Effects Of Density And Fertilization Level On Yield And Photosynthetic Capacity Of Millet Population

In order to investigate the accurate influence of density and nitrogen,phosphorus and potassium fertilizer levels on grain yield and population photosynthetic capacity,the new variety of Jiugu 19 was used as the material.L9（3⁴）orthogonal test design was adopted.Density was set as follows:(300,000 plants·hm^-2,450,000 plants·hm^-2 and 600,000plants·hm^-2),nitrogen（N）level(60 kg·hm^-2,120 kg·hm^-2 and 180 kg·hm^-2),phosphorus（P₂O₅）level(75 kg·hm^-2,110 kg·hm^-2 and 145 kg·hm^-2)and potassium（K₂O）level(0kg·hm^-2,45 kg·hm^-2 and 90 kg·hm^-2).The effects of different treatments on yield,agronomic characters and population photosynthetic capacity and population stomatal conductance and population transpiration intensity were systematically analyzed.The major conclusions were as follows:1.The differences in yield difference,millet densities,nitrogen and potassium application levels lead to significant distinctions of production,while the difference in the yield of millet at different phosphorus application levels fails to cause significant changes of the production.The density effect showed that the yield of 600,000 plants·hm^-2 was the highest,the yield of 120 kg·hm^-2 was the highest,and the yield of 90 kg·hm^-2 was the highest for the nitrogen（N）application effect.2.The highest effects of earbearing rate of tiller,ear length and 1000-grain weight density were in 300,000 plants·hm^-2,and the effects of nitrogen（N）and phosphorus（P₂O₅）application were not significant.There was no significant difference in potassium（K2O）effect of grain heading rate.potassium（K2O）effect on ear length and thousand kernel weight of millet was highest at 90 kg·hm^-2.3.There were significant differences in the area index of millet leaves under different densities,nitrogen and potassium application levels.The highest density effect was highest for 600,000 plants·hm^-2,the highest nitrogen（N）effect was 120 kg·hm^-2,the potassium（K₂O）effect was 90 kg·hm^-2,and the phosphorus（P₂O₅）effect was not significant.4.Millet group of photosynthetic ability,stomatal conductance and transpiration intensity in different density,applied amount of N and K levels have caused significant difference,the highest density effect of 600000 strains hm^-2,the highest nitrogen（N）effect characterized by 120 kg·hm^-2,K（K₂O）effect is 90 kg·hm^-2,P（P₂O₅）was no significant difference effect.5.There were significant differences in water use efficiency of millet under different densities,nitrogen and potassium application levels.The highest density effect was for300,000 plants·hm^-2,the highest nitrogen（N）effect was 120 kg·hm^-2,the highest potassium（K₂O）effect was 90 kg·hm^-2,and the phosphorus（P₂O₅）effect was not significant.6.The yield of millet was significant positively correlated with population photosynthetic capacity and population stomatal conductance and population transpiration intensity of the leaves after 10 days of full heading.To sum up,the best cultivation measures for the new variety Jiugu 19 were 600,000plants with a density of·hm^-2,the level of nitrogen（N）application of 120 kg·hm^-2,the level of phosphorus（P₂O₅）of 75 kg·hm^-2 and the level of potassium（K₂O）application of 90kg·hm^-2.