The objective of this study is to determine the effectiveness of the agricultural model supported with worksheets developed by the researchers based on the 5-E model of constructivist learning theory, taught as an elective course in the second grade of the primary school, on students' conceptual developments. For this purpose, a semi-experimental research method was used. While the experimental group consisting of 29 students was taught with the developed agricultural module, the control group consisting of 19 students was taught with the teacher's own lesson materials. It was seen that although the pre-test results obtained from the Conceptual Perception Test were very similar to each other, at the end there was a remarkable difference (t ((46))= 3.472: p<0.05) in terms of the experimental group results. We see from the results that the students who took the agriculture course via the developed agricultural model become more successful and teaching materials within the developed model has an effect in developing students' conceptual understanding of the agricultural concepts at the six level curriculum programmes.