar and intercropping fresh peas on yield of maize with reduced application of nitrogen fertilizer
A split-zone experiment with main plot for maize intercropped with fresh peas ( M‖P ) and sole maize (SM),split plot for locally recommended N application amount ( N1,360 kg·hm-2 ),reduced 30% N ap-plication amount ( N2,250 kg·hm-2 ),and split plot for biochar application ( C) and no biochar application ( A) was conducted in 2022-2023 to investigate the effects of biochar and intercropping with fresh peas on photosynthetic sources,dry matter accumulation,and yield of maize.The results showed that intercropping fresh peas applied with biochar maintained greater LAI of maize with 30% reduced N application after 45～90 d of maize emergence,and which effectively decreased the decreasing of maize LAI after 90～150 d of maize emergence com-pared with the SMN1A,and significantly increased maize LAD throughout the whole growth period( P<0.05) .The dry matter accumulation and dry matter accumulation rate of maize with M‖PN2C treatment increased by 13.0% and 15.3%,respectively,after 60～90 d of maize emergence,and increased by 16.2% and 19.5% after 90～150 d of maize emergence compared with that of SMN1A treatment.Maize grain yield with M‖PN2C was significantly in-creased by 6.3% and 17.8%( P<0.05) compared with that of the M‖PN1A and SMN1A,respectively,and was not significantly different from that of M‖PN1C.1000-grain weight of intercropping maize increased by an average of 5.2% compared to sole cropping maize.In addition,the kernel number per spike and 1000-grain weight of maize were increased by applying biochar at 30% N reduction level compared to the local recommendation of applying N without biochar.The kernel number per spike and 1000-grain weight of intercropped maize applied with biochar was not different between N2 and N1.The results of the pathway analysis showed that intercropped fresh peas with biochar application enabled intercropped maize to achieve higher level of grain yield under nitrogen fertilizer reduction by in-creasing the 1000-grain weight of the maize.Therefore,the maize intercropped with fresh peas with reduced 30% nitro-gen and application with biochar treatment can be used as a reference model for nitrogen-saving and high-efficiency planting technology in arid oasis irrigation regions.
cereal-legume intercroppingbiocharnitrogen fertilizer reductionmaizeyieldcharacteristic of photosynthesis
万方数据
维普
