ANALYSIS OF SOCIO-ECONOMIC AND INSTITUTIONAL FACTORS INFLUENCING SMALLHOLDER FARMER ADOPTION OF SOIL AND WATER CONSERVATION PRACTICES ON MAIZE PRODUCTION, THARAKA NITHI COUNTY, KENYA

Abstract

Maize is among the most significant crops in Kenya for food security. Soil and water conservation practices adopted in maize production offer a potential solution to combat climate change by enhancing soil productivity and decreasing soil and water erosion thereby enhancing crop productivity and smallholder farmer’s farm income. Despite various interventions to practice improved soil and water conservation technologies (SWCs) in maize production, adoption of these technologies is low resulting to poor output due to various factors. Therefore, this study aimed at analyzing the socio-economic and institutional factors influencing the adoption of SWCs and subsequent effect on maize yield in Tharaka Nithi County, Kenya. A cross-sectional survey research design was used where multi-stage sampling method was applied. Three hundred and eighteen (318) households in Maara and Chuka Sub-Counties were interviewed from a population target of 5250 using a structured questionnaire to obtain data on socio-economic and institutional factors influencing the uptake of SWCs. Descriptive statistics were completed using SPSS version 28 while econometric analysis by Stata version 17. The Propensity Score Matching model (PSM) was employed on the effects of adoption of SWCs on maize yield while Multivariate Probit (MVP) model was employed on both socio-economic and institutional factors affecting the use of SWCs. The MVP model had positive coefficients which indicated that increase in either one of socio-economic and institutional factors increased the adoption of certain SWCs, farm size had a P-value at 1% on intercropping and irrigation, household size P-value at 5%, land topography a P-value at 5% on intercropping, grass strips and stone bunds, extension and training a P-value at 1% on intercropping and grass strips and membership P-value at 1% on intercropping and irrigation. The negative coefficients showed that increase in the factors decreased the adoption of certain SWCs, gender had a P-value at 5% on intercropping and P-value at 10% on mulching, education at 1% on minimum tillage and 5% on stone bunds, perception on soil erosion had a P-value at 1% on intercropping and irrigation and topography of the land had a P-value at 5% on crop rotation. The PSM model applied the logit regression model where positive estimates on socio-economic and institutional factors showed an increase in either of the factors had an increase in adoption of SWCs indicating significance on age at 5% on mulching, household size at 5% on intercropping, land size at 5% on irrigation, extension services at 1% on crop rotation and group membership at 10% on irrigation that influenced adoption of SWCs. The negative coefficients indicated that an increase in either of the factors decreased the adoption of SWCs where land size had a P-value at 5% on grass strips, household size had a P-value at 10% on terraces, age had a P-value at 10% on crop rotation and irrigation, access to extension services had a P-value at 1% on grass strips and group membership had a P-value at 1% on terraces. The PSM used three matching algorithms (Nearest neighbor, radius and stratification) to match the adopters and non-adopters that determined the Average Treatment Effects (ATT). Intercropping and irrigation were positively significant at 5% and 1%, respectively. The positive ATT indicated an average increase in maize yield from intercropping and irrigation as soil and water conservation practices (SWCs) at a range between 290 kgs to 375 kgs and 270 kgs to 725 kgs per hectare, respectively. Stone bunds and minimum tillage were negative and significant at 1%. The negative ATT was significant and showed that there was average decrease in maize production from stone bunds and minimum tillage as SWCs at a range of about 50 kgs to 287 kgs and 248 kgs to 690 kgs per hectare, respectively. The adoption level of SWCs was average given that there was low frequency of implementation by the smallholder maize farmers. Therefore, the study recommends that small-scale maize producers should practice more of intercropping and irrigation as SWCs for increased productivity and increased food security. There is also the need for government and stakeholders’ interventions which will enable small-scale maize farmers to increase on adoption of SWCs that results to improvement in crop output and income.