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Nurmaya, Eka
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Physics

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Soil Quality Analysis for Dryland Agriculture with Variation of Fertilization and Plant Rotation in Argomulyo District, Salatiga City Nurmaya, Eka; Fianti, Fianti; Yulianti, Ian
Physics Communication Vol 6, No 1 (2022): February 2022
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/physcomm.v6i1.33976

Abstract

The study aim is to analyze soil quality for dryland agriculture with variations in fertilization and plant rotation in Argomulyo sub-district, Salatiga city. This study took samples on dryland agricultural land in Ledok Village by taking sample points using random sampling with a cluster sampling pattern by dividing them into 4 clusters. The Step of the research are field and laboratory observation to know the soil pH and moisture, also to determine the soil value and cation test, respectively. Next is the interview step to know the effect of fertilization and plant rotation variation. This research uses quantitative description analysis techniques. Based on the field observation was obtained the cluster 2 has pH value around 6.5 in the category slightly acidic. Then, for cluster 1,3, and has 4 neutral pH category in the range 6.6 – 7.5. The humidity of clusters in the dry category is in the range of 0 - 30%. Laboratory observation shows cluster 3 has a lower resistance around 8.1KW and has the best cation exchange capacity (CEC) test compared with other clusters. Based on the results of interviews, cluster 2 received organic fertilization and crop rotation occurred. Clusters 1 and 4 have not received any planting activity since October 2020. Meanwhile, fertilization in cluster 3 uses inorganic fertilizers. So Cluster 2 soil quality is better than the other three clusters due to organic fertilization and plans rotation so that the soil nutrients become stable. Cluster 1 has poor soil quality due to variations in inorganic fertilization, neglecting the soil, and being planted Manihot esculenta which impacted the reduction in the amount of nitrogen and phosphorus in the land.
Development of Cognitive Ability Test Instrument Based on Revision Bloom Taxonomy on Dynamic Electricity Materials For Students of Senior High School Nurmaya, Eka; Rusilowati, Ani; Astuti, Budi
Physics Communication Vol 6, No 2 (2022): August 2022
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/physcomm.v6i2.37028

Abstract

This study aims to develop a cognitive ability test instrument based on Bloom's taxonomy revision. The test instrument covers the cognitive domains C1 (remembering), C2 (understanding), C3 (applying), C4 (analyzing), C5 (evaluating), and C6 (creating). The research was carried out using research and development methods using a 4-D development model (Define, Design, Develop, Disseminate). The research data obtained is analyzed quantitatively to determine the validity, discriminatory power, reliability, and level of difficulty of the cognitive ability test instrument. Results of research based on the analysis of the validity test showed that the test instrument was declared valid by material experts and evaluation experts with an average value of 92.65. Based on the analysis of the validity of the item validity test, there are two invalid questions, namely questions number 2 and 10. Based on the results of analyzing differentiating power, the results of question number 20 are obtained, 64 for essay questions. Based on the analysis of the level of difficulty, the results showed that the test instrument was at 5% percent of the questions at the difficulty level, 20% at the sufficient level, 70% at the medium level, and 5% at the easy level. Overall, the test instrument is valid, reliable, has good discriminating power, and has varying levels of difficulty.
Co-Authors Ani Rusilowati Budi Astuti Fianti Fianti, Fianti Ian Yulianti, Ian