Showing papers by "Joko Ridho Witono published in 2016"

DESAIN VEGETASI BERNILAI KONSERVASI DAN EKONOMI PADA KAWASAN PENYANGGA SISTEM TATA AIR DAS BOLANGO (Designing of Vegetation which Conservation and Economic Values in the Buffer Area of Water System at the Bolango Watershed)

Abstract: ABSTRAK Perencanaan pembangunan arboretum di DAS Bolango dengan konsep konservasi dan ekonomi perlu dilakukan karena DAS ini memiliki peranan yang penting dalam kehidupan masyarakat sekitar. Tujuan penelitian ini adalah memberikan rekomendasi tentang komposisi dan struktur vegetasi penyusun hutan pada kawasan arboretum sebagai pemelihara mata air Sungai Bolango. Penelitian dimulai dengan mengidentifikasi sumber mata air, tanah, dan kondisi vegetasi eksisting. Metode wawancara kepada masyarakat setempat dilakukan untuk mendukung data etnobotani. Kajian lahan dilakukan antara lain tata guna, kelas kemampuan, konsep pengelolaan, kesesuaian lahan, dan penentuan vegetasinya. Hasil identifikasi sumber mata air menunjukkan bahwa terdapat 3 lokasi yang potensial dibangun arboretum, yaitu Desa Meranti Kecamatan Tapa Kabupaten Bone Bolango, Desa Dulamayo Selatan Kecamatan Telaga Kabupaten Gorontalo, dan Desa Mongiilo Kecamatan Bolango Ulu Kabupaten Bone Bolango. Berdasarkan data kualitas tanah, ketiga lokasi memiliki media perakaran yang cukup baik untuk tanaman budi daya. Secara umum, semua jenis tanaman budi daya sesuai untuk ditanam di ketiga lokasi arboretum. Perlu dilakukan pembuatan teras dan penerapan pola tanam konservasi yang mengaplikasikan tanaman penutup tanah ( cover crop ), tanaman budi daya, dan pohon penyusun hutan. Selain itu, perlu pemberian pupuk organik berupa kompos dan pupuk kandang. ABSTRACT Arboretum development planning in Bolango Watershed using concept of conservation and economy is conducted because the watershed has an important role in people's lives around. This study aims to provide recommendations about composition and structure of forest vegetation in the arboretum area for conserving of Bolango River’s water springs. The study began by identifying the source of the springs, soil, and the existing vegetation. Interview to local communities was conducted to support the data of ethnobotany. Land observation was studied among other land use, class capabilities, management concepts, land suitability, and vegetation selection. The results of the identification of water sources indicated that there were three potential sites built arboretum, i.e Meranti Village Tapa District of Bone Bolango Regency, Dulamayo Selatan Village, Telaga District of Gorontalo Regency, and Mongiilo Village Bolango Ulu District of Bone Bolango Regency. Based on the data of the soil quality, the third location had a pretty good rooting medium for plant cultivation. Generally, all of plant cultivation were suitable to planted in the third location of arboretum. There were important to built terraces and applicate a model of conservation plants using cover crops, cultivation plants, and trees. In addition, it should be applicated organic fertilizer such as compost and manure.

The Estimation of Combining Ability and Heterosis Effect for Yield and Yield Components in Tomato (Lycopersicon esculentum Mill.) at Lowland

Abstract: A study was conducted in a 6 × 6 full diallel cross set of tomato including reciprocals to estimate the general combining ability, speciSc combining ability and heterosis for yield per plant (g) and yield components, namely number of fruits per plant, individual fruit weight (g) fruit length (cm), fruit diameter (cm), locule number, and fruit thickness (cm). The experiment was conducted from March to August 2013 at Bogor Agricultural University Experiment Field, BogorIndonesia. Randomized Complete Block Design was used with three replications. Data from Fl generation and parents were analyzed using the GrifSng Method. SigniScant differences among genotypes were obtained for all the traits. The variances for general combining ability (GCA) and speciSc combining ability (SCA) were highly signiScant indicating the presence of additive as well as non-additive gene effects except the fruit thickness. The tomato genotype IPB 78 is parental with the best general combining ability for yield per plant, individual fruit weight, fruit length, and fruit thickness. The tomato genotype IPB T73 x IPB T3 proved to be the best general combiner for yield and number of fruits per plant. The tomato genotype IPB T3 x IPB T1 proved to exhibit best heterosis for yield per plant and fruit thickness