Zinc fertilization under optimum soil moisture condition improved the aromatic rice productivity
2016
Ali, H. | Sarwar, N. | Hasnain, Z. | Ahmad, S. | Hussain, A.
Zinc deficiency is a barrier in achieving higher rice yield and also a cause of zinc malnutrition in developing countries. Various approaches are under study for zinc fertilization to meet the crop requirement. Thus the present study was carried out to see the impact of root applied zinc on rice productivity under variable irrigation regimes for two consecutive years 2009-2010. Various levels of zinc fertilization: (Zn sub 1) 0, (Zn sub 2) 8, (Zn sub 3) 10, (Zn sub 4) 12, and (Zn sub 5) 14 kg/ha were applied to soil under different irrigation regimes; 6 (I sub 1), 8 (I sub 2), 10 (I sub 3), 12 (I sub 4) and 14 (I sub 5) irrigations. Two sites from major rice producing areas were selected for comparison. Rice plants significantly improved growth in terms of LAI, LAD and NAR with an increase in zinc and irrigation levels while the major increase was observed with 14kg zinc/ha under 12 irrigations. The crop plants were highly efficient in using available radiation when grown under 12 irrigations with 14kg Zn/ha. The paddy yield and yield parameters were correlated with higher growth rate and performed best under the treatment combination of I sub 4 Zn sub 5. Likewise, zinc fertilization under optimum moisture condition was also economically sustained. Rice growth and yields were substantially poor at lower application of zinc fertilizer and irrigation during both years under different ecological regions.
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