[Objective] This study aimed at investigating the effect of chemical regulation on maize cultivated in different densities.[Method] By taking maize hybrids Xundan 20 and Zhongnongda 4 as materials,the effect of chemic...[Objective] This study aimed at investigating the effect of chemical regulation on maize cultivated in different densities.[Method] By taking maize hybrids Xundan 20 and Zhongnongda 4 as materials,the effect of chemical regulation on the yield,yield component factors and plant morphology of the two hybrids planting in Northern and Northeastern China were studied,respectively.[Result] Chemical Yuhuangjin could control maize stalks,lower the plant height and the ear height,make internodes below the spike more coarse and enhance its lodging-resistance.In addition,chemical regulation could increase the optimum cultivation density by 7 500 plants/hm2 more than traditional cultivation.[Conclusion] This paper provided theoretical reference for cultivating high-yield maize.展开更多
[Objective] The experiment was conducted to explore the suitable planting density and nitrogen amount for summer maize in Sichuan Basin with the objective to provide technical reservation and scientific basis for high...[Objective] The experiment was conducted to explore the suitable planting density and nitrogen amount for summer maize in Sichuan Basin with the objective to provide technical reservation and scientific basis for high-yielding cultivation technique.[Method] A widely planted maize cultivar ＇Chengdan 30＇ was used as experimental material to study the effects of planting density and nitrogen amount on the stalk agronomic traits,stalk lodging-resistance mechanical characters,stalk breaking percentage and yield of maize.Experiment was arranged in a two-factor split plot design with three replicates.The planting density was the main factor with three density gradients（4.5×10^4,6.0×10^4 and 7.5×10^4 plants/hm^2） and the nitrogen amount was the second factor with two different levels of nitrogen content（300 and 375 kg/hm^2）.[Result] The stalk lodging-resistance and yield were affected by planting density significantly.The increase of planting density would result in an increase of internode length and decrease of internode diameter,dry matter weight of per unit stalk length,rind penetration strength and breaking resistance of 3rd and 4th basal internodes.When planting density increased from 6.0×10^4 plants/hm2 to 7.5×10^4 plants/hm^2,the stalk breaking percentage in the whole growing season increased by 17.17%,and the yield reduced by 17.58%.The interaction between planting density and nitrogen amount affected the stalk breaking percentage in the whole growing season and yield significantly.The treatment with planting density of 6.0×104 plants/hm^2 and nitrogen amount of 375 kg/hm^2 of pure N was an optimal combination,which may not only control the stalk breaking percentage of whole growing stage effectively,but also could obtain an optimum grain yield.[Conclusion] In Sichuan Basin,the appropriate planting density and nitrogen amount for summer maize were 6.0×10^4 plants/hm^2 and 375 kg/hm^2.展开更多
In order to investigate the most suitable sowing period and the optimum planting density of new com variety ‘Yudan 30＇ In Chongqing region, using split plot experiment design, the effect of sowing date and planting ...In order to investigate the most suitable sowing period and the optimum planting density of new com variety ‘Yudan 30＇ In Chongqing region, using split plot experiment design, the effect of sowing date and planting density on main a- gronomic characters and yield of maize in the field was studied. The results showed that in Chongqing, the delay of sowing date could shorten the fertility peri- od, and reduce 100-grain Weight and yield, but could increase plant height and ear height, panicle traits did not change significantly. With the density increasing, plant height and ear height also increased, while ear length, ear diameter, stem diameter, row number and kernel number also decreased. 100-grain weight and yield also in- creased with the increase of density, but to a certain threshold, yield and 100-grain weight decreased with the increase of density. The yield of 3 sowing periods pre- sented as AI〉A2〉A3, the yield of 4 kinds of density presented as B3〉EH〉B2〉B1, and the yield under sowing time and density interaction presented as AIB3〉A1B4〉 A2.B3〉A2.B4〉A3B3〉 A3B4〉A2.B2〉A1BI〉A2BI〉A3BI. So proper eady sowing and increase of planting density could raise the yield of maize per unit area, and AIB3 was the optimum planting configuration in Chongqing area.展开更多
文摘[Objective] This study aimed at investigating the effect of chemical regulation on maize cultivated in different densities.[Method] By taking maize hybrids Xundan 20 and Zhongnongda 4 as materials,the effect of chemical regulation on the yield,yield component factors and plant morphology of the two hybrids planting in Northern and Northeastern China were studied,respectively.[Result] Chemical Yuhuangjin could control maize stalks,lower the plant height and the ear height,make internodes below the spike more coarse and enhance its lodging-resistance.In addition,chemical regulation could increase the optimum cultivation density by 7 500 plants/hm2 more than traditional cultivation.[Conclusion] This paper provided theoretical reference for cultivating high-yield maize.
