To evaluate the relationship between nutrient allocation and juice sac quality of pomelo fruits,so as to provide scientific basis for improving pomelo quality and nutrient management of pomelo orchard,fifty-four 0.60-1.50 kg of pomelo fruits were randomly selected as testing materials.Each fruit was divided into four parts of F(Flavedo),A(Albedo),S(Segment membrane)and J(Juice sac).The concentrations of total ni-trogen(N),total phosphorus(P),total potassium(K),soluble nitrogen(including NH4+-N,NO3--N,AA-N)and soluble phosphorus(SP),as well as the contents of total soluble solid(TSS)and titrable acid(TA)of juice sac were analyzed.The results showed that the ratio of N,P,K in fruits was 8.61:1.00:8.55.Among them,N and P was mainly distributed in F and J,respectively,and K was almost equally distributed in each part of fruit.Soluble N in fruits accounted for 19.35%±2.67%of total N with the main form as AA-N,among which the proportion of AA-N,NO3--N and NH4+-N was 15.45%±0.70%,2.55%±0.08%and 1.35%±1.89%,respectively.NO3--N and NH4+-N was mainly distributed in A and J,respectively,and AA-N was similarly distributed in each part.Soluble P in fruits accounted for 10.63%±0.09%of total P and mainly existed in J.Correlation analysis showed that the ratio of TSS and TA(TSS/TA)was positively correlated with SP,while negatively correlated with NH4+-N of juice sac.The results of principal component analysis showed that SP of juice sac was the major factor affecting the ratio of TSS and TA.The allocation of N,P and K and its soluble forms in fruits differed in the different parts of pomelo fruits,suggesting the rea-sonable fertilization ratio is'high N,low P and high K'.
维普
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