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All Journal Habitat AGRIVITA, Journal of Agricultural Science AGROLAND: The Agricultural Sciences Journal Asia Pacific Journal of Sustainable Agriculture, Food and Energy (APJSAFE) AGROLAND: The Agricultural Sciences Journal
Paul Kristiansen
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Energy Environmental Science Other

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 1 
SOME WEED SPECIES AFFECTING SOYBEAN NODULATION AND NODULE FUNCTION Chaniago, Irawati; Taji, Acram; Kristiansen, Paul; Jessop, Robin
AGRIVITA, Journal of Agricultural Science Vol 34, No 2 (2012)
Publisher : Faculty of Agriculture University of Brawijaya and Indonesian Agronomic Assossiation

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Abstract

Experiments aimed at examining the effect of aqueous extracts of three weed species on nodulation and nodule function of soybean cv. Melrose have been carried out at the Laboratory of Plant Physiology and Biotechnology, Department of Agronomy and Soil Science, University of New England, Australia. Aqueous extracts of fresh weed material (Amaranthus powellii, Cyperus rotundus and Paspalum dilatatum) at the concentration of 10% (w/v) were added to a minus-nitrogen Hoagland’s nutrient solution in which the soybean plants were grown with 14 hours day length, day and night temperatures of 28 and 20°C, respectively, light intensity of 790 mmol/m2/s, and the relative humidity of 65%. The plants were kept for three weeks prior to the measurement of activity of nitrogenase enzyme and ammonium content of the root nodules. Results demonstrate that all weed extracts reduced the nodulation and nitrogenase activities (ARA) of soybean cv. Melrose. Amaranth was most inhibitory to nitrogenase enzyme activity. However, amaranth extract was less inhibitory than nutgrass extract in total ammonium content.
SOME WEED SPECIES AFFECTING SOYBEAN NODULATION AND NODULE FUNCTION Chaniago, Irawati; Taji, Acram; Kristiansen, Paul; Jessop, Robin
AGRIVITA, Journal of Agricultural Science Vol 34, No 2 (2012)
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v34i2.118

Abstract

Experiments aimed at examining the effect of aqueous extracts of three weed species on nodulation and nodule function of soybean cv. Melrose have been carried out at the Laboratory of Plant Physiology and Biotechnology, Department of Agronomy and Soil Science, University of New England, Australia. Aqueous extracts of fresh weed material (Amaranthus powellii, Cyperus rotundus and Paspalum dilatatum) at the concentration of 10% (w/v) were added to a minus-nitrogen Hoagland’s nutrient solution in which the soybean plants were grown with 14 hours day length, day and night temperatures of 28 and 20°C, respectively, light intensity of 790 mmol/m2/s, and the relative humidity of 65%. The plants were kept for three weeks prior to the measurement of activity of nitrogenase enzyme and ammonium content of the root nodules. Results demonstrate that all weed extracts reduced the nodulation and nitrogenase activities (ARA) of soybean cv. Melrose. Amaranth was most inhibitory to nitrogenase enzyme activity. However, amaranth extract was less inhibitory than nutgrass extract in total ammonium content.
EFFECT OF TWO SEAWEED PRODUCTS ON RADISH (RAPHANUS SATIVUS) GROWTH UNDER GREENHOUSE CONDITIONS Ramal Yusuf; Paul Kristiansen; Nigel Warwick
AGROLAND: The Agricultural Sciences Journal Vol 2, No 1 (2015)
Publisher : Tadulako University

