Publications des agents du Cirad

Cirad

Labour burden not crop productivity increased under no-till planting basins on smallholder farms in Murehwa, Zimbabwe

Rusinamhodzi L., Corbeels M., Nyamangara J., Giller K.E.. 2012. In : CIAT. Integrated Soil Fertility Management in Africa: from Microbes to Markets, Nairobi, Kenya, 22-26 october 2012. s.l. : s.n., p. 102-102. Integrated Soil Fertility Management Africa, 2012-10-22/2012-10-26, Nairobi (Kenya).

No-till planting basins are promoted using seed and fertiliser inputs as incentives for their widespread uptake in Zimbabwe. Notill planting basins are planting holes measuring 15 cm width x 15 cm length x 18-20 depth, spaced 60 cm within the row and 75- 90 cm between rows leaving up to 90% of the soil surface undisturbed. They are intended to conserve moisture and improve the targeting of nutrient application. We evaluated the effect of planting basins on crop yield and labour requirement in an on-farm experiment over two seasons in Murehwa district, Zimbabwe. The experiment was established in clay and sandy soils, in two fields types; degraded and better managed fields in 2009/2010 and 2010/2011 seasons. Two tillage treatments i.e mouldboard ploughing and no-till planting basins were tested. Tillage plots measured 1080 m2 (18 m x 60 m) and labour hours were derived by direct measurement in these plots. Due to grazing in the dry season, soil surface cover by crop residues in the experimental fields was less than 10% in both seasons. Previous field management, nutrient management in the experiment and season had a significant effect on crop yields (p <0.001); there was no significant effect of tillage. The largest maize grain yield of 5.6 t ha-1 was obtained with a combination of 3 t of manure and 60 kg N ha-1 under conventional tillage the equivalent treatment under planting basins yielded 4.6 t ha-1 in the 2009-2010 season. Rainfall was poorly distributed in 2010-2011 season and the same treatment gave the largest grain yield of 1.6 t ha-1 under conventional tillage and 1.2 t ha-1 under no-till planting basins. Land preparation under conventional tillage required 6 man days ha-1 while making planting basins required 27 man days' ha-1 for the clay soils and 15 man days ha-1 for the sand soils. Weeding in planting basins required 40% more labour compared with conventional tillage (12 man days ha-1) due to greater weed densities associated with no-tillage. Plantin

Documents associés

Communication de congrès

Agents Cirad, auteurs de cette publication :