基金Supported by the Special Fund for Agricultural and Rural Research in the Public Interest of Sichuan Province(12ZC1930)~~
文摘[Objective] The experiment was conducted to explore the suitable planting density and nitrogen amount for summer maize in Sichuan Basin with the objective to provide technical reservation and scientific basis for high-yielding cultivation technique.[Method] A widely planted maize cultivar ＇Chengdan 30＇ was used as experimental material to study the effects of planting density and nitrogen amount on the stalk agronomic traits,stalk lodging-resistance mechanical characters,stalk breaking percentage and yield of maize.Experiment was arranged in a two-factor split plot design with three replicates.The planting density was the main factor with three density gradients（4.5×10^4,6.0×10^4 and 7.5×10^4 plants/hm^2） and the nitrogen amount was the second factor with two different levels of nitrogen content（300 and 375 kg/hm^2）.[Result] The stalk lodging-resistance and yield were affected by planting density significantly.The increase of planting density would result in an increase of internode length and decrease of internode diameter,dry matter weight of per unit stalk length,rind penetration strength and breaking resistance of 3rd and 4th basal internodes.When planting density increased from 6.0×10^4 plants/hm2 to 7.5×10^4 plants/hm^2,the stalk breaking percentage in the whole growing season increased by 17.17%,and the yield reduced by 17.58%.The interaction between planting density and nitrogen amount affected the stalk breaking percentage in the whole growing season and yield significantly.The treatment with planting density of 6.0×104 plants/hm^2 and nitrogen amount of 375 kg/hm^2 of pure N was an optimal combination,which may not only control the stalk breaking percentage of whole growing stage effectively,but also could obtain an optimum grain yield.[Conclusion] In Sichuan Basin,the appropriate planting density and nitrogen amount for summer maize were 6.0×10^4 plants/hm^2 and 375 kg/hm^2.
基金Supported by the Fundamental Research Fund of Chongqing Public Welfare Research Institutes"On the Yield and Photosynthetic Performance under Different Plant-Row Spacing"(cstc-2014jbky-00510)National Maize Industry Technology System(CARS-02-74)Key Innovation Project of Main Crop Varieties during"the 12thFive-Year Plan""On High Yield and High Efficiency Cultivation Techniques for Maize and the Integration and Demonstration"(cstc2012ggC80007)~~
文摘In order to investigate the most suitable sowing period and the optimum planting density of new com variety ‘Yudan 30＇ In Chongqing region, using split plot experiment design, the effect of sowing date and planting density on main a- gronomic characters and yield of maize in the field was studied. The results showed that in Chongqing, the delay of sowing date could shorten the fertility peri- od, and reduce 100-grain Weight and yield, but could increase plant height and ear height, panicle traits did not change significantly. With the density increasing, plant height and ear height also increased, while ear length, ear diameter, stem diameter, row number and kernel number also decreased. 100-grain weight and yield also in- creased with the increase of density, but to a certain threshold, yield and 100-grain weight decreased with the increase of density. The yield of 3 sowing periods pre- sented as AI〉A2〉A3, the yield of 4 kinds of density presented as B3〉EH〉B2〉B1, and the yield under sowing time and density interaction presented as AIB3〉A1B4〉 A2.B3〉A2.B4〉A3B3〉 A3B4〉A2.B2〉A1BI〉A2BI〉A3BI. So proper eady sowing and increase of planting density could raise the yield of maize per unit area, and AIB3 was the optimum planting configuration in Chongqing area.
