تلخیص
Potassium (K) deficiency in the soils of Pakistan is spreading rapidly and thus has become one of the most nutritional limiting factars for increasing rice yield ta feed the avergrawing papulation. Exploitation af 8enetic potential through screening could be an important technique to find out K efficient rice genotypes which might perform better under deficient K regime. In this stud y, 26 rice (Oryza sativa L.) genotypes were tested in rain protected environment under nutrient solution at low (0.3 mM) and adequate K (3.0 mM) levels to examine the various growth attributes like shoot fresh weight (SFW), root fresh weight (RFW), total fresh weight (TFW), root shoot ratio (RSR) and K stress factor (KSF). The crop was harvested at 25 days afier transplanting. SFW ranged from 0.52 to 4.18 g 2plant!' (deficient K level) and 1.65 to 11.53 g 2plant!' (adequate K level). RFW ranged from 0.07 to 0.30 8 lant!’ (deficient K level) and 0.10 ta 0.57 8 !plant!’ (adequate K level). Contrasting variation in KSF was observed in 49807 (32 No) and 81Wo in 527773-2. Marked differences for biomass production were observed among all the rice genotypes indicating a wide 8enotypic variation which may imply an opportunity for the genetic improvement under law K status. The two rice genotypes 99509 and 49818 performed best under deficient K level with respect to al! 8rowth parameters and therefore, can be used for future breeding purposes and field experimentation.
M. Arim M, M. Arshad ,, A. Khalid, A. Hannan. (2008) Differential response of rice genotypes at deficient and adequate potassium regimes under controlled conditions, The Journal Soil & Environment , Volume 27, Issue 1.
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