ASSESSMENT OF MAJOR CHEMICAL CONSTITUENTS OF SALINE SOIL OF GRFAATER KHULNA DISTRICT

Abstract

The experiment was conducted to assess the major chemical constitunLs of saline soil. A typical saline area of Bangladesh namely Khulna (J)omoria and Ratiaghata lipazil ) , Bagherhat (Sadar and Rampal upazila) and Satkhira (Samnagar and Kaligonj upazila) districts were selected. Four villages from each upazila were selccted. The surlhce soil of 0 to 15 cm were collccted from 24 village of saline zone of greater Khulna district during the period from February to March 2010. The chemical analyses of soil constituents include total nitrogen, available phosphorus and sulphur, exchangeable ions of Na K , Ca'-t Mg2' and Cl and chemical properties such as pH, PC, SSP and SAR were determined and recorded. The pH and PC of all these soil samples varies from 4.82 to 7.56 mhos cm and 1.20 to 5.35 dSnf expressing acid to slightly alkaline and non saline to moderately saline in nature respectively. I'otal nitrogen ranged from .01 to 0.15 % at Madardia of Rampal upazila and Soondarmohal village of l3atiaghata upazila respectively. The available sulphur and phosphorus were recorded as 0.13 to 0.86 and 16.52 to 55.23 m.e/l00 g soil respectively.The dominant exchangeable cations and anion were Na', Ca2' Me, Cl' and K4 . The range of these ions were found as 1.93 to 14.13, 4.68 to 14.56, 3.03 to 5.85, 1.73 to 4.72, 0.13 to 0.60 m.e/100 g soils respectively over 24 villages of greater Khulna district. The SAR of the soil of these villages were recorded from 0.90 to 5.93 which were very sensitive to crops. The SSP of the soil samples ranged from 19 to 56%. The soils of these village were permissible to good for cultivation. The soil of I3hagmari, Noornagar and Hajipur villages were acidic, the soil of Shanpara, Ashan-Nagar, Chatchotia. Dulibola, Palit-Katti. Dakkin-Kooltali and Kooltali villages were slightly acidic, the soil of Radha-Ballop, Cioojiati, Katoora, Deema, BadraSannashi, Suto-Sannashi, Mollikaerbeard, Soondarmohal, and Kodla village were particularly neutral and the soil of Madardia village was slightly alkaly in nature.