VARIABILITY OF WATER AND SOIL CHARACTERISTICS WITHIN A PRODUCTION CYCLE IN AN ALTERNATIVE SHRIMP-PADDY CULTIVATION PLOT IN KHULNA, COASTAL BANGLADESH

Muhammad Abdur  Rouf; S.M. Masud  Karim; A.F.M.  Hasanuzzaman; Khandoker Qudrata  Kibria; Md. Ayaz Hasan  Chisty

doi:10.53808/KUS.2007.8.2.0727-L

Authors

Muhammad Abdur Rouf Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh
S.M. Masud Karim Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh
A.F.M. Hasanuzzaman Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh
Khandoker Qudrata Kibria Soil Science Discipline, Khulna University, Khulna 9208, Bangladesh
Md. Ayaz Hasan Chisty Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

DOI:

https://doi.org/10.53808/KUS.2007.8.2.0727-L

Keywords:

Nutrient, land use management, coastal region, shrimp culture, water, soil

Abstract

A six months study was carried out in an alternative shrimp paddy cultivation plot situated in Khulna District, Bangladesh. In soil, the mean values of sodium (Na) 13.33 mg l^-1, calcium (Ca) 42.12 mg l^-1, potassium (K) 472.50 mg l^-1, iron (Fe) 1.01 mg l^-1, phosphorus (P) 7.05 mg l^-1, sulfur (S) 46.67 mg l^-1, ammonium-nitrogen (NH₄⁺-N) 247.68 mg l^-1, nitrate-nitrogen (NO₃^--N) 114.78 mg l^-1, pH 8.09, Electric conductivity (EC) 4.45 ms m^-1, redox potential (Eh) -63.65 mv and organic carbon (OC) 2.56% were observed. Whereas in water, the mean values were found as Na (1051.25 mg l^-1), Ca (400.00 mg l^-1), K (135.50 mg l^-1), Fe (0.75 mg l^-1), P (1.626 mg l^-1), S (283.75 mg l^-1), NH₄⁺-N (43.05 mg l^-1), NO₃^--N (17.64 mg l^-1), pH (8.29), EC (35.30 ms m^-1), Eh (-73.08 mv). Except Ca and S, P, Na, K, Fe, NH₄⁺-N, NO₃^--N, EC and Eh were increased over the culture period of shrimp. The value of pH was decreased gradually in water and increased in soil. Insignificant monthly variation in most of parameters measured except water Fe, soil Ca and soil NO₃^--N indicate that present alternative shrimp-paddy cultivation practice has no significant impact on the plot.

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