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UNIVERSITETET FOR MILJO - OG BIOVITENSKAP (NORWAY) Norvège (2005)

Integrated plant nutrient management in crop production in the Central Ethiopian highlands

Bune, Balesh Tulema

Titre : Integrated plant nutrient management in crop production in the Central Ethiopian highlands

Auteur : Bune, Balesh Tulema,

Université de soutenance : UNIVERSITETET FOR MILJO - OG BIOVITENSKAP (NORWAY)

Grade : Doctor of Philosophy (PhD) 2005

Résumé
There is a paucity of information on nutrient balances at farm and plot levels in Ethiopia. A nutrient balance study was undertaken on farms in Central Ethiopia in order to assess the banances and identify areas of intervention. One important finding is that the scale of the nutrient balance studied is significant. The nutrient balance at the farm level is more positive than at the plot and crop level. The nutrient balance at the farm level was -9 kg N, + 11 kg P and +62 kg K ha sup(-1) yr sup(-1). Among the farms, N was more depleted on poor household farms, whereas medium wealth group household had more P and K accumulation. The positive balances found are due to accumulation of organic inputs, such as manure and household waste at disposal sites in the homestead. The nutrient balance was in general more negative for the poor and very poor fertility soils as compared to the soils of good and medium soil fertility. Mean balance in different soil fertility group classes was -79 kg N ha sup(-1), -18 kg P ha sup(-1) and -95 kg K ha sup(-1) yr sup(-1). The highest depletion was in very poor fertility soils of the medium wealth households. Good and medium fertility soils are planted mostly with high value crops, such as tef and wheat receive the highest nutrient input. Nutrient depletion varied between the crops. Nutrient depletion was most severe on grasslands.

Mots clés : AGRICULTURE, SOIL SCIENCE ; AGRICULTURE, AGRONOMY ; ENVIRONMENTAL SCIENCES

Présentation (AGRIS)

Présentation (NORAGRIC)

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