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Lime and fertiliser applications increase yield of leafy vegetable crops in Cambodia

Citation

Hin, S and Touch, V and Lim, V and Eberhard, J and Melland, AR and McPhee, J and Jones, S and Ives, SW and Seng, V, Lime and fertiliser applications increase yield of leafy vegetable crops in Cambodia, Proceedings of The third international TropAg conference (TROPAG 2019), 11-13 November 2019, Brisbane, pp. 179. (2019) [Conference Extract]


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Abstract

Growing vegetables after rice harvest allows Cambodian farmers to use land that would otherwise be unproductive between rice crops. Producing vegetables on these soils is limited by low soil pH, low cation exchange capacity and limited nutrient retention capacity. Soil pH in the top 20 cm is generally low (pH 5.5 H2O) and may limit the availability of nutrients. Farm-based trials in Siem Reap and Kampot provinces assessed the effect of lime and fertiliser on leafy vegetable crop growth and yield. At lime-only sites, lime was applied at rates of 0.5, 1.0 and 2.0 tonnes per hectare (t/ha) in conjunction with farmer practice fertiliser rates. For sites with lime and fertiliser treatments, combinations of farmer practice and optimal fertiliser rates, no lime and 2.0 t/ha of lime were applied. Two consecutive crops were planted at one site to examine the residual effect of lime on soil pH and crop yield. At lime-only sites, all crops responded to lime application with yield increases of up to 100%. For sites that assessed combinations of lime and fertiliser, the treatment of lime and optimum fertiliser rates showed the highest yield increase (92%). Application of 2.0 t/ha lime increased soil pH by approximately 1.0 unit. This effect was still evident after a second crop of Bok Choy. For the 0.5 t/ha lime treatment, an initial soil pH increase of 0.4 units had reduced to 0.2 units after the second crop. The first crop yield was higher than the second crop yield. Long-term field trials are needed to examine residual lime effects.

Item Details

Item Type:Conference Extract
Keywords:ag lime, fertiliser rate, leafy vegetables, Cambodia, vegetable yield, soil PH
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture nutrition
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Field grown vegetable crops
UTAS Author:McPhee, J (Mr John McPhee)
UTAS Author:Jones, S (Dr Suzie Jones)
UTAS Author:Ives, SW (Dr Stephen Ives)
ID Code:139026
Year Published:2019
Deposited By:TIA - Research Institute
Deposited On:2020-05-22
Last Modified:2021-07-08
Downloads:0

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