Management of mangrove forest soils for agriculture
1987
Yongyuth Osotsapar (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture) | Viruch Suksaran | Arunsiri Kamlung
Study is in connection with the second part (1981) and the third part (1982) of the project which aimed at gaining more information on the influence of sodium chloride treatments on ions accumulation in rice and soybean. The concentration of sodium and chloride ions in stem with leaf sheath and leaf blades of rice significantly increased with increasing NaCl levels in the soils. The sodium and chloride concentration of stems and leaf sheaths is markedly higher than leaf blades. Salinity also influenced the concentration of nitrogen phosphorus, potassium, calcium and magnesium in rice shoots. The concentration of these ions in plant tissue could not be considered as deficient or toxic levels for rice. Increasing the phosphate concentration in the soil caused the increase of phosphorus and magnesium but decreased sodium and chloride concentration in rice shoot. Sodium and chloride content of stems, leaves and roots of rice increased progressively with increasing sodium chloride levels. The plant tended to accumulate more chloride than sodium ions. The chloride concentration in rice roots was remarkably higher than that in leaves and stems. The addition of sodium chloride to the soil significantly influenced the nitrogen, phosphorus and potassium content in soybean leaves, stems and roots. However, the concentration of such primary elements of salt treated plants are still considered sufficient for normal growth. It was also noted that phosphate and chloride concentration in soybean tended to increase with the addition of phosphate fertilizer.
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