References
- Baethgen , W. E. and Alley , M. M. 1989 . A manual colorimetric procedure for measuring ammonium‐N in soil and plant kjeldahl digests . Commmunications in soil science and plant analysis , 20 : 961 – 969 .
- Boynton , D. and Cain , J. C. 1943 . A survey of the relationships between leaf N, fruit colour, and percent of full crop in some New York Mclntosh orchards . Proceedings of the American Society for Horticultural Science , 40 : 19 – 22 .
- Knee , M. 1972 . Anthocyanin, carotenoid, and chlorophyll changes in the peel of Cox's orange Pippin apples during ripening on and off the tree . Journal of experimental botany , 23 : 184 – 196 .
- Lancaster , J. E. , Grant , J. E. , Lister , C. E. and Taylor , M. C. 1994 . Skin colour in apples—influence of copigmentation and plastid pigments on shade and darkness of red colour in five genotypes . Journal of the American Society for Horticultural Science , 119 : 63 – 69 .
- McGuire , R. G. 1992 . Reporting of objective colour measurements . HortScience , 27 : 1254 – 1255 .
- Saitoh , H. and Suzuki , C. 1984 . The influence of N application on sugar metabolism and anthocyanin formation in apples . Bulletin of the Faculty of Agriculture, Hirosaki University , 41 : 17 – 27 .
- Saure , M. 1990 . External control of anthocyanin formation in apple . Scientia horticulturae , 42 : 181 – 218 .
- Siegelmen , H. W. and Hendricks , S. B. 1958 . Photocontrol of anthocyanin synthesis in apple skin . Plant physiology (Lancaster) , 33 : 185 – 190 .
- Weeks , W. D. , Southwick , F. W. , Drake , M. and Steckel , J. E. 1958 . The effect of varying rates of N and potassium on the mineral composition of Mclntosh foliage and fruit colour . Journal of American Society of Horticultural Science , 71 : 11 – 19 .