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• W73851781 abstract "Fertiliser use in agriculture increased rapidly during the green revolution and global fertiliser use increased by about 310% from the mid-1960s to the end of the 1980s. Nutrient management in Vietnam was not part of this development until after the start of the reform policy ‘doi moi’, which entailed the introduction of new crops and new fertilisers, increased the consumption of mineral fertilisers, and led to higher yields, but also possibly to higher losses of nutrients to the environment. This development is most pronounced in the peri-urban areas and the densely populated river deltas (the Red River delta and the Mekong River delta). The objective of this thesis was to investigate the existing nutrient management in a peri-urban village northwest of Ho Chi Minh City in southern Vietnam and to elucidate the farmers’ underlying rationale. Nutrient management was assessed by nutrient balances and flows on 9 representative farms containing one or more of the following production units: pigs, crops, and fish. The data were gathered through interviews and chemical analysis of inputs and outputs. Participatory methods were used to gather information on the farmers’ concepts about soil fertility and fertilisers and their access to information. The results from the nutrient balances showed that the farming systems investigated were high nutrient input systems and that there was generally poor nutrient use efficiency both at farm and field level. On the livestock farms nutrient input ranged from 209 to 2113 kg N, 76-771 kg P and 84-1167 kg K ha-1 year -1. On the stockless farms the figures were generally somewhat lower, i.e. 38-928 kg N, 25-656 kg P, and 32-486 kg K ha-1 year -1. Except in one rice field, the nitrogen balances at field level were positive in all cases, with surpluses of between 31 to 1736 kg N ha -1 and year. The P balances were positive in all fields with surpluses of between 20 to 1292 kg P ha-1 and year, while the K balances were somewhat lower with surpluses of 9 to 913 kg K ha-1 and year, and negative in one rice field and one orchard. The positive farm balances on livestock farms could to some degree be explained by the high livestock density and poor use of the excreta from livestock production. The positive balances at field/crop level could be explained by the farmers’ concept of fertilisers which included a wide range of amendments added to promote good conditions for plant growth. The farmers’ concept of fertilisers did not comprise the nutrient flow, which may indicate that the farmers did not know that their nutrient management created nutrient surpluses. Instead they perceived that they fertilised too little, due to low investment capacity resulting from the unstable market. However the economic inputs were only 5-10% of the income from crop harvest, although they were slightly higher for high-income crops (e.g. jasmine and vegetables) and newly established orchards. The positive nutrient balances may pose an environmental hazard and suggested measures to improve nutrient management were to make the nutrient flow transparent to the farmers by providing information on the nutrient content of different fertilisers as well as the nutrient requirement of the crop. For livestock farms it is also important to make better use of liquid excreta and to spread solid manure on larger areas than today." @default.
• W73851781 created "2016-06-24" @default.
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• W73851781 date "2003-12-01" @default.
• W73851781 modified "2023-09-23" @default.
• W73851781 title "Nutrient management in smallholder peri-urban farming systems" @default.
• W73851781 hasPublicationYear "2003" @default.
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