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Exploring the Yield Response of Paddy (Oryza sativa L.) under Varying Levels of Soil Nitrogen, Phosphorus and Potassium

Authors:

H. P. G. T. N. Kulasinghe,

University of Peradeniya, Peradeniya, LK
About H. P. G. T. N.
Postgraduate Institute of Agriculture
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U. W. A. Vitharana ,

University of Peradeniya, Peradeniya, LK
About U. W. A.
Department of Soil Science, Faculty of Agriculture
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R. S. Dharmakeerthi,

University of Peradeniya, Peradeniya, LK
About R. S.
Department of Soil Science, Faculty of Agriculture
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D. N. Sirisena,

Rice Research and Development Institute, Department of Agriculture, Batalegogda, LK
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W. M. U. K. Rathnayake

Rice Research and Development Institute, Department of Agriculture, Batalegogda, LK
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Abstract

Assessment of crop responses under varying levels of soil available nitrogen (N), phosphorus (P) and potassium (K) is important to develop site-specific nutrient management (SSNM) strategies. This study was conducted to investigate the spatial variability of soil N, P and K levels in paddy grown soils in Anuradhapura, Kurunegala and Polonnaruwa districts and corresponding yield response for nutrient application. Seventy-one paddy fields were selected and four plots (3×6 m) were established at each site comprised of a treatment applied with ample amount of N, P and K and corresponding omission treatments. At harvesting, total yield of each plot was recorded. Considerable heterogeneity of soil N (12.5-43.9 mg/kg), P (2.7-34.2 mg/kg) and K (14.6-221.9 mg/kg) was observed in paddy grown soils of the three districts. A significantly higher average yield of N applied treatment (5.8 Mg/ha) than that of N omitted treatment (3.9 Mg/ha) indicated a yield response for N application. However, nonsignificant differences of average yields of P (5.7 Mg/ha) and K (5.6 Mg/ha) omitted and ample treatments (5.8 Mg/ha) revealed a poor yield response for the application of these nutrients. Stepwise multiple regression analysis revealed that neither the initial soil P and K levels nor the other studied factors (growing season, irrigation scheme, soil texture, pH, EC, available Fe and Mg) have an impact on yield responses observed for P and K applications. Our results indicated large spatial heterogeneity in soil P and K levels in paddy grown soils. Absence of a significant response for the applied P and K and a considerable variability of yield responses highlighted the need of further studies on P and K reserves of paddy growing soils and factors controlling the variability in yield response. Further, site-specific application of N is shown as a priority to improve the productivity of paddy lands.
How to Cite: Kulasinghe, H.P.G.T.N., Vitharana, U.W.A., Dharmakeerthi, R.S., Sirisena, D.N. and Rathnayake, W.M.U.K., 2020. Exploring the Yield Response of Paddy (Oryza sativa L.) under Varying Levels of Soil Nitrogen, Phosphorus and Potassium. Tropical Agricultural Research, 31(4), pp.01–12. DOI: http://doi.org/10.4038/tar.v31i4.8416
Published on 06 Oct 2020.
Peer Reviewed

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