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Abstract

Several studies have revealed a wide range of beneficial effects of seaweed products applications on plants growth and development. Seaweeds may cause different effect in plant responses because there are a range possible factors acting in concert. These factors may include to the amount of plant growth regulator (PGR) and nutrients present in the products. PGR activity in two seaweed products (Maxicrop® and Seasol®) was investigated using Radish (Raphanus sativus). Treatments included a control, standard concentrations of the seaweed Products (SS1 and MC1), 2 and 4 times the recommended rates (SS2, SS4, MC2 and MC4) ashed seaweed products (SS-ash and MC-ash), and equivalent amounts of N, P and K to that found in seaweed products (SS-NPK and MC-NPK). The results obtained show that both Maxicrop® and Seasol® can significantly increase crop performance. Maxicrop® increased chlorophyll content and root and shoot growth, while Seasol® only increased the chlorophyll content
EFFECT OF TWO SEAWEED PRODUCTS ON RADISH (RAPHANUS SATIVUS) GROWTH UNDER GREENHOUSE CONDITIONS Ramal Yusuf; Paul Kristiansen; Nigel Warwick
AGROLAND: The Agricultural Sciences Journal Vol 2, No 1 (2015)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Several studies have revealed a wide range of beneficial effects of seaweed products applications on plants growth and development. Seaweeds may cause different effect in plant responses because there are a range possible factors acting in concert. These factors may include to the amount of plant growth regulator (PGR) and nutrients present in the products. PGR activity in two seaweed products (Maxicrop® and Seasol®) was investigated using Radish (Raphanus sativus). Treatments included a control, standard concentrations of the seaweed Products (SS1 and MC1),    2 and 4 times the recommended rates (SS2, SS4, MC2 and MC4) ashed seaweed products (SS-ash and MC-ash), and equivalent amounts of N, P and K to that found in seaweed products (SS-NPK and MC-NPK). The results obtained show that both Maxicrop® and Seasol® can significantly increase crop performance. Maxicrop® increased chlorophyll content and root and shoot growth, while Seasol® only increased the chlorophyll content.   Key Words: Plant growth regulator, radish, seaweed.
BIOASSAY DEVELOPMENT USING PEA (Pisum sativum L.) Ramal Yusuf; Paul Kristiansen; Nigel Warwick
AGROLAND: The Agricultural Sciences Journal Vol 1, No 1 (2014)
Publisher : Tadulako University

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Abstract

The term bioassay is used to describe the use of living material to test the effect of known and putative biologically active substances. In places where advanced analytical equipment is not available, rapid screening using simple, affordable methods is needed. Seeds of Seeds of peas were germinated (Arditti and Dunn, 1969) and grown in the dark at 20°C for 2 days. Five pre-germinated seeds immersed in 30 mL solution containing test solutions of auxins (IBA), cytokinins (kinetin) and a gibberellin (GA3) all seeds were distributed at randomly to Petri dishes containing the test solution. Auxin activity peak was equivalent to 0.005 µM, while cytokinin activity peaked at 0.5 µM, and gibberellin at 0.5 to 5 µM based on root measurement.   KeyWords : Bioassay, elongation, Pea.
Bioassay Development Using Pea (Pisum sativum L.) Ramal Yusuf; Paul Kristiansen; Nigel Warwick
AGROLAND The Agricultural Sciences Journal (e-Journal) Vol 1 No 1 (2014): June
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/agroland.v1i1.288

Abstract

The term bioassay is used to describe the use of living material to test the effect of known and putative biologically active substances. In places where advanced analytical equipment is not available, rapid screening using simple, affordable methods is needed. Seeds of Seeds of peas were germinated (Arditti and Dunn, 1969) and grown in the dark at 20°C for 2 days. Five pre-germinated seeds immersed in 30 mL solution containing test solutions of auxins (IBA), cytokinins (kinetin) and a gibberellin (GA3) all seeds were distributed at randomly to Petri dishes containing the test solution. Auxin activity peak was equivalent to 0.005 µM, while cytokinin activity peaked at 0.5 µM, and gibberellin at 0.5 to 5 µM based on root measurement.
Effect of Two Seaweed Products on Radish (Raphanus sativus) Growth Under Greenhouse Conditions Ramal Yusuf; Paul Kristiansen; Nigel Warwick
AGROLAND The Agricultural Sciences Journal (e-Journal) Vol 2 No 1 (2015): June
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/agroland.v2i1.333

