Potassium deficiency and response of rice to its application in Hafizabad district [Pakistan]
2001
Mehdi, S.M. | Hassan, G. | Sarfraz, M. | Sadiq, M. | Hassan, N.M. | Shabbir, G. (Soil Salinity Research Inst., Pindi Bhattian (Pakistan))
Potassium deficiency symptoms were observed on rice 1999 in a number of fields throughout the Hafizabad district. Soil and plant samples from 98 rice fields showing K deficiency symptoms were collected. These soil and plant sample were analyzed for K contents. All the 98 plant samples had low K contents according-to critical limits while soil samples were tested medium in ammonium acetate (CH3-CO-O-NH4) extractable K. In the same year K was applied to rice crop @ 62.5 Kg ha-1 showing K deficiency symptoms at 11 sites. The paddy and straw yields improved from 4.17 to 36.20 % and 2.94 to 40.0 % over control by the application of K, respectively. Similarly K concentration also increased in both paddy and straw over control, by applying K, from 18.75 to 36.59 % and 6.70 to 14.46 % respectively. Potassium uptake by paddy and straw yields and total K uptake also increased by applying K over control.
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