Browsing by Author "Wanjogu, Raphael"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Publication
    Improving crop productivity and water use efficiency in basin rice cultivation in Kenya through SRI
    (International Journal of Agricultural Science Research., 2012-05-23) Nyamai, Matolo; Mati, Bancy Mburia; Home, Patrick Gathogo; Odongo, Benson; Wanjogu, Raphael; Thuranira, Elias
    Improving the yield of rice (Oryza sativa L) in existing irrigated areas rather than further expansion is more likely to be the main source of growth for the crop in Kenya, especially due to limited land and water resources. In order to achieve this, there is need to identify and adopt solutions that are environmentally more sustainable. That is, the production systems adopted should reduce water consumption and increase productivity. This study evaluated whether the System of Rice Intensification (SRI) could increase water use efficiency and crop productivity relative to the conventional production system of continuous flooding. The effects of SRI on total water input and the growth characteristics of three rice varieties were investigated in a split-plot factorial at the experimental farm of the Mwea Irrigation Scheme of Kenya during the August - December 2009 growing season on vertic clay soils. The production practices of SRI were found to be beneficial to rice growth. SRI gave higher average grain yield (14.85 t/ha) than the conventional production system (8.66 t/ha) at P=0.006, while the average yield across production systems was 15.89 t/ha, 11.26 t/ha and 8.10 t/ha for BW196, NERICA1 and Basmati370 varieties respectively, with P
  • Thumbnail Image
    Publication
    Integrating Mechanical Weeding and Planting for Reduced Labour Input in Paddy Rice under System of Rice Intensification (SRI)
    (Scientific Research Publishing (SCIRP)., 2019) Kathia, Mercy Kangai; Mati, Bancy; Ndiiri, Jackline; Wanjogu, Raphael
    The System of Rice Intensification (SRI) has been attributed to improvement in rice production with various attributes being accrued from application of the SRI Principles. The most notable are savings on water use and increase in yield. Alternate Wetting and Drying (AWD) has also paved way for mechanical weed control in paddy fields. One of the major constraints to adoption of SRI is the perceived increased labour input due to the careful transplanting and frequent weed control. This paper evaluates the effect of mechanization on labour input in SRI in comparison to the less mechanized farmer practice. In attempt to reduce drudgery in transplanting under SRI, the drum seeder was used to establish the rice crop by direct seeding. This was then followed by using SRI practices i.e. AWD and mechanical weeding. Direct seeding using a drum seeder was compared to transplanting in both SRI and the common farmer practice. Hand weeding was also evaluated and compared to mechanical weeding. Labour input cost was also compared to the income accrued from the yields. From the study, it was noted that direct seeding using the drum seeder reduced labour input by 97% compared to transplanting. This was possible in that in direct seeding, and there was no nursery preparation and management as in transplanting. The use of a mechanical weeder reduced labour input by 28.3% in relation to hand weeding. Labour input cost for SRI was cheaper (Kshs. 124,080 per hectare) compared to the common farmer practice (Kshs. 139,117.50 per hectare). There was more yield from the SRI practice (2.75 Ton/ha) compared to the common farmer practice (1.88 Ton/ha).