Effects of different phosphorus levels on date palm seedling growth,physiological indexes and nutrient elements contents
[Objective]This study analyzed the effect of different phosphorus(P)levels on date palm seedling growth,physiological indexes,nutrient elements contents to provide theoretical basis for developing balanced technique of fer-tilization of date palm seedling.[Method]Selecting date palm seedlings as research material,a pot+nutrient solution experiment was conducted.The nutrient solution was set at 4 P levels with concentrations of 5(CK),100,1000 and 5000 μmol/L.The growth,physiological indexes and nutrient element conctents of the date palm seedlings were observed and measured after 7 months of cultivation.[Result]Under the 5 μmol/L P level,the growth of date palm seedlings was weak.Under the 100 μmol/L P level,the fresh weight of root was significantly lower than that under the 1000 μmol/L P level(P<0.05,the same below).Under the 1000 μmol/L P level,the growth of date palm seedlings grew well,the fresh weight of root,dry weight of shoot,the increment of plant height,the P concentration of plant,the P accumulation of plant,the soluble protein concentration of the 3rd and 6rd leaves were significantly higher than those under CK.The newly sprouted leaves were dense,the P use efficiency of root and plant were the lowest under the 5000 μmol/L P level.Under the same P level,the P content in shoot tip was higher than that in leaves and root tip.The concentration of nitrogen(N),potassium(K),calcium(Ca),magnesium(Mg),sodium(Na),aluminium(Al)in shoot and root were different under different P levels.With the increase of P level,the concentration of K,Al in shoot and root,and the concentration of Ca in shoot increased initially and then decreased,the concentration of Mg in shoot gradually increased,and the concentra-tion of Ca and Mg in root gradually decreased.Under the 5000 μmol/L P level,the concentration of Na in shoot and root reached the highest.Under the 1000 μmol/L P level,the accumulation of N,K,Mg,Na and Al in the shoot,the N use efficiency in shoot,the Ca use efficiency in shoot and root were significantly higher than those under CK.[Conclusion]The P level in nutrient solution affects the growth,physiological indexes,concentration,accumulation and use efficiency of nutrient element of date palm seedlings.Too low or too high P level is not conducive to the growth of date palm seed-lings.Under 1000 μmol/L P level,date palm seedlings grow well.
date palmphosphorusseedling growthphysiological indexnutrient element
万方数据
维普
