| Northern Anhui is prone to high temperatures,and high temperature stress has become one of the main limiting factors for summer corn in the northern Anhui region.In order to alleviate high temperature stress of summer corn,reduce the damage caused by high temperature stress,and increase the yield of summer corn in the north Anhui region.The experiment was carried out by irrigation and wide and narrow rows planting mode.In this study,Denghai 605 was used as the experimental material.The split zone design was adopted.The main zone was planting mode(P).The sub zone was irrigation(W).The main zone was set up with two planting mode,that was equal spacing(P1)and wide and narrow rows(P2).The line spacing of equal spacing was60 cm,and the wide line spacing was adopt 80 cm and that of narrow was 40 cm in wide and narrow planting mode.The sub-zone has two irrigation methods: 60mm(W60)and no irrigation(W0).The irrigation time is from the big trumpet stage(late July)the main results are as follows:(1)Compared with P1,P2 wide rows can significantly increase field wind speed and accelerate air flow.W60 can reduce soil and air temperature within group and leaf temperature,increase soil humidity and air humidity within group.P2W60 can effectively improve the field microclimate under high temperature.(2)Compared with W0,W60 can significantly increase the leaf area of summer corn,thereby increasing photosynthetic area.W60 significantly increases the chlorophyll content of summer corn,which in turn increased the actual electron yield,electron transfer rate,and photochemical quenching of the PSII system and reduced the non-photochemical quenching coefficient,thereby promoted stomatal conductance and transpiration rate,and ultimately increased net photosynthetic rate.P2W60 was more favourable to alleviate the damage of high temperature to summer corn photosynthesis system and improving the photosynthetic performance of summer corn.(3)The pollen volume of tassel florets in flowering stage of P2W60 maize was significantly higher than that of the other three treatments;the ear weight,ear diameter,number of ear rows and yield of P2W60 mature stage were also significantly higher than those of the other three treatments;The yield difference is not significant,but both are significantly higher than P1W0.The length of bald tip treated with P1W0 was significantly higher than that of the other three treatments.It can be seen that in high temperature weather,the wide-narrow row planting mode or irrigation significantly increased the yield of summer maize,but the wide-narrow row planting mode interacted with irrigation was the best.(4)Compared with P1W0,the plant height,ear height and stem diameter of the other three treatments did not reach significant levels,but P2W60 puncture strength,stalk crushing strength and ear position pull at flowering and milking stages were significant The average lodging level and lodging rate were significantly reduced;the stalk crushing strength and panicle pull of P1W60 and P2W0 were significantly higher than that of P1W0 at the milky stage,but the difference between the lodging indexes was not significant.It showed that the interaction of wide and narrow row planting mode and irrigation can improve the lodging resistance of maize plants during flowering and milking stages.In summary,under the high temperature environment,the interaction of wide and narrow row planting patterns and irrigation can effectively improve the microclimate in the field and alleviate the high temperature stress of summer maize;at the same time,increase the leaf area index and chlorophyll content of summer maize,significantly improve the The photosynthetic performance and anti-lodging ability promote the summer corn yield to increase significantly,suitable for popularization and implementation in the northern Anhui region. |
