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Articles by Denny Kurniadie
Total Records ( 3 ) for Denny Kurniadie
  Yayan Sumekar , Denny Kurniadie , Dedi Widayat and Anni Yuniarti
  Background and Objective: Metsulfuron-methyl is a pre and post-emergence herbicide that can control weeds in lowland rice cultivation, but the level of persistence is not certain. This study aimed to examine the effect of giving organic matter and the dose of the herbicide Metsulfuron-methyl to weeds, rice growth and yield, as well as to determine the level of persistence. Materials and Methods: The trial started from January-June, 2018 which was carried out in the Rice Fields of Cinunuk Village, Cileunyi District, Bandung Regency. The experiment used a bi-factor and was carried out using a divided plot design which was repeated three times, the main plot factor was the organic matter, consisting of two levels, namely: Low C-organic content (1.86%) and High organic C content (3.5%), while, subplot factor is the dose Metsulfuron-methyl herbicide, consisting of 5 levels: No herbicide, Metsulfuron-methyl dose 0.0010 kg a.i. ha–1, Metsulfuron-methyl dose 0.0020 kg a.i. ha–1, Metsulfuron-methyl dose 0.0030 kg a.i. ha–1 and Metsulfuron-methyl dose 0.0040 kg a.i. ha–1. Results: The results showed that the treatment of Metsulfuron-methyl herbicide from a dose of 0.0010 kg a.i. ha–1 to a dose of 0.0040 kg a.i. ha–1 could increase the growth and yield of rice plants. The persistence of the Metsulfuron-methyl herbicide starting at a dose of 0.0010-0.0040 kg a.i. ha–1at each C-organic content showed a value of 0 on observations 90 days after application. Conclusion: The increase in C-organic content in the soil caused a decrease in the persistence of the Metsulfuron-methyl herbicide.
  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.
  Yayan Sumekar , Denny Kurniadie , Uum Umiyati , Dedi Widayat and Syariful Mubarok
  Background and Objectives: The existence of weeds on potato crops could decrease the productivity of the crops, so that weed control efforts were absolutely necessary. The diversity of dominant weed types needed to be known so that weed control could be done correctly. This study aimed to make dominant weed mapping on potato cultivation in Garut regency. Materials and Methods: This research was conducted using the quadratic method. Two locations of potato plant areas as samples scattered at different altitude or topographic conditions were randomly selected in each sub-district. At each location the sample was weighed diagonally (5 times) for each plot of potato cropping using the iron squares of size 0.5×0.5 m. Field data was used to determine weed species, weed density, weed frequency, weed domination, importance value, summed dominance ratio, weed dry weight and species diversity index. Results: The results showed that the dominant weed species in Cisurupan, Pasirwangi, Cikajang and Cigedug Sub-districts were Galinosoga parviflora (29.66%), Amaranthus spinosus (34.62%), Drymaria vilosa (22.72%) and Cyperus rotundus (21,26%), respectively. The value of diversity index of potato crop acquired in Garut regency ranged from 1.46-2.26 including low-moderate. Conclusion: This study concluded that weeds in highland potato cultivation in Garut regency were dominated by broad-leaved weeds.
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