ater treatment props used in the learning process is intended to clarify the material presented lectures more interesting and easier to understand. How much influence the process of learning to use and not use props is a water treatment in this study.Analytical study of the design of one group pretest-posttest conducted with a sample of Environmental Health Prodi third semester students during the academic year 2014/2015 in themonth of September until November 2014. Students of 51 people divided into two groups A and group B were based on the averagevalue of the first semester GPA (a) and II (two) are intended to have the same ability level andevenly. Group learning process does not use props and group B with the use of props watertreatment. The results of students' pre-test group A and B do not pass the value of the gain and thehighest and lowest 50 20. While the results of a group of students posttest score average of 67.3, the lowest and highest value of 60.7 79.3. The student group B average value 78.3, the lowest value of 70, and the highest 84.7. There are significant differences utilize the learning process and not use props.The above data indicate that the level of understanding of the students in the lecture using props are better than without props. Konfrehensif cognitive abilities and effective student group Bwas also better. Props water treatment also allows professors to teach and improve communication skills for students. Thus, each subject-oriented knowledge and skills needed innovation of scienceand technology major props adequate.

ABSTRAKTreatment of cattle wastes is one effort that is quite beneficial and can reduce the negative impacts on the environment. One way of utilizing livestock manures or organic materials is through the use of biogas. This is rather appropriate since majority of the population reside in rural areas. Meanwhile, the waste generated out of the biogas digester can be used as liquid organic fertilizer (LOF) with high nutrient contents suitable for plants .Thisexperimental studywasaimedtodeterminethecontentofnitrogen(N),phosphorus(P), potassium(K),andsulphur(S)asaLiquidOrganicfertilizer(LOF).Thisinvestigationwasrunusing one group pretest posttest design. Raw cow dung was processed in biogas digesters ( max 3 m3 ; with detentiontime(t4)of7days,14daysand21 days,andthecontentofN,P,K,Swill bemeasured before and after the process in the digester.In the examination before the process, the N content ( 0.10 o/o ), P content ( 1.13 7o ), content of K ( 0.59 % ) content of S ( 1.19 o/o ). After theT ,14 and 21 days the N content increased from its original state. Thehighestincrementwasatday2t,withalargeincreaseof(41.2%).TheelementP(td)7,!4and 21 days have shown a continuous decline and the highest was on day 2t that reached ( 30.08 o/o ). For elements of K and S for ( td )7 , t4 and 21 days have continuously increased. The highest generation rate of the element K on day 21 reached ( t5.7 o/o ) and S reached ( 43.6 o/o ). It appeared that the longer the process in the digester, the N, K and S contents is increasing although it remained below the standard designated in Permentan 28 / Permentan / OT.140 / 212009. While the P element on the contrary was decreasing and there were indications of the longer the process in the digester the greater the decline.This indicated that the P element much needed by the bacteria in the fermentation process. An increase in the content of N, K and S as a nutrient for plant growth as generated by the biogas digester using raw manure in this study have met the LOF requirements. Effectiveness in lmproving N, P , K and S contents required futher research on the type of starter bacteria to be used, duration of the process ( td ) and the ratio of water and cow dung in order to obtain the most effective and efficient results.