| Density was one of the important agronomic measures,and also an effective means of population regulation.Previous carried out extensive research on quality,yield and quality of rice populations,basically defined the quality indicators of high yield and quality of planting density,but had little study about the effect of planting density on meteorological characteristics and meteorological indicators of high yield population.Indica general rice Ningjing 3 and high quality rice Nanjing 9108 as experimental materials in this paper to study the effects of different on population quality,yield,rice quality and meteorological characteristics in rice,focuses on the distribution variation of light intensity,temperature,humidity and CO2 concertation in different population,analyzing the relationship between meteorological characteristics,yield and quality,while discussing the configuration of meteorological characteritics for high yield and quality to provide a theoretical basis for a quantitative of population structure and quality indicators.This experiment mainly conclusion are as follows:1.The planting density had a significant influence on yield.In the range of density experiment,with increasing of planting density,yield increased first and then decreased.Yield of medium density of both ningjing3 and nanjing9108 were the highest,Ningjing3 was 9470.61 kg hm-2 and Nanjing9108 was 8866.01 kg·hm-2,with a significant difference;panicles per hectare of Ningjing3 first increased and then decreased,spikelets per panicle,seed setting rate and grain weight decreased with increasing of planting density.Panicles per hectare and seed setting rate of Nanjing9108 first increased and then decreased,spikelets per panicle was decreased,and grain weight did not change.2.The planting density had a significant impact on rice quality.Brown rice,chalky grain rate and chalkiness degree were increased,milled rice and head rice were decreased with density increasing,Two varieties were consistent.Amylose content of Ningjing3 was decreased,while Nanjing9108 showing no significant difference.albumin and srolamin of Ningjing3 first increased and then decreased,however,globulin and glutelin showing no significant difference;albumin and srolamin of Nanjing9108 decreased,globulin and glutelin showing no significant difference,too.3.The planting density had a significant impact on quantity and quality of population.In the range of density experiment,with increasing of planting density,number of tiller,leaf area and dry matter of single point were decreased significantly,while number of tiller,leaf area index,dry matter and dry matter accumulation after heading in population were first increased and then decreased.When planting density increased to middle level of 3 0cmx 10cm(3 3.3 × 104 hill·hm-2),the relationship between group and individual was coordination,and quantity and quality indicators in the population have reached the maximum.4.Effect of planting density on distribution of internal meteorological characteristics was significantly.With increasing of planting density,light intensity of different part in the population increased first and then decreased,light intensity of middle density was highest;different parts of temperature and relative humidity increased with plant density increased,while CO2 concentration decreased.5.Meteorological characteristics in heading time were closely to yield.When lower portion of the light intensity in heading time reached 30.65 to 35.93 ?mol·m-2·s-1,Ningjing3 had the highest yield,and reached 67.06 to 72.33 ?mol·m-2·s-1,Nanjing9108 had the highest yield.In terms of yield components,middle portion of temperature,humidity and CO2 contents had greater impact on seed setting rate and grain weight,when temperature reached 28.49 to 29.01 ?,humidity reached 63.09 to 66.14%,CO2 contents reached 359.77-364.28?mol·mol-1,Ningjing 3 and Nanjing9108 can get higher grain weight and seed setting rate.middle portion of temperature,humidity and lower portion of CO2 contents were closely to dry matter accumulation,when temperature reached 29.13 to 29.66?,humidity reached 66.93 to 67.91%,CO2 contents reached 348.26-354.42?mol·mol-1,Ningjing 3 and Nanjing9108 can get highest dry matter accumulation.6.Meteorological characteristics in heading time were closely to rice quality.Lower portion of CO2 contents was closely to brown rice and milled rice,when it reached 344.56-351.43 and 351.43-356.79 ?mol·mol-1,they can achieve higher brown rice and milled rice.Middle portion of temperature,humidity and CO2 contents were closely to chalky grain rate and chalkiness degree,when temperature reached 28.49 to 29.25 ?,humidity reached 63.09 to 66.82%,CO2 contents reached 359.77-364.28 ?mol·mol-1,chalky grain rate and chalkiness degree were lowest,that rice quality was the best. |
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