Effect of foliar application of different sources of Zn on the changes in Zn content, uptake and yield of rice (Oryza sativa L.).

摘要

In a study conducted in West Bengal, India, during the rabi seasons of 1999-2000 and 2000-01, the results show that the amount of Zn content in and uptake by grain (17.6 mg kg-1 and 85.6 g ha-1) and straw (17.0 mg kg-1 and 123.4 g ha-1) were increased significantly in the treatment F3 where twice foliar applications of Zn as Zn-EDTA at 0.05% was made with the simultaneous highest increase in grain (4.9 t ha-1) and straw (7.2 t ha-1), respectively, compared to foliar applications of same levels of Zn as ZnSO4 being 16.0 and 38.8% increase in the yield of grain and straw, respectively, over that of the control, no application of Zn. The results also clearly indicated that the yield of both grain and straw due to foliar application of Zn either in the form of Zn-EDTA or ZnSO4 were significantly positively correlated with the Zn uptake by grain and straw, being more significant with Zn-EDTA application. The grain yield vs. Zn content in grain showed a significant positive correlation (r=0.82**), suggesting an important role of Zn towards contributing the yield of rice.