Run-off water harvesting for dry spell mitigation in maize (Zea mays L.): results from on-farm research in semi-arid Kenya
作者： Jennie Barron , George Okwach
DOI: 10.1016/J.AGWAT.2004.11.002
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摘要: Abstract Maize (Zea mays L.) yields obtained by small-holder farmers in semi-arid zones sub-Sahara Africa (SSA) are often less than half of potential yields. Water deficit during critical crop growth stages together with low nutrient input interacts to reduce Collection surface run-off, which could be used as supplemental irrigation may prove beneficial improving current farming system SSA. This paper presents the results an on-farm study effects (SI) on maize yield Kenya. Surface run-off from a catchment 2.7 ha was harvested hand-dug earth dam 300 m2. The water supplied gravity mitigate dry spells fertilized (SI30, SI80 kg N ha−1) and non-fertilized (SI0 kg N ha−1) maize. Treatments SI were compared non-irrigated treatments (NI80, NI30, NI0 kg N ha−1). Rainfall varied, five seasons study, 196 564 mm. volume ranged between 1% 4% seasonal rainfall. outtake for varied 20 240 mm per season. Seepage losses accounted 11 74% water. Lowest NI0, representing farmers’ practise. fertilizer increased fertilised (NI30, NI80) rainfall ( 300 mm) resulted no increase NI. Mean grain (30 or 80 kg N ha−1) 1796 kg ha−1 significantly higher (P
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