Effect Of Foliar Application Of HA-K On Growing Development And Yield Of ZhangzaGu 10

Millet was the main forage dual-purpose crops in arid regions of northern China.The application of fertilization technology in grain field was one of the main factor affecting millet yield.HA-K was an organic compound potash fertilizer,which owned the characters of high efficiency and environmental protection,and it was reported to increase the yield and quality of wheat,rice and other crops,but the report of application in grain field was few.Therefore,in order to examine the effects of HA-K on growing development and yield of millet,and select the best period and concentration of spraying HA-K,a field experiment was conducted with Zhangzagu 10 by using randomized block experiment design,and set up five spraying concentrations(diluted 2000,1000,500,250,125 times),with spaying water as a control(CK),respectively spraying in the jointing stage,booting stage,heading stage,and filling stage.The main experiments results were as follows:1.From the morphological indexes,the plant height and leaf area of Zhangzagu 10 gradually increased with the increase of concentration at 10,20,30 days after spraying HA-K in jointing stage,the stem diameter had no significant change under different concentration;after spraying the fertilizer in booting stage,the plant height and stem diameter increased,and the increase rang increased first and then decreased with the increase of spraying concentration at 10,20,30 days,and they reached the maximum at 500 times dilution,the leaf area had no significant effect compared with CK under different concentration;after spraying in heading stage,the plant height increased significantly at high concentration,but the increase was not significant at low concentration,and the stem dimeter and leaf area had no significant change under different treatments.2.From the photosynthetic characteristics,SPAD values of millet leaf increased after spraying different concentrations of HA-K,but the change trend of SPAD value with the increase of spraying concentration was different in different stages.The increased range of SPAD value increased first and then decreased with the increase of spraying concentration in jointing stage and booting stage,and it reached the maximum at 500 times dilution;in heading stage,SPAD value gradually increased with the increase of spraying concentration;SPAD value reached the maximum at 250 times dilation in filling stage.The increase of chlorophyll content helps delay leaf function period and increase leaf photosynthetic efficiency.The millet leaf net photosynthetic rate,transpiration rate,stomatal conductance increased compared with CK after spraying HA-K,intercellular CO2 concentration decreased,indicating that spraying HA-K was helpful for stomata opening,and could promote the exchange and assimilation of CO2,and was conducive to the accumulation and transportation of carbohydrates.After spraying HA-K in jointing stage,net photosynthetic rate reached the maximum at 8 days,transpiration rate and stomatal conductance gradually increased with the increase of spraying concentration,after spraying for 16,24 days,net photosynthetic rate,transpiration rate,stomatal conductance all reached the maximum at 500 times dilution,intercellular CO2 concentration reached the minimum at 500 times dilution;after spraying for 8,16,24 days in booting stage and filling stage,net photosynthetic rate,transpiration rate and stomatal conductance reached maximum at 500 times dilution,and they reached the maximum at 1000 times dilution in heading stage.3.From the carbon nitrogen metabolism,the miller leaf soluble sugar,soluble protein and nitrate reductase activity increased after spraying HA-K.The content of soluble sugar increased with the increase of spraying concentration in jointing stage,booting stage and heading stage,and reached the maximum at 125 times dilution,the increase range increased first and then decreased in filling stage,and reached the maximum at 500 times dilution;the change trend of soluble protein and nitrate reductase activity increased first and then decreased with the increase of spraying concentration in different stages,and they reached the maximum at 500 times dilution in jointing stage,booting stage and filling stage,the maximum in heading stage is at 1000 times dilution.From the analysis of yield and yield components,select the reasonable HA-K spraying stage and concentration can significantly influent millet yield.Spraying HA-K in jointing stage could promote the growth of ear length,ear thickness and ear yardage,but the millet ear weight,ear grain weight,1000-gain weight and yield gradually decreased with the increase of spraying concentration;spraying HA-K in booting stage could promote the growth of ear morphology,and ear weight,ear grain weight,1000-gain weight and yield increased after spraying the fertilizer,the increase range increased first and then decreased with the increase of spraying concentration,all ear indexes reached the maximum at 500 times dilution,yield increased significantly by 12.86%compared with CK;spraying HA-K in heading stage could significantly promote the growth of ear weight,ear yardage,ear grain weight,1000-gain weight and yield,but had no significant effect on ear length and ear thickness,all indexes reached the maximum at 1000 times dilution,and yield increased significantly by 12.18%;spraying in filling stage had no significant influence on ear morphology,but ear weight,ear grain weight,1000-gain weight and yield increased significantly,they reached the maximum at 500 times dilution,and yield increased significantly by 9.59%.Therefore,for first-time topdressing,it was best to spray HA-K at 500 times dilution in booting stage,followed by heading stage and filling stage,and jointing stage was not recommended.