THE ROLE OF PHOSPHOROUS MANAGEMENT IN SALINITY TOLERANCE ALLEVIATION IN RICE CROP

BASSIOUNI A. ZAYED
2012 Egyptian Journal of Agricultural Research  
Integrating crop management of rice is the main strategy for maximizing rice productivity in Egypt under saline soils. Exogenous application of some nutrients such as phosphorous application will ensure high salt tolerance and productivity of rice under saline soil. Two field experiments were conducted in seasons of 2010 and 2011 seasons at The Farm of El Sirw Agricultural Research Station, Dammietta Governorate, Egypt. The soil texture was clayey. Salinity levels were 7.5 and 6.5dS/m during
more » ... d 6.5dS/m during 2010 and 2011 seasons, respectively. The response of Giza 178 rice variety to various treatments of phosphorous management was studied under saline soil namely; control(1), basal application of recommended phosphorous for rice under saline soil i.e.60 kg P2O5 ha -1 (2), diammonium phosphate (DAP) spray with the concentration of 2 % at mid tillering stage(MT) (3), potassium tri-phosphate(KTP) spray at MT 2% (4), basal application of recommended phosphorous+ 2%of DAP at MT(5), basal application of recommended phosphorous+ 2%of KTP at MT(6), DAP spray 2% at panicle initiation(PI) (7) , KTP 2% at panicle initiation(PI) (8), basal application of recommended phosphorous+ 2%of DAP at PI(9), basal application of recommended phosphorous + 2%of KTP at PI (10), DAP spray 2% at booting stage (BT) (11), KTP 2% at booting stage (BT) (12), basal application of recommended phosphorous + 2%of DAP at BT(13) and basal application of recommended phosphorous+ 2%of KTP at BT (14) . Phosphorous application either basal or foliar and their combination at various growth stages significantly increased nutrient leaf content (NPK and Fe), while decreased Zn and Na + as well as Na + /K + ratio. Also, phosphorous application significantly improved flag leaf characteristics and growth parameters at heading date viz; LAI, dry matter production, tillers numbers/hill and plant height. Phosphorous application significantly shortened the period from sowing date to heading. Yield components and rice grain yield were significantly improved by phosphorous application involving basal, foliar application and their combinations at various growth stages particularly at booting growth sage. The most and significant effective phosphorous treatments are basal application of recommended phosphorous+ 2%of DAP at BT and basal application of recommended phosphorous+ 2%of KTP at BT, whereas they were comparable regarding all above mentioned traits and recorded the maximum values of them. From economic point of view, the treatment of basal application of recommended phosphorous+ 2%of DAP at BT was the best and it could be recommended under similar conditions.
doi:10.21608/ejar.2012.160180 fatcat:ws7p7eyplreuldrpqqhow7jfla