Effect of poultry manure on the growth and yield of leaf mustard (Brassica juncea) and lettuce (Latuca sativa) grown on bris soil

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Parent Category: 2016

A.H. Lim

Abstract

Two leafy vegetables i.e. leaf mustard (Brassica juncea) and lettuce (Latuca sativa), were grown on a coastal sandy soil (bris) with increasing rates of poultry manure (PM), with and without inorganic fertiliser (IF). The rates of PM applied were 0, 10, 20, 30 and 40 t/ha and IF (N:P 2O5:K2O = 12:12:17:2) was applied at the rate of 1 t/ha, giving altogether 10 treatments. For both vegetables, 10 t/ha PM gave higher yields than IF alone. Yields obtained with PM as the sole source of nutrients ranged from 62 – 96% of the yields with PM + IF for leaf mustard and 88 – 113% for lettuce. Yield responses to increasing rates of organic fertiliser for leaf mustard showed a quadratic trend represented by the equation Y = –0.0181x2 + 1.0534x + 2.5537. The optimum rate of poultry manure was 29.1 t/ha and the yield obtained was 17.9 t/ha. For lettuce, the yield response is represented by the equation Y = –0.0067x2 + 0.6239x + 6.6947. The optimum rate of poultry manure was 46.6 t/ha and the yield obtained was 21.2 t/ha.

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