Factors Affecting Application of Modern Agrochemicals and Observance of Pre-Harvest Interval in Khat, Catha edulis (Miraa) Crops in Igembe South Sub County
Authors: Kanyi Kithinji , Mushimiyamana David 
Published: October 2024

In Kenya, agriculture plays a crucial role in the economic development as well as alleviating poverty in the households. Strengthening the agricultural sector will call for provision of requisite extension services and ensuring necessary agricultural inputs readily available to the farmers. Evidently, agrochemicals have boosted agricultural productivity over time. Categorized broadly as fertilizers and pesticides, agrochemicals were introduced to enhance crop yields and minimize crop losses due to soil infertility, pests, and diseases. However, use of agrochemicals has been associated with various issues including effects on the environment and specifically, problems related to human health, biodiversity, and the entire ecosystem. Thus, this study investigated factors affecting application of modern agrochemicals and the observance of Pre-Harvest Interval (PHI) in Khat (Miraa) crops protection in Igembe south sub county. The specific objectives that guided the study were to investigate the effect of environmental factors on application of agrochemicals in Khat (Miraa) crops protection and whether farmers observed recommended Pre-Harvest Interval in application of agrochemicals in Khat (Miraa) crops protection in Igembe south sub county. A descriptive research design was utilized with a target population comprising Khat (Miraa) farmers in Igembe south sub county. Purposive sampling technique was adopted in selecting the sample. Stratified sampling was adopted in selecting individual respondents from the various wards to with the strata being the ward. Yamane (1967) formula was utilized to estimate the sample size of 399 respondents. Primary data was collected using a structured questionnaire with a response rate of 79.4%. Data analysis was done using Statistical Package for Social Sciences (SPSS) version 20 and presented in figures and tables. From the analysis, the correlation between environmental factors in the application of modern agrochemicals and the protection of Khat (Miraa) crops was positive and statistically significant (?=0.546, P=0.000). The regression coefficient of environmental factors in the model was positive (r=.221) and statistically significant (P=0.000). Based on the calculated averages and PHI risk factors, majority of the farmers are categorized as high risk or very high-risk users of agrochemicals. Further statistical analysis indicated that the coefficient of the risk factor is positive (r=0.572) and statistically significant (P=0.000). Therefore, the risk factor in observance of the PHI has a significant effect on the number of farmers using specific agrochemicals. The study concluded that environmental factors and non-observance of recommended PHI, positively and significantly affects the protection of Khat (Miraa) crops. The study recommends targeted extension to sensitize Khat (Miraa) growers on importance of observing recommended PHI. Finally, the study recommends that the national and county governments ought to formulate policy guidelines that identify agrochemicals suitable in Miraa crops protection, the recommended application rates, and Pre-Harvest Intervals.