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Articles by Sudarjat
Total Records ( 3 ) for Sudarjat
  Sudarjat , Andra Leovika , Erni Suminar , Vijaya Isnaniawardhani , Muhamad Abdilah Hasan Qanit , Ardika Albi Fauzi and Syariful Mubarok
  Background and Objective: Dragon fruit is a popular cultivated fruit in Indonesia because of its nutritional value. Recently, farmers have begun to cultivate coloured varieties of dragon fruit such as yellow (Hylocereus megalanthus), red (H. polyrhizus), orange and black (H. Hybrid). However, the morphological characters of these varieties are yet to be elucidated. The objective of this study was to evaluate the morphological characters of four coloured dragon fruit varieties. Materials and Methods: Four dragon fruit genotypes (Hylocereus megalanthus, H. polyrhizus and two H. Hybrid) were cultivated in Pangandaran regency of Indonesia with an altitude of 10 m above sea level with the minimum and maximum temperature of 24 and 37°C, respectively. The experiment was conducted from November, 2017 to September, 2018. About 75 individual plants for each genotype were cultivated. Parameters related to plant growth such as growth rate, stem height, number of shoot and also plant phenotype were recorded during plant growth and development. Results: The result showed that the four dragon fruit genotypes each have different characterizations. The red variety has the best growth condition, while the yellow variety exhibited the lowest growth rate. Conclusion: This study concluded that the red variety is more suitable and adaptable to be cultivated in Pangandaran.
  Sudarjat , Vijaya Isnaniawardhani and and Syariful Mubarok
  Background and Objective: Plant propagation is one the important factors in plant and fruit production. Many problems have been arisen in dragon fruit propagation, such as the yellowing and the rooting inability of cuttings. To solve this problem, the understanding how to choose suitable growing media is needed. This study was conducted to investigate the effects of different growing media compositions on dragon fruit propagation. Materials and Methods: The experiment was conducted in Green House, Faculty of Agriculture, Universitas Padjadjaran from June to September, 2017. Six growing media compositions were used for two species of dragon fruit (H. undatus and H. polyrhizus): soil (v), soil+sand (1:1/v:v), soil+compost (1:1/v:v), soil+vermicompost (1:1/v:v), soil+sand+compost (1:1:1/v:v:v) and soil+sand+vermicompost (1:1:1/v:v:v). Results: The results showed that soil+vermicompost (1:1/v:v) and soil+sand+compost (1:1:1/v:v:v) gave the best growth results for the two dragon fruit species by increasing the number of shoots and the lengths of the shoots. Conclusion: It was concluded that vermicompost was better growing media than compost for propagating dragon fruit by cuttings.
  Denny Kurniadie , Maulydina Irda , Uum Umiyati , Dedi Widayat , Sudarjat and Ceppy Nasahi
  Background and Objective: Lowland rice (Oryza sativa L.) is the staple food for most of Indonesian. Weed an important constraints in increasing rice production in Indonesia that has to be overcome. Weeds reduce the crop yield due to compete with light absorption, oxygen, CO2, space and nutrients. This study aimed to find out the weeds diversity in organic and conventional rice farming system in Purwakarta Regency west Java Indonesia. Materials and Methods: The materials used in this research were land map and questionnaire. The tools used in this research were squared meter (1.0×1.0 m), gauge, scissors, plastic bag, label paper, analytical scales and dryer oven. The method used was qualitative method (weed survey by giving questionnaires to farmers) and quantitative method by using vegetation analysis. This research was conducted from December, 2017 to February, 2018. Results: The vegetation analysis showed that weed diversity on conventional farming system consist of 3 species of grasses, 1 species of sedges and 5 species of broad leaf, whereas in organic farming system consist 2 species of grasses, 1 species of sedges and 4 species of broad leaf. Weeds with the highest SDR (Summed Dominance Ratio) value in both conventional and organic farming system is Fimbristylis miliacea. Conclusions: Weed population in conventional and organic farming system was different. This study can be useful to determine an effective and efficient post emergent wed management strategy for the following season.
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