Dynamic analysis of content and accumulation of mineral elements in branch-leaf mixture and seeds of Torrey a grandis 'Merrillii' during the early growth stage
[Objective]The objective is to explore the relationship between the content and accumulation of mineral elements in the branch-leaf mixture and seeds of Torreya grandis'Merrillii'during the early growth stage of seeds,in order to provide a basis for scientific fertilization and improve the quality and yield of T.grandis'Merrillii'seeds.[Method]T.grandis'Merrillii'trees(2 a rootstocks and 17 a after grafting)were selected for experiment on Donghu campus of Zhejiang A&F University.Lateral branches(with leaves)and seeds of the second generation were collected from early March to early July,and the dynamic changes in nitrogen(N),phosphorus(P),potassium(K),calcium(Ca),magnesium(Mg),zinc(Zn),manganese(Mn)and copper(Cu)content and accumulation in branch-leaf mixture and seeds were analyzed.[Result]In the early growth stage of T.grandis'Merrillii'seeds,there was no significant change in the transverse and longitudinal diameter of the seeds,dry and fresh weight,and moisture content of each fruit before early April.However,from mid April to mid June,the growth rate increased rapidly and then stabilized,and the accumulation of N,P,and K in branch-leaf mixture decreased while the accumulation and content of N,P,and K in seeds continued to increase,which indicated that N,P,and K in branch-leaf mixture were preferentially supplied to the growth of seeds.During the slow growth and flower bud differentiation stage,the demand for N,P,and K by seeds was relatively small,while during the rapid growth stage,the demand for N,P,and K by seeds increased.This phenomenon intensified with time.On a time scale,Ca gradually absorbed and accumulated in the branch-leaf mixture,while Ca content and accumulation in seeds decreased and ertremely decreased significantly.After the rapid growth period,the accumulation of Mg in seeds increased,while the accumulation and content of Mg in branch-leaf mixture decreased with the expansion of seeds.During the early growth stage of T.grandis'Merrillii'seeds,the accumulation of Zn and Cu in branch-leaf mixture showed a decreasing trend,and the seed had a relatively small demand for Zn,Cu and Mn.[Conclusion](1)The volume and moisture content of the fast-growing T.grandis'Merrillii'seeds increase rapidly,and tend to stabilize after the filling period.(2)The content and accumulation of elements are closely related to the long-term growth of T.grandis'Merrillii'seeds.To improve the quality of seeds,N,P and K fertilizers should be applied at the end of the slow growth period and the beginning of the fast growth period,along with an appropriate amount of trace element fertilizers such as Zn and Cu.Mg fertilizer should be applied after seed harvest.[Ch,5 fig.27 ref.]
Torreya grandis'Merrillii'branch-leaf mixture and seedsmineral elementscontent and accumulationdynamics
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