Effects Of Cultivation Methods And Planting Density On Photosynthetic Performance And Grain Yield Of Maize In Cold Region

The main objective of the affect of cultivation methods for maize of cold regionpopulation characteristics and yield.The experiment was tested at the base of college ofagronomy at Heilongjiang Bayi Agriculture University between the year2012-2013, using theZhengdan958as test material,65cm small ridge and110cm wide ridge two rows withdifferent planting densities (6.0,7.5,9.0and10.5ten thousand·hm-2),65cm small ridge (onepoint one plant A; one point double plants B) and110cm wide ridge two rows (one line is onepoint one plant,another line is one point double plants C; two lines are one point double plantsD; two lines are one point one plant E) to study the yield population structure and functionalcharacteristics of maize and determine the Canopy structure and ear leaf chlorophyll content,soluble sugar content, net photosynthetic rate (Pn) of the dynamic changes at the silking ofmaize, and calculate the six major growth stages of leaf area index (LAI), photosyntheticpotential (LAD), net assimilation rate (NAR),The results as followed:1、Effects of planting methods and plant density on maize grain yield and its componentsAlso will increase with the increase of density, corn, high planting density (9.0tenthousand·hm-2) under the condition of mulching two lines are a big hole of plant cultivationway is more outstanding, when10.5ten thousand·hm-2density, five kinds of cultivation waysare began to decline, but the big ridge double line one point per plant, one behavior one holedouble plant cultivation method yield slightly higher than the other way.2、Effects of planting methods and plant density on maize ear leaf photosyntheticcharacteristicsThe chlorophyll content and net photosynthetic rate of ear corn plant leaf increased withplanting density decreased, there was no significant difference at the early stage of thefamily.Double ridges line behavior one point per plant, act one double strains and ridge indouble line one point per plant can maintain a higher photosynthetic rate after spinning.At thebeginning of the birth, the small ridge point per plant, double ridges line one point per plantbehavior, behavior one point double strains and the ridge in double line one point per plantchlorophyll content were higher, and enter the stage, double ridges line one point per plant leafis a green, significantly higher than that of double ridges line behavior one point per plant, act one point double strains.3、Effects of planting methods and plant density on maize Photosynthetic characteristicsCorn net photosynthetic rate with the increase of the population density and the decreasetrend.Ridge in double row behavior one point per plant, act one double strains and ridge indouble row one point per plant after spinning can maintain a higher photosynthetic rate, andsmall ridge a cavity per plant, small a hole double strains the ridge and the ridge in double rowone point pairs of plant photosynthetic rate is relatively low.Under the condition of differentdensity, double ridges line behavior one point per plant, act one double strains and ridge indouble line one point per plant leaf area index and photosynthetic potential is significantlyhigher than the other, on the contrary, a small ridge cave double strains of leaf area index in thewhole stages are smaller.4、Effects of planting methods and plant density on maize dry matter accumulationDry matter accumulation of maize population increases with the increase of populationdensity, change with the population structure, high density, the double ridges line one point perplant dry matter accumulation is higher than other cultivation way, especially in the laterspinning, double ridges line behavior one point per plant, act one point double strains.Grainfilling rate and grain dry matter accumulation was declined, with the increase of density are40d peak after spinning.Under the high density double ridges line one point per plant still cankeep high rate of grout.Above results show that different cultivation patterns and density on the photosyntheticcharacteristics and corn dry matter accumulation has a significant impact, in low density (6.0and7.5ten thousand·hm-2), the double ridges line behavior one point per plant, act one doublestrains and ridge in double row one point per plant yield obvious advantages, with the increaseof density, ridge in double row one point per plant in9.0ten thousand·hm-2density issignificantly higher than other cultivation way, in10.5ten thousand·hm-2density, thecultivation way production began to decline, and the ridge in double row behavior one pointper plant, act one point double slightly higher than the other strains cultivation method.