3 research outputs found
Pengaruh Variasi Lebar Bilah Bambu Terhadap Keruntuhan Geser Balok Bambu Laminasi Dengan Susunan Bilah Vertikal Sebagai Suplemen Bahan Ajar Konstruksi Bambu
No full textPenelitian ini bertujuan untuk (1) Mengetahui sifat-sifat fisika dan mekanika bambu petung, yaitu kadar air, kerapatan, kuat tarik sejajar serat, kuat tekan sejajar serat, kuat lentur, kuat geser dan modulus elastisitas terhadap kelas kuat kayu. (2) Mengetahui pengaruh variasi lebar bilah bambu (10 mm, 15 mm, 20 mm) dengan susunan vertikal terhadap modulus elastisitas (MOE), kuat lentur (MOR) dan tegangan geser (τ) bambu laminasi. (3) Mengetahui nilai optimal variasi lebar bilah bambu dengan susunan vertikal terhadap modulus elastisitas (MOE), kuat lentur (MOR) dan tegangan geser (τ) bambu laminasi. (4) Mengetahui nilai optimal variasi lebar bilah bambu dengan susunan vertikal modulus elastisitas (MOE), kuat lentur (MOR) dan tegangan geser (τ) bambu laminasi terhadap kelas kuat kayu. Penelitian ini menggunakan metode kuantitatif eksperimen dan teknik analisis data menggunakan analisis regresi sederhana. Variabel yang mempengaruhi dalam penelitian ini adalah (1) variabel bebas / independen : variasi lebar bilah bambu (10 mm, 15 mm, 20 mm) dengan susunan vertikal. (2) variabel terikat / dependen : modulus elastisitas, kuat lentur dan tegangan geser. Berdasarkan hasil penelitian disimpulkan bahwa, (1) sifat fisika dan mekanika bambu petung termasuk dalam kelas kuat kayu II. (2) penggunaan variasi lebar bilah bambu (10 mm, 15 mm, 20 mm) dengan susunan vertikal berpengaruh terhadap nilai modulus elastisitas (MOE), kuat lentur (MOR) dan tegangan geser (τ). (3) Nilai optimal modulus elastisitas (MOE) menggunakan variasi lebar bilah bambu 10 mm sebesar 6492,60 MPa. Nilai optimal kuat lentur (MOR) menggunakan variasi lebar bilah bambu 15 mm sebesar 69,44 Mpa. Nilai optimal tegangan geser (τ) menggunakan variasi lebar bilah bambu 15 mm sebesar 6,94 Mpa. (4) Nilai optimal variasi lebar bilah bambu dengan susunan vertikal modulus elastisitas (MOE), kuat lentur (MOR) dan tegangan geser (τ) bambu laminasi termasuk dalam kelas kuat kayu III
'Pot cultivation' as a form of soil and water conservation technique for adaptation to soil condition and climate change in karst area
No full textShallow soil is found in Gunungsewu karst area of Gunungkidul Indonesia, often referred as 'soilly rock'. Its the main problem are limited of growing medium and soil loss due to erosion. ‘Pot cultivation’ (PC) is term to describe technique of cultivating crop on small plot of soil between rock. Study aimed to determine 1) the practice of soil and water conservation (SWC) techniques of PC as a form of adaptation to soil condition, 2) the potency of PC for adaptation and mitigation of climate change in karst area. Research was conducted in Gunungsewu karst area, from January to August 2020. Study method was observation and interview. Results showed that practice of PC was carried out as form of adaptation to shallow soil in karst area. Soil is managed to fill the rocks, so sufficient as plant growth medium. Rock functions as a 'pot'. Rock 'pots' function like terraces in SWC. PC is effective way in increase of growing medium, preventing soil from erosion, preserving soil organic carbon, and as an action of adaptation and mitigation co-benefit. The results of this study are expected to be useful for development of karst area which have shallow soil
Cropping pattern as the key for sustainable agriculture in the dry land of the Gunungsewu Gunungkidul karst area
No full textDry land of karst area depends on rainfall for water supply, so cropping pattern as an important factor in agricultural sustainability. This research aimed to formulate cropping pattern as the key to sustainable agriculture in the dry land of karst area. Research was conducted in dry land of karst area, Gunungsewu, D.I. Yogyakarta, Indonesia, from January to July 2024. Observation, interview and literature study were conducted to formulate sustainable cropping pattern. Results showed that crop water requirement and rainfall determine cropping pattern. Effective rainfall in first growing season allows for cultivation of rice, corn, groundnut, soybean, and cassava. In second growing season, effective rainfall supports cultivation of corn, groundnut, soybean, and cassava. Without irrigation, third growing season is fallow. Resources in the form of water, sunlight, plant commodities, manure, chemical fertilizers, pesticides, litter, household waste, fuel and electricity are managed to support the success of cropping pattern. Successful cropping pattern are characterized by resource optimization, increased crop diversity and yield, improved soil fertility and nutrient, reduced soil degradation and crop failure, and greenhouse gas mitigation. As key to sustainable agriculture, cropping pattern are built on the basis of resource optimization, taking into account physical, economical, social and environmental aspects
