The use of 32P Method to Evaluate the Growth of Lowland Rice Cultivated in a System of Rice Intensification (SRI)

A pot experiment has been conducted to evaluate the growth of the Dyah Suci, a lowland rice variety, in an SRI (System of Rice Intensification) planting system. The phosphorus-32 (32P) isotope technique was used to evaluate the growth of plants in relation with their phosphorus uptake. The uptake was assumed to vary in the same direction as the growth of the plant. The 32P uptake is assumed to vary in the opposite direction to the plant’s total phosphorus uptake. Here the 32P uptake is expressed in count per minutes (cpm) which is then transformed to disintegration per minute (dpm). The results show that, in terms of promoting the plant’s uptake of phosphorus, the SRI planting system is superior to the conventional planting system, and it is manifested in the higher dry weight of straw and grain. From this experiment it is concluded that the 32P method can be used satisfactorily as a tool for explaining therelation between P-uptake and plant growth.Received: 04 Juny 2013; Revised: 22 August 2013; Accepted: 30 August 201

Potensi Pseudomonas sp. untuk Mengendalikan Penyakit Hawar Daun Bakteri (Xanthomonas oryzae pv. Oryzae) Secara In Vitro

This research was aimed to determine the potential of Pseudomonas sp. in controlling bacterial leaf blight disease (Xanthomonas oryzae pv. oryzae) in vitro. This research was conducted at the Laboratory of Agroecology, Faculty of Agriculture, University of Sultan Ageng Tirtayasa on June to September  2014. This research implemented experimental one factor that arranged in Completely Randomized Design with five replications. The treatment consisted of 6 isolates of Pseudomonas sp. (Ps 6, Ps 29, Ps 39, Ps 40, Ps 45, dan Ps 46)  which was screened from the rhizosphere of roots of paddy plants. The inhibition of Pseudomonas sp. bacteria isolates was tested and showed that the results were not significantly different neither it was between each isolate nor against control (without treatment bacteria). Ps 39 isolate tend to had higher clear zone compare to other isolates.Tujuan penelitian ini untuk mengetahui potensi Pseudomonas sp. asal rhizosper padi sebagai agen hayati untuk mengendalikan penyakit hawar daun bakteri (Xanthomonas oryzae pv. oryzae) secara in vitro. Penelitian dilaksanakan di Laboratorium Agroekoteknologi, Fakultas Pertanian, Universitas Sultan Ageng Tirtayasa pada bulan Juni-September 2014. Penelitian  menggunakan rancangan acak lengkap non faktorial dengan lima ulangan. Perlakuan terdiri dari 6 isolat Pseudomonas sp. (Ps 6, Ps 29, Ps 39, Ps 40, Ps 45, dan Ps 46) yang memiliki kemampuan antagonis dan 1 kontrol air (tanpa bakteri) sebagai pembanding, sehingga terdapat 35 satuan percobaan. Isolat-isolat bakteri Pseudomonas sp. yang diuji daya hambatnya secara analisis tidak memiliki pengaruh, baik antar isolat maupun terhadap kontrol (tanpa bakteri perlakuan). Namun, secara keseluruhan mempengaruhi yaitu dengan terbentuknya zona bening menunjukkan adanya tingkat pengendalian. Isolat-isolat bakteri Pseudomonas sp. memiliki kemampuan yang relatif sama dalam mengendalikan bakteri Xanthomonas oryzae pv. oryzae. Meski demikian, isolat Ps 39 dan memiliki zona bening yang cenderung lebih tinggi

KARAKTERISASI BATANG DAN DAUN TANAMAN AREN DI KABUPATEN PANDEGLANG, SERANG, DAN LEBAK

ABSTRACTSugar Palm (Arenga pinnata Merr,) has a high economic value and has the potential to be exported and can be processed into a variety of food and non-food products. Sugar palm is a multipurpose tree because all parts of the tree can be used, such as stems, palm sap, leaves. Characterization of local palm trees had been carried out in Pandegelang, Serang, and Lebak Regencies (Banten Province) which were used as making nursery material to make better sugar palm in the future (superior varieties). This study used a survey method based on guidelines for plantation germplasm management from the Indonesian Plantation Research and Development Center. The results showed the diversity of stems and leaves of palm trees in the three districts. The diversity of stem phenotypes on sugar palm was seen in the height and circumference of the stem. Diverse appearance of palm leaves seen in the length and circumference of the ptiole, the length of the rachis, the length and width of the leaflets. The study conclude that the accessions used in this study showed variations in the appearance of stems and leaves from the accessions of palm trees observed

Aplikasi Pupuk Hayati Diperkaya Biosurfaktan Dietanolamida Olein Sawit dengan Interval Waktu yang Berbeda pada Bibit Kakao (Theobroma cacao L.)

