Effects Of Mulching Reflective Film And Row Spacing On The Yield And Light Utilization Of Summer Maize

The light condition is very important for the growth and development of maize,but in recent years,the light deficiency has become the main limiting factor affecting the production of maize.The density and row spacing configuration construct different canopy structures,in the case of high density,appropriate adjustment of row spacing can effectively improve the light in the canopy and the interior of the population,alleviate the influence of shading caused by high density,and lay a foundation for further improving the yield.During 2018-2019growing season,the experiments were carried out in the state key laboratory of crop biology and technical innovation center of maize in Huang-Huai-Hai region that the field experiment was conducted.Used ZD958 as the experimental material,and there are two different planting densities,which were 67500 plants·hm^-2and 82500 plants·hm^-2,and three row spacing forms（60 cm+60 cm,80 cm+40 cm,100 cm+20 cm）,and mulching reflective film and no mulching film treatment.In this experiment,the effects of mulching reflective film and row spacing on light energy utilization and yield of summer maize were studied,and the regulation mechanism of mulching reflective film and row spacing on improving summer maize yield and light temperature resource utilization efficiency was clarified,so as to solve the problem of insufficient light resources under high density of local maize and fully tap the potential of maize yield.The main research results are as follows:1 The effect of mulching reflective film and row spacing on summer Canopy structure maize yieldLAI and PAR capture ratio of mulching reflective film are higher than non-mulching reflective film.In 82500 plants·hm^-2density LAI and light interception rate were significantly higher than67500 plants·hm^-2density.At 67500 plants·hm^-2density,there was no significant difference between"60 cm+60 cm"and"80 cm+40 cm".At 82500 plants·hm^-2density,"80cm+40 cm"is significantly higher than other row spacing.Thus it can be seen that"80 cm+40cm"row spacing configuration combined with film mulching is more conducive to the expansion of leaf area under high density conditions and the improvement of canopy light interception rate,thus laying a foundation for increasing yield and stabilizing yield.2 The effect of mulching reflective film and row spacing on summer maize photosynthetic characteristicsPn、Fv/Fv、chlorophyll、PEPcase and Ru BPcase of mulching reflective film are higher than non-mulching reflective film.All the three row spacing configurations showed a significant decrease with the increase of planting density.At 67500 plants·hm^-2density,Pn、chlorophyll、PEPcase and Ru BPcase of"80 cm+40 cm"is significantly higher than other row spacing.At high density conditions,"80 cm+40 cm"row spacing are higher than"60 cm+60cm"and"100 cm+20 cm"row spacing.Thus,under high density,the"80 cm+40 cm"configuration treated with reflective film is more conducive to improving the photosynthetic characteristics of maize population.3 The effect of mulching reflective film and row spacing on summer maize dry matter accumulationThe dry matter accumulation increased rapidly with the growth period.Mulching reflective film are higher than non-mulching reflective film.The dry matter accumulation of summer maize under high density was significantly higher than that under normal density.Different row spacing configurations have different effects on dry matter accumulation.At67500 plants·hm^-2density,"60 cm+60 cm"is significantly higher than other row spacing.But as the planting density increases,Under the density of 82500 plants·hm^-2,the dry matter accumulation capacity of"80 cm+40 cm"treatment was the highest.Thus it can be seen that under high density,row spacing of"80 cm+40 cm"with mulching reflective film treatment is more conducive to dry matter accumulation of the population.4 The effect of mulching reflective film and row spacing on summer maize yieldAfter the addition of mulching reflective film,corn increases yield.Yields increased with planting density.At the same density,At 67500 plants·hm^-2density,there was no significant difference between"60 cm+60 cm"and"80 cm+40 cm".However,they are significantly higher than the"100 cm+20 cm"row spacing configuration.At high density,the yield of"80cm+40 cm"was higher than that of other row spacing configurations.It can be seen that under the density of 82500 plants·hm^-2,the row spacing of"80 cm+40 cm"after t mulching reflective film treatment is more conducive to the improvement of yield.Under the condition of this experiment,we believe that under the density condition of82500 plants·hm^-2,the optimal configuration of high and stable yield of summer maize is to adopt"80 cm+40 cm"row spacing arrangement,supplemented by mulching reflective film enhancement.