Biomass composition and fertilizer requirement in Carya illinoensis
[Objective]To explore the biomass composition and nutrient demand rules of Carya illinoensis young plants,which could provide a theoretical basis for the rational fertilization of young plants.[Method]Through the investigation of the biomass composition of young plants and the determination of mineral element content,the nutrient demand of young plants in different growth and development periods was clarified.The biomass of different organs,including the content of N,P,K,Ca,Mg,Fe,Mn,Cu and Zn,was used to calculate the proportion of mineral nutrient demand in the annual cycle of young plants.[Result]The biomass of young plants was mainly composed of roots,stems,branches and leaves,root biomass was about 1/2 of the whole plant,The branch biomass was about 1/3,stem biomass accounts for about 1/7,leaf biomass was about 1/25.The dry matter contents in different periods in a decreasing order was November,March,September,July,May,and the relative dry matter contents in different organs in a decreasing order was underground,root,above ground,branch,stem,leaf;The allocation ratio of major elements of N,P,K,Ca,Mg in the biomass of each single plant was 8.02:1.00:9.24:31.15:1.09,in which,the ratio contents of Ca was the highest,which was up to 60.71%;The distribution ratio of micro elements of Mn,Fe,Cu and Zn was 43.06:28.31:1.00:4.96,and the demand for Mn and Fe was much greater than that of other micro elements;The primary demand for young plants in March was Fe,and in May was N,P and Mg,and in July was Mg and Fe,and in September was mainly K,and in November was mainly Ca,and Mn was in high demand in both May and November.[Conclusion]The proportion of the biomass composition of different organs,the demand ratio of a large number of elements and trace elements,and the demand status of different mineral nutrients in different growth and development periods were clarified.
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