The purpose of this research was to analyze the effects of biofertilizer enriched dietanolamide biosurfactan by palm oil at different time intervals on the growth of cacao seeds (Theobroma cacao L.). This research was conducted on the land of the Integrated Agricultural System area, Serang City, Banten Province. From December 2020 to March 2021. This study used a factorial Randomized Block Design. The first factor is the interval of application time, which as three levels : once every seven days, once every fourteen days, and once every twenty-one days. The second factor is the dose of biofertilizers plus DEA biosurfactant with palm olein at four levels : 10 ml / seed + 5% biosurfactant, 10 ml / seed + 10% biosurfactant, 20 ml / seed + 5% biosurfactant, and 20 ml / seed + 10% biosurfactant, Each treatment was repeated three times in order to obtain thirty-six experimental units. The parameters measured were plant height, number of leaves, stem diameter, plant dry weight, and root canopy ratio. The results showed that the treatment time interval of once every fourteen days had an effect on the number of leaves at 4 WAP (Week After Plant). While the treatment of the dosage of biofertilizers plus 20 ml of palm olein DEA biosurfactant / seed affected the parameters of the number of leaves at 4 and 8 WAP, there was an interaction on plant height at 2 and 4 WAP, number of leaves at 4 and 8 WAP, stem diameter at 12 WAP, and dry weight.

Pengaruh Jenis Plastik dan Metode Pengemasan Terhadap Kualitas Selada Selama Penyimpanan

Selada (Lactuca sativa L.) memiliki kandungan air yamg tinggi, tetapi kandungan karbohidrat dan proteinnya rendah, selain itu Selada juga mengandung sumber mineral, vitamin A, vitamin C, dan serat. Selama penyimpanan selada sering terjadi perubahan secara fisik yang menunjukan penurunan kualitas dari sayuran segar. Beberapa kerusakan yang terjadi antara lain seperti kehilangan warna dan kehilangan air. Penelitian ini bertujuan untuk melihat pengaruh penggunaan jenis plastik dan metode pengemasan serta interaksinya terhadap kualitas selada selama penyimpanan. Rancangan lingkungan yang digunakan pada percobaan ini adalah Rancangan Acak Lengkap (RAL), pola faktorial yang terdiri dari dua faktor yaitu Jenis Kemasan sebagai faktor pertama yang terdiri dari tiga taraf yaitu Plastik LDPE, Plastik Nylon, Plastik PET dan Metode Pengemasan sebagai faktor kedua yang terdiri dari dua taraf yaitu Tidak divakum dan Divakum. Hasil penelitian menunjukkan jenis plastik LDPE memberikan pengaruh nyata pada parameter susut bobot, kekerasan, total padatan terlarut, dan pH. Metode pengemasan berpengaruh nyata pada semua parameter pengamatan kecuali susut bobot pada hari kedua, dan vitamin C dan total    mikroba. Interaksi antara jenis kemasan dan metode pengemasan terjadi pada parameter susut bobot pada hari ke 6. Jenis plastik LDPE dan metode pengemasan tanpa divakum menunjukkan hasil cenderung lebih baik dalam mempertahankan kualitas selada selama penyimpanan

PENERAPAN METODE PEMBELAJARAN QUANTUM TEACHING UNTUK MENINGKATKAN PRESTASI BELAJAR KIMIA SISWA PADA POKOK BAHASAN HIDROKARBON DI KELAS X MADRASAH ALIYAH DAREL HIKMAH PEKANBARU

Penelitian ini bertujuan untuk meningkatkan prestasi belajar siswa dengan menggunakan metode Quantum Teaching pada pokok bahasan hidrokarbon. Penelitian ini adalah penelitian eksperimen dengan rencana penelitian pretes dan postes, dengan jumlah sampel 2 kelas yaitu kelas XA1 (eksperimen) dan kelas XA2 (kontrol). Untuk melihat peningkatan prestasi belajar siswa setelah diadakan perlakuan, dilihat dari data selisih nilai pretes dan postes antara kelas eksperimen dan kelas kontrol. Teknik pengumpulan data pada penelitian ini adalah dengan melakukan uji homogenitas sebagai data awal pada materi sebelumnya, pretes dan postes sebagai data akhir, dan dokumentasi. Data awal dan data akhir dianalisis dengan menggunakan t-test.Hasilpengolahan data akhir diperoleh nilai t hitung= 2,863 dan t tabel = 1,67 dan menunjukkan t hitung > t tabel, yang berarti menunjukkan terjadinya peningkatan prestasi belajar, dengan peningkatan sebesar 15,12 %. Dari hasil pengolahan data dapat disimpulkan bahwa penerapan metode pembelajaran Quantum Teaching dapat meningkatkan prestasi belajar siswa. Kata kunci : Quantum Teaching, Prestasi Belaja

Potensi Tumbuhan Obat dalam Upaya Pemanfaatan Lahan Pekarangan oleh Masyarakat Desa Cimenteng Kawasan Taman Nasional Ujung Kulon

The objective of research was to identify potential plants in order to be utilized as medicinal plant in the yard by community at Cimenteng village in Ujung Kulon National Park Area. Survey and interview method has been carried out with quantitative and qualitative approach. Data was collected by using explorative survey with interview and direct observation in fieldl; and analyzed descriptively. The result indicated that 48 plants have been identified and shown medicinal property; among them 20 plants cultivated in yard and 28 plants grown wildly around the yard. If the plants managed well, then Cimenteng village has an opportunity to be developed as agrotourism village. More than 30 medicinal plants area can be developed as tourism object which is economically will give a benefit for the community