Status and availability of potassium to rice [Oryza sativa] plant in tidal swampy soil in the tropics
1999
Hadi, A. (Lambung Mangkurat Univ., South Kalimantan (Indonesia)) | Nohoi, G. | Arifin. | Inubushi, K.
The status and availability of potassium to rice plant in a tidal swampy soil in the tropics were studied in field and greenhouse experiments carried out in South Kalimantan, Indonesia. Experiments were conducted using the Nested Completely Randomized Design (CRD) in order to analyst the effect of tidal movement on the status of soil potassium and its availability under different levels of salinity. The results suggested that the content of potassium in soil varied among the locations and was affected by the tidal movement. It was observed that the less pronounced the tidal influence, the higher the content of soil potassium. Salinity significantly affected the top dry weight and the shoot length of rice as well as the amount of potassium absorbed by rice. Salt concentration of 5.5g kg(-1) dry soil or higher strongly suppressed the growth of rice except for the plants subjected to heavy potassium fertilization (0.6g potassium kg(-1) dry soil). Salinity exceeding 8.8 g kg(-1) dry soil seemed to adversely affect the potassium uptake by rice in the tidal swampy soil. Calcium activity was the best indicator among those examined in this study for potassium availability to rice in tidal swampy soil, followed by the ionic strength of the soil solution. Therefore inorganic salt addition as fertilizer or lime in tidal swampy soil should be limited to less than 5.5g kg(-1), dry soil and the antagonistic effect of cations which may be present at higher, salt concentrations should b
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