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Agronomy 2019, 9(2), 100; https://doi.org/10.3390/agronomy9020100

Effect of Irrigation Regimes and Soil Texture on the Potassium Utilization Efficiency of Rice

1
College of Agricultural Engineering, Hohai University, Nanjing 210098, China
2
Department of Soil and Land Reclamation, Aleppo University, Aleppo 1319, Syria
3
Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
4
Department of Agronomy, Faculty of Agriculture, Mansoura University, Mansoura 35516, Egypt
5
Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
*
Author to whom correspondence should be addressed.
Received: 4 January 2019 / Revised: 2 February 2019 / Accepted: 18 February 2019 / Published: 20 February 2019
(This article belongs to the Section Water Use and Irrigation)
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Abstract

Understanding the effects of irrigation regime and soil texture on potassium-use efficiency (KUE) of rice (Oryza sativa. L) is essential for improving rice productivity. In this regard, experiments were conducted from July to October in 2016 and 2017 by using a randomized complete block design in a factorial arrangement with four replications. The rice plants were grown in three soils, with clay contents of 40%, 50%, and 60%, which were marked as S (40%), S (50%), and S (60%), respectively. For each soil type, irrigation regimes, namely, R (F, S100%), R (F, S90%), and R (F, S70%), were established by setting the lower limit of irrigation to 100%, 90%, and 70% of saturated soil water content, respectively, and the upper limit of irrigation with 30 mm of flooding water above the soil surface for all irrigation regimes. Results showed that the responses of the roots and shoots and the potassium accumulation (KA) and KUE of rice were significantly affected by the water regime and soil texture. In the same irrigation regime, increasing the soil clay content improved the K utilization of rice. Under the same soil type, R (F, S100%) was the optimal water management practice for growing rice. The R (F, S100%) S (60%) treatment presented the highest KUE, which was 56.4% in 2016 and 68.1% in 2017. The R (F, S70%) S (40%) treatment showed the lowest KUE, which was 13.8% in 2016 and 14.9% in 2017. These results enrich knowledge regarding the relationship among soil, water, and rice, and provide valuable insights on the effect of irrigation regime and soil texture on the KA and KUE of rice. View Full-Text
Keywords: water regime; soil clay content; yield; potassium use efficiency; rice water regime; soil clay content; yield; potassium use efficiency; rice
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Alhaj Hamoud, Y.; Wang, Z.; Guo, X.; Shaghaleh, H.; Sheteiwy, M.; Chen, S.; Qiu, R.; Elbashier, M.M.A. Effect of Irrigation Regimes and Soil Texture on the Potassium Utilization Efficiency of Rice. Agronomy 2019, 9, 100.

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