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035 _a.b11899153
099 9 _aAIT Thesis no.AS-06-18
100 1 _aRatnayake, Willoram Mudiyanselage
245 1 0 _aAssessment of variation in soil quality and land productivity in coconut-pineapple under-storey cropping systems in Sri Lanka
260 _aPathum Thani, Thailand :
_bAsian Institute of Technology,
_c2006
300 _a92 leaves :
_bill.
490 1 _aThesis ;
_vno. AS-06-18
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment Resource and Development
502 _aThesis (M.Sc.) - Asian Institute of Technology, 2006
520 _aCoconut is a high income crop in Sri Lanka, yet its nut yield and income are affected due to unforeseen stresses that encounter during its nut development period. Reduced income is compensated by growing pineapple as an under-storey crop. Although pineapple brings high incomes, the growers face varying problems including fertility declines. This study was conducted to investigate the effect of pineapple association on the soil fertility and land productivity in coconut lands in Sri Lanka. The study was a field survey for information and soil sample collection cum laboratory analysis of soil samples collected from representative cropping systems adopted sites. Three coconut growing regions, namely Kuliyapitiya, Kurunegala and Lunuwila were selected for the study. Soil samples from 0-15 and 15-30 cm depths in the coconut lands were collected and analyzed for soil physical and chemical properties. Bulk density in the upper 30 cm soil profile in all treatments ranged from 1.1 to 1.3 g/cm3. Total N content in pineapple sites was significantly higher compared to that of coconut monoculture and one year after removal of pineapple. The overall fertility status indicates that bulk density is in the medium range, pH is medium in the monoculture, and lower than 5.1 (alarming) in the pineapple grown lands. Organic C and total N are very low in all cropping systems including coconut monoculture. Calcium is low in all cropping systems including monoculture, while P is very high in all cropping systems including coconut monoculture and Mg is very high in coconut monoculture and medium in pineapple grown lands. Potassium is medium in coconut monoculture, medium in 3 and 4 years in pineapple grown lands and low during the rest of the period. The coconut yield was significantly higher in monoculture lands. The low nut yield reported by growers in their lands assigned to pineapple showed an increase overtime in the presence of pineapple. However, nut yield showed a rapid decline after removal of pineapple. Pineapple was also shown to be over-crowded during the second-year onward and enhanced it competition
650 0 _aCoconut
_zSri Lanka
650 0 _aPineapple
_zSri Lanka
650 0 _aSoils
_zSri Lanka
_xQuality
700 1 _aRanamukhaarachchi, S.L.,
_eChairperson
700 1 _aJayasuriya, H.P.W.,
_eExamination Committee
700 1 _aClemente, Roberto S.,
_eExamination Committee
710 2 _aNORAD AIT Fellowship,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. AS-06-18
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B09888
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