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Sustainability 2017, 9(8), 1461; doi:10.3390/su9081461

Grain Yield, Dry Weight and Phosphorus Accumulation and Translocation in Two Rice (Oryza sativa L.) Varieties as Affected by Salt-Alkali and Phosphorus

1
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
2
Biology Department, Xinzhou Teachers University, Xinzhou 034000, China
3
Centre of Excellence for Soil Biology, College of Resources and Environment, Southwest University, Beibei, Chongqing 400715, China
These authors contributed equally to this work and should be considered co-first authors.
*
Authors to whom correspondence should be addressed.
Received: 17 July 2017 / Revised: 12 August 2017 / Accepted: 14 August 2017 / Published: 17 August 2017
(This article belongs to the Section Sustainable Agriculture, Food and Wildlife)
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Abstract

Salt-alkali is the main threat to global crop production. The functioning of phosphorus (P) in alleviating damage to crops from saline-alkaline stress may be dependent on the variety of crop but there is little published research on the topic. This pot experiment was conducted to study if P has any effect on rice (Oryza sativa L.) yield, dry matter and P accumulation and translocation in salt-alkaline soils. Plant dry weight and P content at heading and harvest stages of two contrasting saline-alkaline tolerant (Dongdao-4) and sensitive (Tongyu-315) rice varieties were examined under two saline-alkaline (light versus severe) soils and five P supplements (P0, P50, P100, P150 and P200 kg ha−1). The results were: in light saline-alkaline soil, the optimal P levels were found for P150 for Dongdao-4 and for P100 for Tongyu-315 with the greatest grain dry weight and P content. Two rice varieties obtained relatively higher dry weight and P accumulation and translocation in P0. In severe saline-alkaline soil, however, dry weight and P accumulation and translocation, 1000-grain weight, seed-setting rate and grain yield significantly decreased, but effectively increased with P application for Dongdao-4. Tongyu-315 showed lower sensitivity to P nutrition. Thus, a more tolerant variety could have a stronger capacity to absorb and translocate P for grain filling, especially in severe salt-alkaline soils. This should be helpful for consideration in rice breeding and deciding a reasonable P application in saline-alkaline soil. View Full-Text
Keywords: saline-alkaline tolerance; phosphorus application; optimal phosphorus; 1000-grain weight; seed-setting rate saline-alkaline tolerance; phosphorus application; optimal phosphorus; 1000-grain weight; seed-setting rate
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Tian, Z.; Li, J.; He, X.; Jia, X.; Yang, F.; Wang, Z. Grain Yield, Dry Weight and Phosphorus Accumulation and Translocation in Two Rice (Oryza sativa L.) Varieties as Affected by Salt-Alkali and Phosphorus. Sustainability 2017, 9, 1461.

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