4[4]Nielsen K L. Effects of nitrogen and potassium supply on growth and variability of potting roses[J]. Hordbrugs Forskning,1999,3:7-8.
5[5]Lewis D. Effect of N-P-K fertilizer on the growth of Limonium perigrinum Ballerina Rose[J]. New Zealand Journal of Crop and Horticultural Science, 1994,22:217-220.