Effect of organic amendment and chemical fertiliser on growth, yield and fodder quality of a forage sorghum (Sorghum bicolor L. Moench)

Pholsen, S.; Suksri, A.

Pakistan Journal of Biological Sciences 7(4): 651-657

2004


ISSN/ISBN: 1028-8880
Accession: 004124852

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Abstract
This study was conducted at the Khon Kaen University Experimental Farm, Northeast Thailand during June-September 2000 to investigate effects due to application of organic amendment and chemical fertilizer (15-15-15 and 13-13-21 NPK) on growth, yield and fodder quality of a forage sorghum, IS 23585 cultivar (Sorghum bicolor). The experiment consisted of nine treatments and was laid in a randomized complete block design with four replications. The results showed that the application of chemical fertilizer significantly increased total dry weight ha-1, stem dry weight, leaf dry weight, leaf area/plant and leaf area index (LAI) of the sorghum plants. The application of chemical fertilizer plus organic amendment, in most cases, gave significantly greater growth parameters, than adding chemical fertilizer alone. Total dry weight and seed yield were significantly correlated to leaf area duration (D). Crude protein (CP) significantly increased with an application of chemical fertilizer alone and chemical fertilizer, plus organic amendment. All treatments had no significant effect on neutral detergent fibre (NDF), acid detergent fibre (ADF) and dry matter degradability (DMD). The highest total dry weight was attained from the highest rate of chemical fertilizer (15-15-15) plus cattle manure (14 595 kg ha-1), whilst the highest seed yield was obtained from the highest rate of 13-13-21, plus municipal compost (3055 kg ha-1).