Rice (Oryza sativa L.) productivity in Indonesia is leveling off. The study aims to determine the effect of the Jejer Manten double rows modified planting system on the growth, productivity, and economic feasibility of the rice farming system. The study was conducted in Lampung Province, Indonesia from 2016 to 2018. The study was arranged using a split-plot design with 3 replications. The treatment consisted of two factors namely: planting system (S1 = Jajar Tegel, S2 = Jajar Legowo double rows 2:1, and S3 = Jejer Manten double rows modification) and rice varieties (V1 = Ciherang; V2 = Inpari 10).The results of the study showed that the Jejer Manten planting system produced higher growth and productivity than Jajar Tegel and Jajar Legowo planting system. During the three years of research, the application of the Jejer Manten planting system increased productivity by 6.04-32.27% compared to Jajar Tegel and 13.78-28.92% compared to the Jajar Legowo planting system. Economically, based on the analysis of marginal benefit-cost ratio (MBCR), the application of the Jejer Manten planting system was more feasible than the Jajar Tegel planting system (MBCR = 6.32) and Jajar Legowo planting system (MBCR = 8.18). Based on these results, it is recommended to apply the Jejer Manten planting system as a new technology to increase rice production and support of food self-sufficiency program of Indonesia.

Pepaya sangat potensial dibudidayakan di lahan rawa pasang surut, tetapi ketersediaan hara dalam tanahnya tergolong rendah. Nitrogen dan kalium merupakan hara yang relatif banyak dibutuhkan pepaya, sehingga budidaya pepaya di lahan rawa pasang surut perlu penambahan hara tersebut melalui pemupukan. Penelitian dilakukan di lahan rawa pasang surut eks proyek lahan gambut (PLG) sejuta hektar di Kecamatan Mantangai, Kabupaten Kapuas, Provinsi Kalimantan Tengah dari bulan Juni 2007 sampai April 2008. Tujuan penelitian ialah untuk mengetahui pengaruh pemberian hara N dan K terhadap pertumbuhan dan produksi pepaya. Benih pepaya yang digunakan ialah varietas Merah Delima. Penelitian disusun dengan rancangan acak kelompok  faktorial dengan tiga ulangan. Faktor I ialah takaran pupuk nitrogen yaitu 0, 125, 250, 375 g/tanaman dan faktor II ialah takaran pupuk kalium (K20) yaitu 0, 150, 300, 450 g/tanaman. Tiap unit perlakuan terdiri atas 10 tanaman. Parameter yang diamati meliputi sifat kimia tanah, pertumbuhan vegetatif, dan produksi tanaman. Hasil penelitian menunjukan bahwa  ketersediaan N, P, dan Fe di lokasi penelitian tergolong sangat tinggi, K rendah, sedangkan Ca dan Mg sangat rendah. Pemupukan N hingga taraf 375 g/tanaman tidak berpengaruh nyata terhadap peningkatan pertumbuhan vegetatif tanaman pepaya. Namun pada fase produktif (10 bulan setelah tanam), panjang buah secara nyata meningkat dengan pemberian N 250 g/tanaman. Pemberian K2O pada taraf 300g/tanaman secara nyata meningkatkan pertumbuhan vegetatif dan produksi tanaman (jumlah, bobot, panjang, dan PTT), sedangkan pemberian K2O yang melebihi 300 g/tanaman mengakibatkan penurunan pertumbuhan, produksi, dan kualitas buah. Hasil penelitian ini dapat digunakan sebagai landasan penelitian dan penyusunan rekomendasi pemupukan pepaya di lahan rawa pasang surut. <br /><br /><br /><br />Papaya has opportunity to be cultivated in tidal swamp land but the availability of its nutrient in the soil is low.  Nitrogen and potassium are the major nutrients needed by papaya, so that the nutrient should be added through fertilization. The research was conducted in tidal swamp land in Mantangai, Kapuas, Central Kalimantan Province, from June 2007 to April 2008. The objective of this research was to investigate the effect of nutrient N and K on growth and production of papaya in tidal swamp land. Merah Delima variety was used as a seed in this research. The factorial experiment was arranged in a randomized block design with three replications.The first factor was dosage of nitrogen of 0, 125, 250, and 375 g/plant and the second factor was amount of potassium (K2O) from 0, 150, 300, and 450 g/plant. Each unit of treatment consisted of 10 plants. The parameters observed include the chemical properties of soil, vegetative growth, and crop production. The results showed that the availability of  N, P, and Fe at the research location was classified as very high, whereas K was low, Ca and Mg were very low. Nitrogen fertilization up to level 375 g/plant did not significantly increase the vegetative growth of papaya plants because of its high availability of the nutrition on the soil. However, in the productive phase (10 months after planting), fruit length was significantly increased with application of N in dose 250 g/plant. Application of K2O fertilizer on 300/plant increased significantly vegetative growth and yield (number of fruit, fruit weight, fruit length, and TSS), whereas application of more than 300 g/plant decreased their growth, yield, and fruit quality. The results can be used as the basis to arrange and formulate fertilizer recommendation on papaya  which is mainly grown on tidal swamp land.<br /><br />

