6[5]Murthy S V K, Kotur S C. Fertilizer use efficiency in citrus, grape,banana, mango and guava as influenced by time of application and placement method[J]. J. of Agric. Sci. , 1998, 11 (4): 1023-1029 被引量:1
7[9]Lis Krzyscin A. Effect of nitrogen fertilization on growth and development of Pelargonium X hortorum. I. Effect of different N levels [J]. Folia Horticulturae, 1999, 11: 1,45-52. 被引量:1
8[14]Williams R R. The effect of summer nitrogen applications on the quality of apple blossom [J]. J. Hort. Sci. ,1965,40: 31-41. 被引量:1
9[15]Khemira H. Influence of canopy orientation on fruiting of "Anjou"pears and postharvest urea spray on ovule longevity and fruit set of "Comice" pears[ D]. MS thesis, Corvallis: Oregon State University, 1991. 被引量:1
10[16]DeJong T M. Leaf nitrogen content and CO2 assimilation capacity in peach [J]. J. Amer. Sc. Hort. Sci. ,1982, 107: 955-959. 被引量:1