Raising the productivity of smallholder farms under semi-arid conditions by use of small doses of manure and nitrogen: a case of participatory research |
| |
Authors: | B Ncube J P Dimes S J Twomlow W Mupangwa K E Giller |
| |
Affiliation: | (1) Plant Productions Systems, Department of Plant Sciences, Wageningen University, Box 430, 6700 AK Wageningen, The Netherlands;(2) International Crops Research Institute for the Semi Arid Tropics (ICRISAT), Box 776, Bulawayo, Zimbabwe |
| |
Abstract: | Participatory on-farm trials were conducted for three seasons to assess the benefits of small rates of manure and nitrogen
fertilizer on maize grain yield in semi-arid Tsholotsho, Zimbabwe. Two farmer resource groups conducted trials based on available
amounts of manure, 3 t ha−1 (low resource group) and 6 t ha−1 (high resource group). Maize yields varied between 0.15 t ha−1 and 4.28 t ha−1 and both absolute yields and response to manure were strongly related to rainfall received across seasons (P < 0.001). The first two seasons were dry while the third season received above average rainfall. Maize yields within the
seasons were strongly related to N applied (R
2 = 0.77 in season 1, and R
2 = 0.88 and 0.83 in season 3) and other beneficial effects of manure, possibly availability of cations and P. In the 2001–2002
season (total rainfall 478 mm), application of 3 and 6 t ha−1 of manure in combination with N fertilizer increased grain yield by about 0.14 and 0.18 t ha−1, respectively. The trend was similar for the high resource group in 2002–2003 although the season was very dry (334 mm).
In 2003–2004, with good rainfall (672 mm), grain yields were high even for the control plots (average 1.2 and 2.7 t ha−1). Maize yields due to manure applications at 3 and 6 t ha−1 were 1.96 and 3.44 t ha−1, respectively. Application of 8.5 kg N ha−1 increased yields to 2.5 t ha−1 with 3 t ha−1 of manure, and to 4.28 t ha−1 with 6 t ha−1 of manure. In this area farmers do not traditionally use either manure or fertilizer on their crops, but they actively participated
in this research during three consecutive seasons and were positive about using the outcomes of the research in future. The
results showed that there is potential to improve livelihoods of smallholder farmers through the use of small rates of manure
and N under semi-arid conditions. |
| |
Keywords: | Cattle manure Maize yields Nitrogen fertilizer On-farm research Smallholder farming |
本文献已被 SpringerLink 等数据库收录! |
|