ABSTRAK. Cemaran getah kuning merupakan masalah utama yang menyebabkan rendahnya kualitas buah manggis untuk ekspor. Ketersediaan hara di dalam tanah diduga berpengaruh terhadap cemaran getah kuning. (Tambahkan informasi pada level konsentrasi hara Ca dan Mn yang bagaimana yang berpengaruh terhadap frekuensi/insidensi getah kuning pada manggis).  Penelitian hubungan antara ketersediaan hara tanah dengan cemaran getah kuning pada buah manggis dilakukan di Desa Karacak, Barengkok, Garogek, dan Pusaka Mulia (Jawa Barat),  Koto Lua, Baringin, Pakandangan, Padang Laweh, Lalan (Sumatera Barat), dan Sukarame (Lampung), dari bulan  Desember 2009 sampai Juli 2011 (Perlu ditambahkan informasi yang jelas perbedaan lokasi yang dipilih apakah merepresentasikan adanya perbedaan yang mencolok kasus cemaran getah kuning manggis, sehingga pembaca bisa membaca alasan penentuan lokasi tersebut, mengingat cemaran getah kuning menjadi factor penting penelitian ini). Lokasi penelitian di tingkat desa ditentukan dari hasil wawancara menggunakan teknik purposive sampling dengan pedagang pengumpul di tingkat kecamatan dan desa. Pada setiap lokasi dari 10 sentra produksi yang terpilih, ditentukan 10 tanaman yang representatif  untuk diamati, setiap tanaman diambil 100 buah sampel. Buah manggis yang diamati untuk seluruh lokasi mencapai 10.000 buah (1.000 buah untuk setiap lokasi). Sampel tanah diambil dari zona perakaran pada masing-masing pohon serta dianalisis sifat kimia dan ketersediaan hara tanahnya. Hasil penelitian menunjukkan bahwa cemaran getah kuning pada buah manggis secara langsung dikendalikan oleh ketersediaan Ca dan Mn dalam tanah. Ketersediaan K, P, Mg, Cu, Zn, dan B dalam tanah secara tidak langsung berpengaruh terhadap cemaran getah kuning (Mekanismenya bagaimana? Perlu dijelaskan). Kalsium berperan mengeliminasi, sedangkan Mn menginduksi cemaran getah kuning pada aril (daging buah) maupun kulit buah manggis. Hasil penelitian ini dapat digunakan sebagai landasan untuk mengendalikan cemaran getah kuning pada buah manggis.<br /><br />ABSTRACT. Martias, Poerwanto, R,  Anwar, S, and Hidayati, R 2012. Relationship between Nutrient Availability of Soil with Yellow Sap Contamination on Mangosteen Fruits. Yellow sap contamination on mangosteen fruits is a major problem that causes poor quality on mangosteen fruits for export. Soil nutrients availability would  be expected influence directly and indirectly in eliminating or inducing yellow sap contamination. Research relationship between nutrients availability with yellow sap contamination on mangosteen fruits was  done in some mangosteen production center areas in the Village Karacak, Barengkok, Garogek, and Pusaka Mulia (West Java), Koto Lua, Baringin, Pakandangan, Padang Laweh, and Lalan (West Sumatera), and Sukarame (Lampung), from December 2009 to July 2011. Research sites at the village level were determined by interviewing traders at district and village levels using purposive sampling technique. At each location of 10 from center production that was selected, determined 10 plants representative to observe, each plant taken 100 fruits sample. Mangosteen fruits were observed for all sites reach 10 thousand pieces (1,000 pieces for each location). Soil samples were taken at the root zone of each tree and analyzed the chemical properties and soil nutrient availability. The results showed that the yellow sap contamination of mangosteen fruits was directly controlled by the availability of Ca and Mn  in the soil. The availability of K, P, Mg, Cu, Zn, and B in the soil indirectly affected yellow sap contamination. Calcium played to eliminate and Mn contributed to induces yellow sap contamination, either aryl and the skin of mangosteen fruits. The results of  this study can be used as the basis for the study contaminat control yellow sap of the  mangosteen fruits.<br />

The current development of technology is quite rapidly not disengaged in a large data processor covering of all areas such as information technology, computer science, medicine, finance and other. This brings a large computing effect in identifying the processing of data. In data analysis for very large data, data processing is very much needed, in this study the authors propose data mining method as a solution to a large data processing problem, data mining is divided into several techniques including classification method techniques that aims to classify large amounts of data to be relevant data information. In this study the authors compared 5 algorithms in the classification method to get better performance in classification problems. Researchers analyze and test 5 Algorithm classifications with 4 different datasets as a tool in the problem of large data classification. The results of this research show the method SVM is much better to be used 4 comparison methods in calculating the value of AUC by using 4 datasets of UCI Repository. The LSVT Dataset shows the highest AUC value with 0973, Ionsphere 0887, Sonar 0897, Heartstatlog 0868.

Manganese (Mn) is one of the essential micronutrients that plays a crucial role in plants' growth and development and is also considered a limiting factor for crop production. This study aimed to determine the critical level of Mn in soil and leaves for improving the quality of mangosteen fruit. The research was conducted in 2015 in several mangosteen production centers, including West Sumatra (Simalanggang and Banja Laweh), West Java (Karacak and Barengkok), Bali (Belimbing and Selamadeg). A well-maintained of fifteen to twenty years old mangosteen plants were used with uniform soil fertility. Purposive random sampling is conducted in each location to select ten plants from each site. Soil samples are taken from under the plant canopy around 0-30 cm in depth at the four cardinal directions. The terminal leaves that collected from the middle part of the plant canopy are used as the leaf samples. Physiological ripe fruits are taken after ripening with index 3-4. The parameters observed consist of (1) soil pH of H2O, Ca, Mg, Mn-available, (2) levels of Mn, Ca, Mg, and K in the leaves, (3) fruit quality (fruit weight, fruit diameter, fruit skin thickness, aryl weight, seed weight). The results showed the Mn content in the soil ranged from 18.89 to 33.63 ppm. Available Mn is negatively affected by pH, Ca, and Mg exchangeability. Soil Mn is linearly related to leaf Mn with R2 0.76. The critical values of Mn in leaf and soil for mangosteen plants in Indonesia were 425 ppm and 22 to 24 ppm, respectively.