Response of rice (Oryza sativa) varieties to nitrogen under aerobic and flooded conditions
DOI:
https://doi.org/10.59797/ija.v58i4.4225Keywords:
Aerobic rice, Crop production, Flooded rice, Net-returns, Nitrogen-use efficiency, Water-use efficiencyAbstract
A field experiment was conducted on a sandy clay loam soil of Central Telangana Zone of Andhra Pradesh dur- ing rainy seasons of 2008 and 2009 to compare the performance of popular rice ( Oryza sativa L.) varieties, viz. MTU 1001, WGL 32100, WGL 14 and WGL 3825 (check) under aerobic and flooded methods of water man- agement and their response to levels of nitrogen viz. 120. 180 and 240 kg/ha. Cultivation of rice with aerobic method (3.49 t/ha) resulted in 29% yield reduction compared with flooded method (4.93 t/ha). Among the yield at- tributes, filled spikelets/panicle were significantly affected under aerobic method, while panicles/m2, test weight and harvest index were not influenced by the method of water management. WGL 32100 gave highest grain yield under aerobic (3.94 t/ha) with the least yield reduction (17%) compared to flooded method, while yield gap was high (40%) in MTU 1001. The water-use efficiency was highest with WGL 32100 and aerobic method (3.4 kg/ha- mm), while flooded method showed more nitrogen-use efficiency (33.5 kg grain/kg nitrogen), and nitrogen uptake (76 kg/ha). Higher net returns ( 26,300/ha) and benefit: cost ratio (1.11) were realized with flood irrigated method. Application of 240 kg N/ha resulted in better yield attributes, increased yield (4.50 t/ha), N uptake (72 kg/ha), wa- ter-use efficiency (3.0 kg/ha-mm), net returns ( 23,062/ha) and benefit: cost ratio (1.21), whereas, the nitrogen- use efficiency was superior with 120 kg N/ha (32.5 kg grain/kg nitrogen) both under aerobic and flood irrigated conditions.References
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