Pengelolaan tanaman penutup tanah merupakan salah satu merupakan salah satu teknik konservasi tanah dan air di perkebunan kelapa sawit. Penelitian ini bertujuan untuk mempelajari potensi beberapa gulma sebagai tanaman penutup tanah di perkebunan kelapa sawit menghasilkan. Penelitian dilaksanakan di perkebunan kelapa sawit rakyat umur 20 tahun di Desa Namorambe Kecamatan Namorambe, Kabupaten Deli Serdang, Sumatera Utara dari Maret sampai Juni 2017. Penelitian disusun menggunakan rancangan acak kelompok satu faktor. Empat spesies gulma (N. biserrata, A. gangetica, P. conjugatum, dan A. conyzoides) dijadikan sebagai perlakuan, setiap perlakuan diulang tiga kali. Hasil penelitian menunjukkan bahwa N. biserrata, A. gangetica, P. conjugatum, dan A. conyzoides berpotensi digunakan sebagai tanaman penutup tanah di area kelapa sawit menghasilkan. Keempat spesies tersebut mudah diperbanyak, cepat menutup lahan (8-12 minggu setelah tanam), memproduksi daun dan cabang cukup banyak, dan cukup mengandung unsur hara di dalam jaringan tanamannya. Kandungan N, P, K, dan C organik tertinggi berturut-turut terdapat pada N. biserrata (4,02% N), P. conjugatum (0,31% P), A. gangetica (2,41% K), dan A. conyzoides (37,23% C-organik).
Studi jarak tanam dan naungan terhadap pertumbuhan dan potensi Asystasia gangetica (L.) T. Anderson sebagai tanaman penutup tanahStudy of plant distance and shade on growth and potential of Asystasia gangetica (L.) T. Anderson as cover crop Abstract. Cover crop is one of nature-based agricultural practices that can increase the provision of various ecosystem services in agroecosystems. A. gangetica is a weed that is often found in oil palm plantations and has the potential as a cover crop. This study aimed to study the optimum planting distance of growth and potential of A. gangetica as a cover crop on open and shaded land. The study was conducted at the Experimental Field, Faculty of Agriculture, UISU, Medan, from January to April 2018. The study used a Split Plot Design with three replications. The first factor as main plot was shade that consisted of two levels, there were: without shade and 50% shaded. The second factor as subplot was planting distance which consisted of three levels, there were: 10 cm x 10 cm, 20 cm x 20 cm, and 40 cm x 40 cm. The results showed that A. gangetica has the potential as cover crop because it grew fast, cover land rapidly, adapt to the environment, and able to suppress weed with an optimum planting distance of 20 cm x 20 cm.
Physiological characteristics of rubber trees are closely related to the ability to form latex. Sucrose, inorganic phosphate, and thiol levels in latex are physiological characters. The purpose of this study was to determine the correlation between physiological characters and latex production of clone RRIM 921 and proper stimulant application without disturbing the health of rubber trees. This research was conducted at PT. Perkebunan Nusantara III (Persero), Sei Putih Farm, and Physiology Laboratory of Sungei Putih Research Institute in 2018. The clones tested in this study were 17 years old of clone RRIM 921. This study uses correlation statistical analysis and regression test. Correlation analysis show that Pi level has negative significant correlation with Thiol latex, where high level of Pi will be followed by low level of thiol and vice versa. Latex production of clone RRIM 921 in May, June and July were not affected by latex physiology. The right stimulant application after leaf fall for RRIM 921 is in May.
Spring maize is maize cobs that are harvested at a young stage as a vegetable ingredient. Therefore, the initiative and commercial cultivation of spring maize with an agribusiness pattern has bright prospects This study aims to determine the effect of compost sludge and NPK fertilizer on the growth and yield of spring maize. The research method used a factorial randomized design with three replications and two treatment factors, namely the dose of compost sludge and NPK fertilizer. The results showed that the application of sludge compost at a dose of 15 t/ha and NPK fertilizer at a dose of 450 kg/ha was able to increase the growth and yield of spring maize. While the interaction between the treatment of sludge compost and NPK fertilizer was only able to affect the height of spring maize with the best treatment interaction of 15 t/ha of sludge compost with 450 kg/ha of NPK fertilizer.
This study aims to analyze the conversion of rubber land to oil palm and its effect on production in North Sumatra. Today many rubber farmers are turning their land into oil palm plantations. So that the famous commodity from North Sumatra, namely, palm oil, is no longer rubber. Whereas previously the rubber plant (Hevea brasiliensis) as a plantation plant that was integrated with the culture of the people of North Sumatra Province had environmentally friendly properties. This study uses descriptive qualitative research methods. Data were collected by observation, interviews, literature study, and document analysis. The results show that smallholder rubber plantations have been the mainstay of the economy of North Sumatra Province since a century ago. Although there has been a change from Rubber Land to Palm Oil Land, currently North Sumatra accounts for 33% of the total national natural rubber production. North Sumatra is the second largest natural rubber producer after South Sumatra.
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