Annual Dynamics of Nitrogen,Phosphorus and Potassium in Leaves of ’Shanhuang’ Apricot Tree

doi:10.3321/j.issn:1000-7091.1993.02.018

Abstract

Abstract: N.P.K.in the leaves of the' Shanhuang' apricot tree tended to decrease within the first 60 days after blossoming.The N level tended to increase with physiological differentiation of flower buds between 60 and 90 days after blossoming,and to decrease with morphological differentiation of flower buds after these days.The P level changed little from the 60th day after blossoming to the time of leave-falling.The K level tended to increase with morphological differentiation of the flower bud 95 days after blossoming.Comprehensive analyses indicated that it was necessary to apply organic manure or N- P- K composite during the period after harvesting and before leave-falling;to apply N fertilizers within the first 60 days right aftet blossoming jand to apply K fertilizers between 65 and 95 days after blossoming.The analyses of N.P.K.relationship demonstrated that apricot was a potassium-loving tree species.

Key words: Shanhuang' apricot, Nitrogen, Phosphorus, Potassium, Annual dynamics

Wang Yuzhu. Annual Dynamics of Nitrogen,Phosphorus and Potassium in Leaves of ’Shanhuang’ Apricot Tree[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1993, 8(2): 92-95. doi: 10.3321/j.issn:1000-7091.1993.02.018.

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