Effect of Shade and NPK Fertilizer on the Growth of Shorea assamica Dyer in the Nursery

Abstract

Shorea assamica Dyer is one of endangered species in the North Sulawesi. The species has high economic value, however information about technique of silviculture and its conservation are very limited. The research aims to determine the effect of shade and the use of NPK (15:15:15) fertilizer on growth rate of S.assamica in the nursery. The design was applied in this reserach according to randomized complete design with split plot design. The main plot was shade level and the sub plot was NPK fertilizer level. The treatments were covering four levels of NPK fertilizer (0; 0.25; 0.50 and 0.75 g/seedling) and three levels of shade (light, medium, and heavy). The results showed that the best combination of treatments for height and diameter growth, seedling dry weight, and seedling quality index of S. assamica on 6 months age was NPK fertilizer dosage of 0.5 g/seedling in moderate shade. Keywords: NPK fertilizer dosage, S. assamica, seedling, shade ABSTRAKShorea assamica Dyer adalah salah satu jenis tanaman yang sudah terancam punah keberadaannya di Sulawesi Utara. Meskipun tanaman ini memiliki nilai ekonomi tinggi, namun informasi teknik budidaya dan upaya pelestariannya masih sangat terbatas. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan dosis pupuk NPK (15:15:15) dan naungan terhadap pertumbuhan semai di persemaian. Rancangan S.assamica penelitian yang digunakan adalah rancangan acak lengkap (RAL) yang disusun dengan pola petak terbagi, dengan tingkat naungan sebagai petak utama dan dosis pupuk NPK sebagai anak petak. Perlakuan yang diterapkan adalah tiga taraf tingkat naungan (ringan, sedang, dan berat) dan empat taraf dosis pupuk (0; 0,25; 0,50 dan 0,75 gr/semai). Hasil penelitian menunjukkan bahwa kombinasi perlakuan terbaik yang memberikan pengaruh terhadap pertumbuhan tinggi dan diameter semai, berat kering semai, serta indeks kualitas semai (IKS) S.assamica pada umur 6 bulan adalah perlakuan dosis pupuk NPK 0,5 gr/semai pada naungan sedang. 85Hasil pengukuran tinggi dan diameter semai S. assamica selama 6 (enam) bulan ditampilkan pada Tabel Hasil analisis ragam terhadap sifat tinggi, diameter, berat kering dan indeks kualitas semai pada umur 6 bulan, disajikan pada Tabel 4.Tabel (Table) 3. Rata-rata pertumbuhan semai S.assamica selama 6 bulan (The height and diameter growth of S. assamica seedling during 6 months age) Pupuk (

Preference of Simpai (Presbytis melalophos melalophos) on Forage Plant Types in Bukit Daun Protevted Forest of Taba Penanjung District, Central Bengkulu Regency

“…On Meranti, Sumatran Simpai seemed to move frequently from one branch to other branches to choose the leaflets and flowers. [10] stated that the primate is usually at the 16-24 m in height and branches (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). Sumatran Simpai is usually at the side of the tree where there are more leaflets.…”

“…It is a folivorous primate that consumes leaflets (leaf monkeys), yet it also consumes other plant organs like fruit and flower. According to [12], Sumatran Simpai picks leaflest as main forage since it contains cellulose. Cellulose will be fermented by bacteria in the primate's digestive tract to be fatty acid that easily evaporates, just like Ruminantia digestive system.…”