Articles
LETTUCE (LACTUCA SATIVA L.) AND CABBAGE (BRASSICA OLERACEA L.VAR. CAPITATA L.) GROWTH IN SOIL MIXED WITH MUNICIPAL SOLID WASTE COMPOST AND PAPER MILL SLUDGE COMPOSTED WITH BARK
Article number
563_16
Pages
131 – 137
Language
English
Abstract
Crop responses to soil amended with municipal solid waste compost and paper mill sludge composted with bark was investigated in pot experiments using lettuce (Lactuca sativa L) cvs.
Animo and Jory and summer cabbage (Brassica oleracea L. var. capitata L) cv.
Lima.
Dry matter accumulation generally increased with increasing concentrations of composted paper mill sludge.
Municipal waste compost severely reduced plant growth compared to composted paper mill sludge, and caused complete crop mortality unless leached beforehand with water.
The main cause of death or growth inhibition of experimental plants observed with municipal solid waste compost is likely to be the result of its poor stability and high electrical conductivity.
Lettuce dry matter accumulation increased when composted paper mill sludge treatments were amended with ammonium nitrate up to between 0.1 and 0.2 g N l-1 but declined with further amounts. Dry matter accumulation of lettuce and nitrogen accumulation of cabbage could be described as a function of compost nitrogen content and electrical conductivity.
Possible methods for improving the characteristics of such composts as substrates for horticultural crops are discussed.
Animo and Jory and summer cabbage (Brassica oleracea L. var. capitata L) cv.
Lima.
Dry matter accumulation generally increased with increasing concentrations of composted paper mill sludge.
Municipal waste compost severely reduced plant growth compared to composted paper mill sludge, and caused complete crop mortality unless leached beforehand with water.
The main cause of death or growth inhibition of experimental plants observed with municipal solid waste compost is likely to be the result of its poor stability and high electrical conductivity.
Lettuce dry matter accumulation increased when composted paper mill sludge treatments were amended with ammonium nitrate up to between 0.1 and 0.2 g N l-1 but declined with further amounts. Dry matter accumulation of lettuce and nitrogen accumulation of cabbage could be described as a function of compost nitrogen content and electrical conductivity.
Possible methods for improving the characteristics of such composts as substrates for horticultural crops are discussed.
Authors
L.M. Brito
Keywords
ammonium nitrate, DW, electrical conductivity, N uptake, nitrogen
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