Effect of nitrogen on productivity, soil fertility and economics of rice (Oryza sativa) -potato (Solanum tuberosum) -wheat (Triticum aestivum) cropping system

Singh, S.P.; Kushwah, V.S.; Lal, S.S.

Indian Journal of Agricultural Sciences 74(7): 385-387


ISSN/ISBN: 0019-5022
Accession: 004124621

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A field experiment was conducted on rice-potato-wheat system in Gwalior, Madhya Pradesh, India, during 2001/02 and 2002/03 to study the effect of varying N rates on productivity and soil fertility. The treatments comprised 2 rice cultivars (IR 64 and Mahamaya) and 3 rates of N fertilizer (80, 100 and 120 kg/ha) to rice. In the succeeding potato crop, the recommended rate of 180 kg N, 34.9 kg P and 100 kg K/ha was applied. In the succeeding wheat crop, only 120 kg N/ha was applied. There were significant higher number of tillers per hill and panicles per hill for IR 64, whereas plant height, number of filled grains per panicle and 1000-grain weight were higher with Mahamaya. The highest grain yield (7.37 tonnes) was recorded with Mahamaya supplemented with 120 kg N/ha. There were significantly higher plant height and tubers per plant under treatments where potato was planted after IR 64 compared to potatoes planted after Mahamaya. The residual effect of N applied to rice on potato crop was at par. The highest tuber yield (29.5 t/ha) was recorded in potato planted after harvest of IR 64 supplemented with 100 kg N/ha. The highest wheat-equivalent yield, production efficiency and net returns in rice--potato-wheat sequence were recorded with IR 64 supplemented with 100 kg N, 17.5 kg P and 25.0 kg K/ha, potato with 180 kg N, 34.9 kg P and 100 kg K, and wheat with only 120 kg N/ha under rice-potato-wheat system. The reduction in available soil P and K was initially observed in the treatment where IR 64 was supplemented with 100 kg N/ha after 2 years.