Yield and soil fertility trends in a 20-year rice-rice-wheat experiment in Nepal

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dc.creatorRegmi, A.P.
dc.creatorLadha, J.K.
dc.creatorPathak, H.
dc.creatorPasuquin, E.
dc.creatorBueno, C.
dc.creatorDawe, D.
dc.creatorHobbs, P.R.
dc.creatorJoshy, D.
dc.creatorMaskey, S.L.
dc.creatorPandey, S.P.
dc.date2002-05
dc.date2024-12-19T12:56:51Z
dc.date2024-12-19T12:56:51Z
dc.date.accessioned2026-06-27T04:14:42Z
dc.descriptionThe rice (Oryza sativaL.)–wheat (Triticum aestivumL.) cropping system occupies about 13.5 million ha in South Asia and is important for the region's food security. We examined the long‐term yield trends, changes in soil nutrient fractions (both total and available), and nutrient balances in a 20‐yr rice–rice–wheat experiment conducted in the Indo‐Gangetic plain of Nepal. The yield of first rice crop fertilized with recommended NPK fertilizer or farmyard manure (FYM) declined an average of 0.09 or 0.07 Mg ha−1yr−1, respectively. These 20‐yr trends explained only 20 to 21% of the variability in yield, and inexplicable shorter‐term yield trends were observed. Likewise, wheat yield declined at 0.05 Mg ha−1yr−1(with both NPK and FYM) over the 20 yr. However, the yield of second rice crop did not decline over that period. The total and available N and P, and total and labile C contents of soil from Year 10 to 20 were either maintained or increased, but total K and available K declined. The apparent K balance showed net losses of 62.3 and 15.2 kg K ha−1yr−1with NPK and FYM treatments, respectively. Depletion of soil K and inadequate K fertilization seems to be the primary reasons of limited and declining yield of first rice and wheat crop. In addition, the yield of wheat declined because of a delay in sowing, which was estimated to be 0.04 Mg ha−1for each day delay in sowing. The study showed that the current local fertilizer recommendations, particularly for K, for the rice–rice–wheat system are inadequate.
dc.identifierhttps://hdl.handle.net/10568/166966
dc.identifier.urihttp://hdl.handle.net/123456789/26365
dc.languageen
dc.publisherWiley
dc.sourceRegmi, A. P.; Ladha, J. K.; Pathak, H.; Pasuquin, E.; Bueno, C.; Dawe, D.; Hobbs, P. R.; Joshy, D.; Maskey, S. L. and Pandey, S. P. 2002. Yield and soil fertility trends in a 20-year rice-rice-wheat experiment in Nepal. Soil Science Soc of Amer J, Volume 66 no. 3 p. 857-867
dc.subjectsoil fertility
dc.subjectnutrient balance
dc.subjectnpk fertilizers
dc.subjectfarmyard manure
dc.subjectyields
dc.subjectrice wheat cropping system
dc.subjectlong term experiments
dc.subjectnepal
dc.titleYield and soil fertility trends in a 20-year rice-rice-wheat experiment in Nepal
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)