S. P. Singh, K. K. Paikra, Chanchala Rani Patel
Abstract: Field experiments was conducted in kharif 2016 at the Instructional Farm of Krishi Vigyan Kendra, Raigarh (C.G.), to find out the effect of different levels of zinc (0, 5, 10, 15, 20, 25 and 30 kg Zn SO4 ha-1) on yield, economics and Zn uptake by rice. The results revealed that the rice responded significantly to graded doses of zinc application. The highest grain (4.85 t ha-1) and straw yield (6.58 t ha-1) was recorded at 25 kg ZnSO4 ha-1 which was 50.62 % and 20.73 % greater than control, respectively. The highest zinc concentration (22.50 mg kg-1, 46.40 mg kg-1) and uptake (109.12 g ha-1, 305.97 g ha-1) in grain and straw were recorded at 25 kg ZnSO4 ha-1. The highest apparent zinc recovery (2.48 %) was recorded at lower level of zinc application. However. increasing levels of Zn increased available Zn (1.42 mg kg-1) in post harvest soil was noted at 30 kg Zn SO4 ha-1. All growth and yield parameters were performed better under 25 kg Zn SO4 ha-1. Net returns (Rs.38065.00 ha-1) and B C ratios (2.10) were recorded highest with 25 kg Zn SO4 ha-1.
Keywords: Zinc response, yield, zinc uptake, zinc use efficiency, residual zinc, and rice