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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management Halaman Olahraga Nusantara : Jurnal Ilmu Keolahragaan
Widiyatno
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Agriculture, Biological Sciences & Forestry Social Sciences

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Growth of Betung Bamboo (Dendrocalamus asper) and Food Crop Production Under Agroforestry Bamboo Systems Hani, Aditya; Suryanto, Priyono; Murniati, Murniati; Widiyatno
Jurnal Manajemen Hutan Tropika Vol. 30 No. 1 (2024)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7226/jtfm.30.1.155

Abstract

One of the main species in community forests is betung bamboo (Dendrocalamus asper). Optimizing land use under bamboo can be achieved by cultivating food crops. This research aimed to determine the growth of betung bamboo and the production of food crops. The experimental design used a split plot design with four cultivation patterns as the main plots: agroforestry bamboo pattern i.e. agroforestry bamboo + rice (P1), agroforestry bamboo + rice + cassava (P2), agroforestry bamboo + rice + taro (P3), and mixed food crops (rice + cassava + taro) (P4), while the subplots were rice varieties: rindang 2 (V1), protani (V2), and unsoed (V3). The observed parameters were bamboo growth, soil fertility, and food crop production. The results showed that seven-year-old betung bamboo had an average of 6.01 mature stems per clump, an average plant height of 7.23 m, and a stem diameter of 7.12 cm. The numbers of young stems and shoots per clump was 1.45 and 3.71. The highest betung bamboo growth was in the agroforestry pattern (length: 8,49 m, diameter: 7.17 cm, thickness: 1.95, total weight: 21.31 kg). The highest rice yield was observed in the P2V1 treatment (4.17 kg). The highest cassava tuber yield per plant was observed in P4 (2.12 kg). The taro tuber yield was relatively higher in the agroforestry pattern with a distance of >1 m from the bamboo clump (0.52 kg plant-1). The land equivalent ratio (LER) and area time equivalent ratio (ATER) of bamboo and food crop agroforestry have a value above 1, so it is more efficient in land.
Javelin Throw Training Model Bassed Medicine Ball Widiyatno; Fikri, Aprizal; Satria, M. Haris
Halaman Olahraga Nusantara : Jurnal Ilmu Keolahragaan Vol. 8 No. 2 (2025): Halaman Olahraga Nusantara (Jurnal Ilmu Keolahragaan)
Publisher : Universitas PGRI Palembang

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Abstract

This study aims to develop and evaluate the effectiveness of a medicine ball-based javelin throwing training model on improving upper body strength, motion coordination, and throwing distance in athletic athletes in Palembang City. The research method used is an experimental method with a quantitative approach. The sample consisted of 30 javelin throwing athletes who were divided into two groups, namely the experimental group given a medicine ball-based training program and the control group that continued to undergo conventional training. The training is conducted for eight weeks with a frequency of three times a week. Data collection was carried out through practical tests of javelin throwing, measurement of arm and shoulder muscle strength using a dynamometer, and analysis of throwing techniques through video recording. The results showed that the experimental group experienced a significant increase in average throwing distance by 12.5%, an increase in muscle strength by 18%, and visual improvement in throwing technique. Based on these findings, it can be concluded that the medicine ball-based training model makes a positive contribution to improving the performance of javelin throwing athletes. Therefore, this model is recommended as an alternative to an innovative and effective training program in the development of athletic athletes.
Co-Authors Aditya Hani Aprizal Fikri Murniati . Priyono Suryanto Satria, M. Haris