Fe toxicity on recent ricefield has been common problem in ricefield management to increase rice productivity. Adding organic matter like humic acid from any source (such as hay residue compost) and water management (intermitten flooding and continue flooding) can reduce Fe toxicity and it will be able to increase rice yield in one plant season.  But how about in second plant season, this research will found effect of adding humic acid from hay compost residue and water management. The objective of this research was to study the interaction of hay compost humic acid residue effect and water management  on Fe abundant and nutrient uptake and rice yield in recent ricefield.  This research has done by split-split plot design 2 x 4. The main plot which was treatment of water management were permanent flooding and intermitten (P1 and P2). And the  split plot which was  humic acid treatments were Ao = 0 ppm (0 Kg humic acid /Acre), A1= 200 ppm (400 Kg humic acid/A), A2= 400 ppm (800 Kg humic acid/A), A3 = 600 ppm (1200 Kg humic acid /A). Data analysed by statistical methode, if the treatments were significant to be continued by Duncan 05 % analysis.  The result has obtained of this research which was Eh value of soil in flooding and intermitten was decrease in every week because treatment of humic acid in first season. The content of Fe2+ in soil was increase in every week until the 8th week. Value of soil pH until 8th week flooding was increase, and caused P available and P potencial were increase too. Plant growth and yield of rice in second season not better than first season, and for intermitten flooding caused better plant growth and yield of rice.    Keyword :  Fe Toxicity, Humic Acid, water management, Recent Ricefield

Dalam penelitian ini terkandung unsur pembuktian dan eksperimen yang lengkap mengenai pengambilan keputusan pemakaian panel surya tipe monocrystalline dan polycrystalline khususnya di kota Pangkalpinang, Provinsi Kepulauan Bangka Belitung. Pengambilan data antara kedua panel surya yang dibandingkan dilakukan selama 30 hari (23 September 2020 – 22 Oktober 2020) melalui berbagai macam cuaca. Tujuan dari penelitian ini adalah melihat dan menganalisa pemilihan tipe panel surya yang cocok (monocrystalline atau polycrystalline, masing – masing 250 Wp dengan merek yang sama) untuk kota Pangkalpinang agar dapat meningkatkan suplai energi yang lebih tepat dan efisien. Penggunaan arduino untuk mengambil data pada panel surya dimaksudkan agar data yang didapatkan nantinya bisa lebih akurat dan terpetakan dengan baik jika dibandingan dengan apabila data diambil secara manual dengan cara dicatat. Hasil pengujian menyatakan bahwa panel surya jenis monocrystalline lebih baik dibandingkan polycrystalline dengan perbedaan energi yang dihasilkan sebesar 4.9%.

A research about relationship between soil properties and crop yield was conducted in Pandai Sikek, Tanah Datar Region, center for cabbage and carrot production, West Sumatra in 2004 and 2005. Soil samples were collected from rainfed paddy soils by purposive random sampling. Soil samples were analyzed in Soil Laboratory, Agriculture Faculty and Agriculture Polytechnique Laboratory, Andalas University. Several soil physical properties analysed were soil bulk density and total soil pores by using gravimetric method, permeability with de Boodt method, soil water content at several pF values using pressure plate apparatus, and soil strength by using penetrometer. Soil chemical parameters analysed were soil pH using pH-meter, organic-C using Walkley and Black, available P using Bray II, and cation exchange capacity using NH4-leaching at pH 7.0, and N-total using Kjehdhal method. Crop productions were sampled from a 3x3 m 2 of soil sampling area. The result showed that soils planted by cabbage and carrot had good soil physical properties, such as having balanced pore size distribution. The chemical properties of the soils were good as well, except N, K-and Ca-exchangeable which were very low. The other soil properties were quite good. Soil physical properties gave different response on both crops. Carrots were more response aeration pore and soil organic matter content, then cabbage was more response on BV, TSP, and slow drainage pores. While soil chemical properties did not give significant response. Both crops responded on Ca, but cabbage was more response on N-total, and carrot on CEC and saturated cation

Abstr actThe research about potency of non-ionic organic compounds to decrease the dissolved iron (Fe) and to increase productivity of recently used ricefield had been conducted from August 2004 till January 2005. The objective was to study the effect of non-ionic organic compounds applied to control Fe and to increase rice production on recently used ricefield. The experiment used completely randomized design with four treatments and three replications. The treatments were consisted of four levels of non-ionic organic compounds (polysaccaride), those were 0, 75, 150, and 225 ppm. The result of this study showed that the effect of non ionic-organic compounds (polysacaride) at 225 ppm could reduce solubility of Fe 2+ from 302,67 to 126,67 ppm for 30 days flooded. The yield of the rice (dry weight of grain and percentage filled out of grain) increased as much as 2,95 g dan 35 % with effect of polysaccaride at 225 ppm.

Laboratorium merupakan tempat mahasiswa melakukan aktifitas praktikum dalam lebih memahami suatu mata kuliah. Di laboratorium Teknik Elektro UBB banyak sekali alat dan komponen elektronika yang digunakan sehingga dibutuhkan invetarisasi peralatan dan komponen tersebut agar mudah dalam penggunaannya. Kegiatan inventaris barang pada Laboratorium Teknik Elektro sebelumnya menggunakan sistem pencatatan manual sehingga dalam pelaksanaannya belum berjalan secara optimal dan masih manual sehingga banyak permasalahan yang terjadi. Untuk mengatasi hal tersebut diperlukan suatu aplikasi yang mampu mendata peralatan dan komponen yang ada di laboratorium, proses peminjaman, pengembalian dan kondisi barang yang ada secara otomatis. Aplikasi invetarisasi ini dibuat melalui beberapa tahap yaitu, identifikasi permasalahan, perancangan, pembuatan aplikasi dan barcobe alat dan tahap implementasi aplikasi. Aplikasi dibuat menggunakan menggunakan software pengolah data, sedangkan barcode dibuat dengan Barcode Studio. Hasil dari penelitian ini telah diterapkan pada Laboratorium teknik Elektro dan sangat membantu dalam proses peminjaman, pengembalian, pengontrolan kondisi barang yang ada dilaboratorium, dan pembuatan laporan dan dapat dilakukan secara digital serta penyimpanan data menjadi lebih aman dan elektronik