Absorption and Distribution Regulation of Potassium in Winter Jujube Tree in Yellow River Delta Region
To provide a theoretical reference for potassium fertilization of winter jujube tree in Yellow River Delta(YRD)region,the characters of potassium absorption and distribution in different growth stage were investigated using 10-year-old winter jujube trees in YRD region.Results:Growth rate of winter jujube tree was slow in sprouting stage leading to less dry matter accumulation and slower uptake rate of potassium,and therefore absorption amount in this stage only accounted for 5.33% of the total,of which,88.25% distributed in leaves. Compared to sprouting stage, growth rate and dry matter accumulation increased in flowering stage,in which the absorption rate was up to 0.42 g/(plant·d)and absorption amount accounted for 19.57% of the total.In fruit enlargement period dry matter accumulation slightly increased and absorption amount accounted for 34.46% of the total.Fruit maturity stage was the peak of dry matter accumulation,in which the absorption rates reached 0.49 g/(plant d),and absorption amounts accounted for 40.64% of the total,of which 14.2% was accumulated in fruits.It is concluded that potassium application should be minimized in sprouting stage,properly increased in flowering period, and significantly increased in fruit enlargement period and fruit maturity stage.
winter jujube treepotassium fertilizerabsorptiondistributionYellow River Delta
NETL
NSTL
万方数据
维普
