Low availability of micronutrients significantly decreases the growth and yield of cereal crops. Among various micronutrients, zinc induced potential positive effects on growth and yield of cereals, especially rice crop. So, far a lot of work has been documented regarding the effect of Zn on growth and yield of rice. However, the aim of the current study was to modify the application rate of Zn in rice under the current scenario for the improvement in growth and yield of rice. Therefore, a field study was planned and conducted under different levels of zinc fertilizer on coarse and fine grain rice varieties i.e., Super Basmati and KSK 434. There were six level of zinc fertilizer including 0.0, 5.0, 7.5, 10.0, 12.5 and 15 kg Zn ha-1. Results confirmed that higher application rate of Zn (15 kg Zn ha-1), significantly increase plant height (15.2%), number of tillers / m2 (4.42%) and spikelets/panicle (82.5%) as compared to control in Super Basmati. Similarly, application of Zn (15 kg Zn ha-1), also improved number of tillers / m2 (2.75%) and spikelets/panicle (37.9%) as compared to control in KSK 434. A significant maximum increase in panicle length and rice yield validated the effectiveness of Zn (15 kg Zn ha-1) as compared to control. It is concluded that for economic point of view application of Zn (12 kg Zn ha-1) is a good but to achieve maximum yield Zn (15 kg Zn ha-1) is a better approach.
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