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Indicator of coffee resistance to leaf rust attack (Hemileia vastatrix) is needed to select superior coffee plants resistant to biotic stress. This study aims to find the relationship between the content of secondary metabolites and the intensity of leaf rust attack, so that it becomes a reference in the selection of future coffee plants. The experimental design used was a completely randomized design (CRD) with several coffee clones as a treatment. This test tested 5 Arabica coffee clones consisting of Komasti, Maragogik, Usda, Andong sari, and HDT clones. Each consists of 3 replications, and each replication consists of 2 sample plants. Observations were made by observing the intensity of the attack, and plant metabolites such as phenolic content, flavonoids and antioxidant activity were observed when the leaves had been attacked by Hemileia vastatrix. Correlation of leaf rust attack levels with phenolic content, flavonoids and antioxidant activity showed a relationship between each observation variable. Flavonoid content in certain conditions can be used as an indicator to get Arabica coffee plants that are resistant to the attack of leaf rust.

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Rubber is one of the important plantation crops for Indonesia. Rubber production that continues to increase is inseparable from the rubber waste produced, especially rubber wastewater. Rubber liquid waste can be managed into liquid fertilizer because there are carbon and nitrogen contents that can be used by microbes as growth substrate. Exploitation of rubber liquid waste is also expected to be able to solve existing problems in the cultivation of shallots, especially in the formation of tubers and minimize the use of chemical fertilizers. This study aims to determine the effect of liquid fertilizer concentration and interval of spraying liquid fertilizer from rubber waste on the growth and yield of shallots. The liquid fertilizer concentration used is 0 ml/l, 5 ml/l, 10 ml/l and 15 ml/l. The liquid fertilizer spraying interval used is 1 week, 2 weeks and 3 weeks. Data obtained next analyzed and tested using DMRT α 5%. The result showed te best treatment combination for concentration of 15 ml/l and a spraying interval of 1 week. Keywords: rubber waste, concentration, spraying interval, shallots ABSTRAK Karet merupakan salah satu tanaman perkebunan yang penting bagi Indonesia. Produksi karet yang terus meningkat tidak lepas dari limbah karet yang dihasilkan khususnya limbah cair karet. Limbah cair karet dapat dikelola menjadi pupuk cair dikarenakan terdapat kandungan karbon dan nitrogen yang dapat digunakan oleh mikroba sebagai subtrat pertumbuhan. Pemanfaatan limbah cair karet diharapkan juga dapat menyelesaikan permasalahan yang ada dalam budidaya tanaman bawang merah khususnya dala pembentukan umbi dan meminimalisir penggunaan pupuk kimia. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi pupuk cair dan interval penyemprotan pupuk cair dari limbah karet terhadap pertumbuhan dan hasil bawang merah. Konsentrasi pupuk cair yang digunakan antara lain 0 ml/l, 5 ml/l, 10 ml/l dan 15 ml/l. Interval penyemprotan pupuk cair yang digunakan antara lain 1 minggu, 2 minggu dan 3 minggu. Data yang diperoleh selanjutnya dianalisis dan diuji menggunakan DMRT α 5%. Hasil penelitian menunjukkan kombinasi perlakuan terbaik untuk konsentrasi dan interval penyemprotan pupuk cair adalah konsentrasi 15 ml/l dan interval penyemprotan 1 minggu. Kata Kunci: limbah karet, konsentrasi, interval penyemprotan, bawang merah

Di Sungai Barito Kalimantan Selatan terdapat sembilan suaka perikanan yang tersebar di beberapa wilayah yaitu Alalak Padang, Rawa Muning, DanauBangkau, Awang Landas, Banyu Hirang, Danau Panggang, Danau Talan, Sungai Sambujur, dan Babirik (Rupawan et al., 2004; Prasetyo & Hidayah (2005).Awang Landas berada di Kecamatan Labuan Amas, Kabupaten Hulu Sungai Tengah, tepatnya di Desa Mantaas Kalimantan Selatan, atau disebut jugasuaka perikanan Mantaas dengan luas 5 ha, suaka perikanan ini berada di suatu kawasan danau seluas 5.700 ha (Asyari, 2006).