Moin Uddin has completed his PhD in 1987 from the Botany Department, Aligarh Muslim University (AMU) and conducted his postdoctoral studies from CIMMYT (Mexico), IARI (New Delhi) and Potash Research Institute of India (PRI). At present, he is Associate Professor in Botany in the Women’s College, AMU, Aligarh, UP, India. He has published more than 65 research papers and review articles/book chapters in scientific journals/books of national and international repute. He has been the Editor of Journal of Potassium Research, published from PRI (Gurgaon, India). He is also working on innovative teaching methodology using ICT means for undergraduate students.


In view of exploring the role of K and Zn in manifestation of physiological attributes, yield, and proximate-composition of guar (Cyamopsis tetragonoloba L.), a field experiment was conducted in a loamy sand soil deficient in K and Zn. The experiment was conducted with factorial randomized block design using three replicates. Five rates of K application, viz. K0 (no K application), K30 (30 kg K2O ha-1), K60 (60 kg K2O ha-1), K90 (90 kg K2O ha-1) and K120 (120 kg K2O ha-1) were applied along with two levels of zinc, viz. Zn0 (no zinc application) and Zn10 (10 kg ZnSO4 ha-1). Increasing K levels improved the physiological parameters, yield characteristics and quality attributes of guar irrespective of Zn application. However, Zn application significantly enhanced the values of most of the attributes studied in such a way that the benefit of zinc application increased progressively with increasing K levels, depicting positive interaction between K and Zn. Generally, K120 proved the best K application rate; however, K90 was statistically at par with K120 in most of the cases. K90 + Zn10 proved optimum K and Zn combination for most of the parameters studied. It improved the chlorophyll content by 45.5% and the activity of nitrate reductase and carbonic anhydrase by 20.0 and 31.3%, respectively. Further, it augmented the seed yield by 48.7%, total crop biomass by 26.9%, seed protein content by 3.6%, seed fat content by 1.2% and the gum-yield of guar seed by 4.6% as compared to the control (K0 + Zn0).