Analysis Of The Different Levels Of Rice Yields In Jilin Province Based On Population Structure

Based on the rice population structure,this study analyzes the differences in rice production levels in different rice areas in Jilin Province.Analyze the restrictive factors and the formation mechanism of the differences in rice production levels in different ecological regions of Jilin Province,and clearly identify ways to narrow down the differences in the production levels in the region and increase the potential for increasing rice yield.Jigeng 88 is the test material,it was conducted at the Meihekou Base?Black Soil Rice Area?of Tonghua Academy of Agricultural Sciences and the Rice Test Base?Soda Saline-alkali Rice Area?of Baicheng Academy of Agricultural Sciences from 2017 to 2019.Set four levels of cultivation management model:basic level?CK?,local farmer level?FY?,high yield and high efficiency level?HYHE?and super high yield level?SHY?,based on the group structure and micrometeorological factors within the group,the restrictive factors that analyze the differences in the production levels.The research results were as follows:1.The yields of CK,FY,HYHE and SHY in the black soil rice area has reached a significant level in three years,compared with HYHE,FY and CK,the yield of SHY has increased by an average of 22.41%,42.91%and 112.24%in three years,compared with FY and CK,the yield of HYHE was 1.44 t·hm^-2and 4.26 t·hm^-2on average in three years.The total dry matter accumulation was SHY>HYHE>FY>CK,and the difference between the treatments was significant,SHY was 45.66%?64.89%and 123.24%higher than HYHE,FY and CK on average in three years.HYHE was 2.03 t·hm^-2and 6.05 t·hm^-2higher than FY and CK on average in three years.The population growth rate,net assimilation rate,photosynthetic potential and leaf area decay rate of SHY and HYHE from the full heading stage to the filling stage were significantly higher than those of FY.Leaf area index and net photosynthetic rate showed SHY>HYHE>FY>CK,and SHY was significantly higher than the other three treatments.The light intensity,CO₂concentration and temperature of rice canopy at the full heading stage and 20 days after full heading stage showed that the upper part was significantly higher than the middle and lower parts,the light intensity within the group?middle and lower?was CK>FY>HYHE>SHY,the difference between SHY and other production levels has reached a significant level.The CO₂concentration in the middle and lower part of the SHY group was significantly lower than that of HYHE and FY;at the same time,HYHE was lower than FY,and the difference in CO₂concentration between HYHE and FY population levels has reached a significant level.The temperature of the middle and lower part of the population showed CK and FY>HYHE>SHY in the full heading stage and 20 days after the full heading stage,the temperature of the middle and lower parts of the SHY group was significantly lower than that of other treatments,while the temperature difference of the lower part of the HYHE and FY groups has reached a significant level.2.The yields of the soda saline-alkali rice area was SHY>HYHE>FY>CK,and the difference between the treatments was significant,compared with HYHE,FY and CK,the yield of SHY has increased by an average of 20.53%?33.15%and110.52%in three years,compared with FY and CK,the yield of HYHE was 0.96t·hm^-2and 4.33 t·hm^-2on average in three years.The total dry matter accumulation was significantly different among treatments,SHY was 42.99%?57.21%?170.09%higher than HYHE,FY and CK on average in three years.HYHE was 1.6 t·hm^-2and8.32 t·hm^-2higher than FY and CK on average in three years.The growth rate,net assimilation rate,photosynthetic potential and leaf area decay rate from the full heading stage to the filling stage showed that SHY and HYHE were significantly higher than FY.The leaf area index and net photosynthetic rate of SHY were significantly higher than those of the other three treatments,and the trend was SHY>HYHE>FY>CK.The light intensity,CO₂concentration and temperature in the upper part of the rice canopy were significantly higher than those in the middle and lower parts during the full heading stage and 20 days after full heading stage.The light intensity within the SHY group?middle and lower?and the rest of the treatment reached a significant level.The concentration of CO₂in the middle and lower part of the rice population shows that SHY was significantly lower than HYHE and FY,and HYHE was lower than FY,in the lower part of the population,the difference in CO₂concentration between HYHE and FY reached a significant level.The temperature of the middle and lower part of the SHY population was significantly lower than that of other treatments during the full heading stage and 20 days after the full heading stage,and the temperature of HYHE in the lower part of the population was significantly higher than FY.In summary,the dry matter accumulation,photosynthetic characteristics,and canopy structure of the two ecological regions were the factors that restricted crop yield.HYHE and SHY groups have higher total dry matter accumulation,reasonable population structure such as strong material production capacity and good canopy distribution were the basis of its high yield.Group growth rate,group net assimilation rate,photosynthetic potential,group net photosynthetic rate were low,insufficient leaf area index and low light interception within the group canopy were the restrictive factors for the low output of farmers in the rice area of Jilin Province.One of the key technical measures to reduce the differences in different yield levels of rice areas in Jilin Province was to optimize the management technology,build a reasonable population structure,increase the leaf area of the population,improve the production capacity of photosynthetic materials,and increase the interception of light energy in the population.