1. ALCARAZ, C.F. and BANET, E. Influence of some nutritional alterations on the effectiveness of the nitrate reductase activity as an index of the nitrogen requirements in lemon trees. Proc. 4th. Int. Coll. Control Plant Nutrition. Vol. 1, pp.51–60. Gent.
2. Nitrate nitrogen and nitrate reductase activity in Verna lemon tree leaves
3. ALCARAZ, C.F., BERNAL, J.M., HELLIN, E. and SEVILLA, F. Leaf ferredoxin levels related with iron nutrient status in citrus plants. Proc. 6th Int. Coll. Optimization Plant Nutrition. Edited by: Martin‐Prevel, P. Vol. 1, pp.19–26. Montpellier: AIONP/GERDAT.
4. BAR‐AKIVA, A. The use of the activity of metalloenzyme systems for the appraisal of nutritional requirements of citrus trees. Proc. 1st Int. Citrus Symp. Edited by: Chapman, H. D. Vol. 3, pp.1551–1557. Riverside: University of California.