Aldrich W N, Nitrogen intake and translocation in apple trees following fall, winter and spring sodium nitrate applications, Proc Soc Hort Sci 1931 C28):532~538
[2]
Cooper D Rr Hill-Cottingham D U,Distribution and identity of labelled products following autumn application of abelled urea or potassiu m nitrate fertilisers to apple trees, J Sci Fd Agric, 1976 (27):366~372
[3]
Hill-Cottingham D Gi Williams R R,);ffect of time of application of fertiliser nitrogen on the growth, flower'' development and fruit set of maden apple trees， var, lord lambourne, and on the distribution of total ritrogen within the trees, J Hort Sci，1967 (42):319~338