Abstract

Several studies have revealed a wide range of beneficial effects of seaweed products applications on plants growth and development. Seaweeds may cause different effect in plant responses because there are a range possible factors acting in concert. These factors may include to the amount of plant growth regulator (PGR) and nutrients present in the products. PGR activity in two seaweed products (Maxicrop® and Seasol®) was investigated using Radish (Raphanus sativus). Treatments included a control, standard concentrations of the seaweed Products (SS1 and MC1), 2 and 4 times the recommended rates (SS2, SS4, MC2 and MC4) ashed seaweed products (SS-ash and MC-ash), and equivalent amounts of N, P and K to that found in seaweed products (SS-NPK and MC-NPK). The results obtained show that both Maxicrop® and Seasol® can significantly increase crop performance. Maxicrop® increased chlorophyll content and root and shoot growth, while Seasol® only increased the chlorophyll content.
Water management and irrigation for bulb onion (Allium cepa L.) growth and development in the Papua New Guinea Highlands Aku, Rodney; Kristiansen, Paul; Coleman, Michael
Asia Pacific Journal of Sustainable Agriculture, Food and Energy Vol. 11 No. 2 (2023): December 2023
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy Network (SAFE Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36782/apjsafe.v11i2.251

Abstract

Water is crucial for nutrient intake, transportation, temperature regulation, and photosynthesis in bulb onion (Allium cepa L.) growth and development. Water scarcity, caused by climate variability and particularly during prolonged dry periods, has proved to be an obstacle to cultivating bulb onions in the Papua New Guinea (PNG) Highlands. Farmers have a limited grasp of the interdependence of soil, water, and plants. They have traditionally depended on precipitation, and water from streams and rivers, to irrigate their bulb onion crops. The main method for providing irrigation support is manual irrigation, with agricultural organisations assisting with basic irrigation technologies. Despite farmers and organisations efforts to improve irrigation practices, the prolonged dry season still raises labour demands for bulb onion farms. Farmers’ lack of knowledge about irrigation technology and soil water conservation contributes to this issue. Moreover, the lack of irrigation suppliers worsens the issue of limited soil water in onion farms. This paper gives an overview of onion production in PNG, focusing on irrigation practices and constraints in the Highlands region. It aims to stress irrigation’s importance in crop growth and explore PNG’s irrigation methods and soil moisture conservation practices. There is a need for a sustainable irrigation and soil water conservation system that is easy to use and incorporates crop water requirements. This system is vital for watering onions and conserving soil moisture, promoting their growth and yield. In this context, the use of mulch and irrigation systems can preserve and enhance soil moisture during prolonged dry phases.
The Analysis of Society Preferences in Using MALFARMS Metaverse Application to Support Green and Sustainable Agriculture Prasetyaningrum, Dian Islami; Maulidan, Mohamad; Yuswita, Effy; Kristiansen, Paul
HABITAT Vol. 36 No. 1 (2025): April
Publisher : Department of Social Economy, Faculty of Agriculture , University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.habitat.2025.036.1.6

Abstract

MALFARMS application itself is one example of technology implementation in the context of modern agriculture. MALFARMS is an agricultural optimization innovation through the metaverse concept based on Android Integrated Augmented Reality Technology. The optimization of farming activities through the provision of e-commerce plays a vital role in agricultural marketing. MALFARMS can also help optimize the agricultural process to minimize adverse environmental impacts. This study aims to analyze people's preferences for the MALFARMS application, describe what features support the MALFARMS application, and explore the MALFARMS application to achieve green marketing. The research method uses a quantitative approach with data analysis used in this study using Discrete Choice Experiment (DCE) Analysis. The DCE method was chosen because it considers other alternatives in the choice set in the MALFARMS feature. The research was conducted in Malang City, Malang Regency, and Batu City. Public preference for the MALFARMS application based on the results of conditional logit analysis shows that the MALFARMS application on product advertisements on the application display and innovative application display has a more excellent utility value than the application display with attractive application design, which is 0.892 and 0.701 respectively. The results of the conditional logit analysis of products labeled as non-organic and without claims have a more excellent utility value than organic products, which are 0.570 and 0.120, respectively. The results of the conditional logit analysis on E-Money and COD have a more excellent utility value than bank transfers, which are 0.492 and 0.504, respectively.
Co-Authors Acram Taji Acram Taji Aku, Rodney Coleman, Michael Irawati Chaniago Maulidan, Mohamad Nigel Warwick Prasetyaningrum, Dian Islami Ramal Yusuf Robin Jessop Yuswita, Effy