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Yield and phosphorus efficiency of some lowland rice varieties at different levels of soil‐available phosphorus

 

作者: M. A. Saleque,   M. J. Abedin,   G. M. Panaullah,   N. I. Bhuiyan,  

 

期刊: Communications in Soil Science and Plant Analysis  (Taylor Available online 1998)
卷期: Volume 29, issue 19-20  

页码: 2905-2916

 

ISSN:0010-3624

 

年代: 1998

 

DOI:10.1080/00103629809370164

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

A field experiment was conducted on an Aerie Haplaquept soil to study the effect of phosphorus (P) deficiency in soil on the P nutrition and yield of five modern varieties of rice, viz., Purbachi, BR1, BR3, BR14, and BR29, popular with the rice farmers of Bangladesh. Soil‐available P in the different plots of the experimental field varied widely, from 2.8 to 16.4 ppm. This plot to plot variation in soil‐available P content resulted from differences in the total amounts (0 to 480 kg ha‐1) of P the plots had received over a period of 8 years in a long‐term P fertilizer trial conducted previously in the same field. Phosphorus deficiency in soil drastically reduced the grain yield of all the rice varieties. In severely P deficient plots, where soil‐available P was around 3 ppm, the yield was less than 1 ton ha‐1while in plots containing an adequate P level, i.e., >6 ppm, the yield was more than 41 ha‐1. Rice yield increased linearly with an increase in soil P content up to 6 ppm, and the highest grain yield for any variety, obtained at 6–7 ppm of soil‐available P leveled off at this point. Soil P deficiency not only decreased rice yield severely but also decreased P content in straw and grain drastically. However, differences among rice varieties were noted in P nutrition, particularly at low soil P levels. The rice varieties differed markedly also in respect of internal P efficiency. The BR29 showed the highest internal P efficiency both at low and high soil P levels. In all the rice varieties, internal P efficiency decreased with an increase in soil P levels.

 

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